Revision history for Verilator

The contributors that suggested a given feature are shown in []. Thanks!

* Verilator 4.014 2019-05-08

***   Add --trace-fst-thread.

****  Support '#' comments in $readmem, bug1411. [Frederick Requin]

****  Support "'dx" constants, bug1423. [Udi Finkelstein]

****  For FST tracing use LZ4 compression. [Tony Bybell]

****  Add error when use parameters without value, bug1424. [Peter Gerst]

****  Auto-extend and WIDTH warn on unsized X/Zs, bug1423. [Udi Finkelstein]

****  Fix missing VL_SHIFTL_ errors, bug1412, bug1415. [Larry Lee]

****  Fix MinGW GCC 6 printf formats, bug1413. [Sergey Kvachonok]

****  Fix test problems when missing fst2vcd, bug1417. [Todd Strader]

****  Fix GTKWave register warning, bug1421. [Pieter Kapsenberg]

****  Fix FST enums not displaying, bug1426. [Danilo Ramos]

****  Fix table compile error with multiinterfaces, bug1431. [Bogdan Vukobratovic]


* Verilator 4.012 2019-3-23

***   Add +verilator+seed, bug1396. [Stan Sokorac]

***   Support $fread.  [Leendert van Doorn]

***   Support void' cast on functions called as tasks, bug1383. [Al Grant]

***   Add IGNOREDRETURN warning, bug1383.

****  Report PORTSHORT errors on concat constants, bug 1400. [Will Korteland]

****  Fix VERILATOR_GDB being ignored, msg2860. [Yu Sheng Lin]

****  Fix $value$plus$args missing verilated_heavy.h. [Yi-Chung Chen]

****  Fix MSVC compile error, bug1406. [Benjamin Gartner]

****  Fix maintainer test when no Parallel::Forker, msg2630. [Enzo Chi]

****  Fix +1364-1995ext flags applying too late, bug1384. [Al Grant]


* Verilator 4.010 2019-01-27

***   Removed --trace-lxt2, use --trace-fst instead.

****  For --xml, add additional information, bug1372. [Jonathan Kimmitt]

****  Add circular typedef error, bug1388.  [Al Grant]

****  Add unsupported for loops error, msg2692. [Yu Sheng Lin]

****  Fix FST tracing of wide arrays, bug1376. [Aleksander Osman]

****  Fix error when pattern assignment has too few elements, bug1378. [Viktor Tomov]

****  Fix error when no modules in $unit, bug1381. [Al Grant]

****  Fix missing too many digits warning, bug1380. [Jonathan Kimmitt]

****  Fix uninitialized data in verFiles and unroller, bug1385. bug1386. [Al Grant]

****  Fix internal error on xrefs into unrolled functions, bug1387. [Al Grant]

****  Fix DPI export void compiler error, bug1391. [Stan Sokorac]


* Verilator 4.008 2018-12-01

***   Support "ref" and "const ref" pins and functions, bug1360. [Jake Longo]

***   In --xml-only show the original unmodified names, and add module_files
      and cells similar to Verilog-Perl, msg2719. [Kanad Kanhere]

****  Add CONTASSREG error on continuous assignments to regs, bug1369. [Peter Gerst]

****  Add PROCASSWIRE error on behavioral assignments to wires, msg2737. [Neil Turton]

****  Add IMPORTSTAR warning on import::* inside $unit scope.

****  Fix --trace-lxt2 compile error on MinGW, msg2711. [HyungKi Jeong]

****  Fix hang on bad pattern keys, bug1364. [Matt Myers]

****  Fix crash due to cygwin bug in getline, bug1349. [Affe Mao]

****  Fix __Slow files getting compiled with OPT_FAST, bug1370. [Thomas Watts]


* Verilator 4.006 2018-10-27

**    Add --pp-comments, msg2700. [Robert Henry]

**    Add --dump-defines.

***   For --trace-fst, save enum decoding information, bug1358. [Sergi Granell]
      (To visualize enumeration data you must use GTKwave 3.3.95 or newer.)

***   For --trace-fst, instead of *.fst.hier, put data into *.fst. [Tony Bybell]

****  Fix --trace-lxt2 compile error on MinGW, msg2667. [HyungKi Jeong]

****  Fix Windows .exe not found, bug1361. [Patrick Stewart]


* Verilator 4.004 2018-10-6

**    Add GTKWave FST native tracing, bug1356. [Sergi Granell]
      (Verilator developers need to pull the latest vcddiff.)

***   Support $past. [Dan Gisselquist]

***   Support restrict, bug1350. [Clifford Wolf]

***   Rename include/lxt2 to include/gtkwave.

****  Fix replication of 64-bit signal change detects.

****  Fix Mac OSX 10.13.6 / LLVM 9.1 compile issues, bug1348. [Kevin Kiningham]

****  Fix MinGW compile issues, msg2636. [HyungKi Jeong]


* Verilator 4.002 2018-09-16

**    This is a major release.  Any patches may require major rework to apply.
      [Thanks everyone]

**    Add multithreaded model generation.

**    Add runtime arguments.

**    Add GTKWave LXT2 native tracing, bug1333. [Yu Sheng Lin]

**    Note $random has new algorithm; results may vary vs. previous versions.

***   Better optimize large always block splitting, bug1244. [John Coiner]

***   Add new reloop optimization for repetitive assignment compression.

***   Support string.atoi and similar methods, bug1289. [Joel Holdsworth]

****  Fix internals to be C++ null-pointer-check clean.

****  Fix internals to avoid 'using namespace std'.

****  Fix Verilation performance issues, bug1316. [John Coiner]

****  Fix clocker attributes to not propagate on concats. [John Coiner]

****  Fix first clock edge and --x-initial-edge, bug1327. [Rupert Swarbrick]

****  Fix compile error on tracing of string arrays, bug1338. [Iztok Jeras]

****  Fix number parsing with newline after radix, bug1340. [George Cuan]

****  Fix string ?: conditional type resolution, bug1345. [Iztok Jeras]

****  Fix duplicate symbol error on generate tri, bug1347. [Tomas Dzetkulic]


* Verilator 3.926 2018-08-22

****  Add OBJCACHE envvar support to examples and generated Makefiles.

****  Change MODDUP errors to warnings, msg2588. [Marshal Qiao]

****  Fix define argument stringification (`"), broke since 3.914. [Joe DErrico]

****  Fix to ignore Unicode UTF-8 BOM sequences, msg2576. [HyungKi Jeong]

****  Fix std:: build error, bug1322.

****  Fix function inlining inside certain while loops, bug1330. [Julien Margetts]


* Verilator 3.924 2018-06-12

***   Renamed --profile-cfuncs to --prof-cfuncs.

****  Report interface ports connected to wrong interface, bug1294. [Todd Strader]

****  When tracing, use scalars on single bit arrays to appease vcddiff.

****  Fix parsing "output signed" in V2K port list, msg2540. [James Jung]

****  Fix parsing error on bad missing #, bug1308. [Dan Kirkham]

****  Fix $clog2 to be in verilog 2005, bug1319. [James Hutchinson]


* Verilator 3.922 2018-03-17

**    Support IEEE 1800-2017 as default language.

***   Support trig functions ($sin() etc), bug1281. [Patrick Stewart]

***   Support calling system functions as tasks, bug1285. [Joel Holdsworth]

***   Support assert properties, bug785, bug1290. [John Coiner, et al]

***   Support $writememh. [John Coiner]

***   Add --no-debug-leak to reduce memory use under debug. [John Coiner]

****  Fix severe runtime performance bug in certain foreach loops. [John Coiner]

****  On convergence errors, show activity. [John Coiner]

****  Fix GCC 8.0 issues, bug1273.

****  Fix pullup/pulldowns on bit selects, bug1274. [Rob Stoddard]

****  Fix verilator_coverage --annotate-min, bug1284. [Tymoteusz Blazejczyk]

****  Fix quoting of quoted arguments. [John Coiner]


* Verilator 3.920 2018-02-01

**    Moving forward, use the git "stable" branch to track the latest release,
      and git "v#.###" tags for specific releases.

***   Support 'assume' similar to 'assert', bug1269. [Dan Gisselquist]

****  Fix tracing example file output, bug1268. [Enzo Chi]

****  Fix gate optimization out of memory, add --gate-stmts, bug1260. [Alex Solomatnikov]

****  Fix compile error on public real parameters by suppressing, bug1261. [Alex Solomatnikov]

****  Fix input-only tristate comparisons, bug1267. [Alexis G]

****  Fix missing edge type in xml output, msg2480. [Alexis G]

****  Fix compile error with --public and interface bind, bug1264. [Alexis G]

****  Remove c++filt, bug1265. [Stefan Wallentowitz]


* Verilator 3.918 2018-01-02

***   Workaround GCC/clang bug with huge compile times, bug1248.

***   Support DPI open arrays, bug909, bug1245. [David Pierce, Victor Besyakov]

***   Add INFINITELOOP warning, bug1254. [Alex Solomatnikov]

****  Support > 64 bit decimal $display.

****  Support DPI time and svLogicVal. [Victor Besyakov]
      Note older version incorrectly assumed svBitVal even for logicals.

****  Support string len() method. [Victor Besyakov]

****  Add error if always_comb has sensitivity list. [Arjen Roodselaar]

****  Fix SystemC 2.3.2 compile error, bug1251. [Tymoteusz Blazejczyk]

****  Fix modport outputs being treated as inputs, bug1246. [Jeff Bush]

****  Fix false ALWCOMBORDER on interface references, bug1247. [Josh Redford]

****  Fix constant propagation across DPI imports of inout strings. [Victor Besyakov]

****  Fix resolving inline nested interface names, bug1250. [Arjen Roodselaar]


* Verilator 3.916 2017-11-25

***   Support self-recursive modules, bug659. [Sean Moore, et al]

***   Support $error/$warning in elaboration time blocks.

***   Support $size/$bits/etc on type references.

***   Add error when driving input-only modport, bug1110. [Trevor Elbourne]

***   Add BSSPACE and COLONPLUS lint warnings.

****  Detect MSB overflow when under VL_DEBUG, bug1238. [Junyi Xi]

****  Add data types to --xml. [Rui Terra]

****  Fix partial slicing with pattern assignments, bug991. [Johan Bjork]

****  Fix false unused warning on interfaces, bug1241. [Laurens van Dam]

****  Fix error on "unique case" with no cases.

****  Fix MacOS portability, bug1232. [Jeff Bush]


* Verilator 3.914 2017-10-14

**    Added new examples/ directory with appropriate examples. This replaces the
      old test_c and test_sc directories.

***   Add --getenv option for simplifying Makefiles.

***   Add --x-initial option for specifying initial value assignment behavior.

***   Add --no-relative-cfuncs and related default optimization, bug1224. [John Coiner]

***   Add /*verilator tag*/ for XML extraction applications. [Chris Randall]

****  The internal test_verilated test directory is moved to be part of test_regress.

****  The experimental VL_THREADED setting (only, not normal mode) now requires C++11.

****  Fix over-aggressive inlining, bug1223. [John Coiner]

****  Fix Ubuntu 17.10 issues, bug1223 partial. [John Coiner]

****  Fix compiler warning when WIDTH warning ignored on large compare.

****  Fix memory leak in VerilatedVcd dumps, bug1222 partial. [Shareef Jalloq]

****  Fix unnecessary Vdly variables, bug1224 partial. [John Coiner]

****  Fix conditional slices and add related optimizations.

****  Fix `` expansion of `defines, bug1225, bug1227, bug1228. [Odd Magne Reitan]

****  Fix -E duplicating output, bug1226. [Odd Magne Reitan]

****  Fix float-conversion warning, bug1229. [Robert Henry]

****  Fix MacOS portability, bug1230, bug1231. [Jeff Bush]


* Verilator 3.912 2017-09-23

**    Verilated headers no longer "use namespace std;"
      User's code without "std::" prefixes may need "use namespace std;" to compile.

***   Support or/and/xor array intrinsic methods, bug1210. [Mike Popoloski]

***   Support package export, bug1217. [Usuario Eda]

***   Fix ordering of arrayed cell wide connections, bug1202 partial. [Mike Popoloski]

****  Support module port parameters without defaults, bug 1213. [Mike Popoloski]

****  Add performance information to --stats file.

****  Simplify VL_CONST_W macro generation for faster compiles.

****  Fix LITENDIAN warning on arrayed cells, bug1202. [Mike Popoloski]

****  Fix enum ranges without colons, bug1204. [Mike Popoloski]

****  Fix GCC noreturn compile error, bug1209. [Mike Popoloski]

****  Fix constant function default parameters, bug1211. [Mike Popoloski]

****  Fix non-colon array of interface modports, bug1212. [Mike Popoloski]

****  Fix .name connections on interfaces, bug1214. [Mike Popoloski]

****  Fix wide array indices causing compile error.

****  Better optimize Shift-And, and replication constructs.


* Verilator 3.910 2017-09-07

***   SystemPerl mode (-sp-deprecated) has been removed.

****  Update keyword warnings to include C++11 and others.


* Verilator 3.908 2017-08-28

****  Support x in $readmem, bug1180. [Arthur Kahlich]

****  Support packed struct DPI imports, bug1190. [Rob Stoddard]

****  Fix GCC 6 warnings.

****  Fix compile error on unused VL_VALUEPLUSARGS_IW, bug1181. [Thomas J Whatson]

****  Fix undefined VL_POW_WWI. [Clifford Wolf]

****  Fix internal error on unconnected inouts, bug1187. [Rob Stoddard]


* Verilator 3.906 2017-06-22

***   Support set_time_unit/set_time_precision in C traces, msg2261.

***   Fix extract of packed array with non-zero LSB, bug1172. [James Pallister]

***   Fix shifts by more than 32-bit numbers, bug1174. [Clifford Wolf]

***   Fix power operator on wide constants, bug761. [Clifford Wolf]

***   Fix .* on interface pins, bug1176. [Maciej Piechotka]


* Verilator 3.904 2017-05-30

***   Fix non-cutable ordering loops on clock arrays, bug1009. [Todd Strader]

***   Support ports of array of reals, bug1154. [J Briquet]

***   Support arrayed parameter overrides, bug1153. [John Stevenson]

***   Support $value$plusargs with variables, bug1165. [Wesley Terpstra]

****  Support modport access to un-modport objects, bug1161. [Todd Strader]

****  Add stack trace when can't optimize function, bug1158. [Todd Strader]

****  Add warning on mis-sized literal, bug1156. [Todd Strader]

****  Fix interface functions returning wrong parameters, bug996. [Todd Strader]

****  Fix non-arrayed cells with interface arrays, bug1153. [John Stevenson]

****  Fix --assert with complex case statements, bug1164. [Enzo Chi]


* Verilator 3.902 2017-04-02

**    Add -FI option to force includes,msg2146. [Amir Gonnen]

**    Add --relative-includes. [Rob Stoddard]

***   Add error on duplicate pattern assignments, bug1145. [Johan Bjork]

****  Fix error on improperly widthed default function, bug984. [Todd Strader]

****  Fix 2009 localparam syntax, msg2139. [Galen Seitz]

****  Fix ugly interface-to-non-interface errors, bug1112. [Johan Bjork]

****  Fix LDFLAGS and CFLAGS not preserving order, bug1130. [Olof Kindgren]

****  Fix internal error on initializing parameter array, bug1131. [Jie Xu]

****  Fix internal error on interface arrays, bug1135. [John Stevenson]

****  Fix calling sformatf to display, and elab $displays, bug1139. [Johan Bjork]

****  Fix realpath compile issue on MSVC++, bug1141. [Miodrag Milanovic]

****  Fix missing error on interface size mismatch, bug1143.  [Johan Bjork]

****  Fix error on parameters with dotted references, bug1146. [Johan Bjork]

****  Fix wreal not handling continuous assign, bug1150. [J Briquet]

****  Fix nested structure parameter selects, bug1150. [J Briquet]


* Verilator 3.900 2017-01-15

**    Internal code changes for improved compatibility and performance.

***   Support old-style $display($time), bug467. [John Demme]

****  With --bbox-unsup, suppress desassign and mixed edges, bug1120. [Galen Seitz]

****  Fix parsing sensitivity with &&, bug934. [Luke Yang]

****  Fix internal error on double-for loop unrolling, bug1044. [Jan Egil Ruud]

****  Fix internal error on unique casez with --assert, bug1117. [Enzo Chi]

****  Fix bad code when tracing array of structs, bug1122. [Andrew Bardsley]


* Verilator 3.890 2016-11-25

***   Honor --output-split on coverage constructors, bug1098. [Johan Bjork]

****  Fix various issues when making outside of the kit.

****  Fix flex 2.6.2 bug, bug1103. [Sergey Kvachonok]

****  Fix error on bad interface name, bug1097. [Todd Strader]

****  Fix error on referencing variable in parent, bug1099. [Ian Thompson]

****  Fix type parameters with low optimization, bug1101. [Stefan Wallentowitz]


* Verilator 3.888 2016-10-14

**    Support foreach, bug1078. [Xuan Guo]

***   Add --no-decoration to remove output comments, msg2015. [Frederic Requin]

***   If VM_PARALLEL_BUILDS=1, use OPT_FAST and OPT_SLOW. [Frederic Requin]
      Set VM_DEFAULT_RULES=0 for old behavior.

****  Add error on DPI functions > 32 bits, msg1995. [Elliot Mednick]

****  Fix SystemC compiles with VPI, bug1081. [Arthur Kahlich]

****  Fix error on wide numbers that represent shifts, msg1991, bug1088. [Mandy Xu]

****  Improve Verilation performance on internal strings, msg1975. [Johan Bjork]

****  Improve Verilation performance on trace duplicates, bug1090. [Johan Bjork]


* Verilator 3.886 2016-07-30

****  Fix enum values of 11-16 bits wide using .next/.prev, bug1062. [Brian Flachs]

****  Fix false warnings on non-power-2 enums using .next/.prev.

****  Fix comparison of unpacked arrays, bug1071. [Andrew Bardsley]

****  Fix compiler warning in GCC 6. [David Horton]


* Verilator 3.884 2016-05-18

**    Support parameter type, bug376. [Alan Hunter, et al]

**    Support command-line -G/+pvalue param overrides, bug1045. [Stefan Wallentowitz]

***   The default l2 scope name is now the same as the top-level module, bug1050.
      Use "--l2-name v" for the historical behavior.

***   Add --l2-name option for controlling "v" naming.

****  Fix --output-split of constructors, bug1035. [Johan Bjork]

****  Fix removal of empty packages, modules and cells, bug1034. [Johan Bjork]

****  Fix core dump on Arch Linux/GCC 6.1.1, bug1058. [Jannis Harder]

****  Fix $value$plusargs to string, msg1890. [Frederic Requin]


* Verilator 3.882 2016-03-01

****  Internal Verilation-time performance enhancements, bug1021. [Johan Bjork]

****  Support inlining interfaces, bug1018. [Johan Bjork]

****  Support SV strings to readmemh, bug1040. [Stefan Wallentowitz]

****  Fix unrolling complicated for-loop bounds, bug677. [Johan Bjork]

****  Fix stats file containing multiple unroll entries, bug1020. [Johan Bjork]

****  Fix using short parameter names on negative params, bug1022. [Duraid Madina]

****  Fix read-after-free error, bug1031. [Johan Bjork]

****  Fix elaboration-time display warnings, bug1032. [Johan Bjork]

****  Fix crash on very deep function trees, bug1028. [Jonathan Kimmitt]

****  Fix slicing mix of big and little-endian, bug1033. [Geoff Barrett]

****  Fix pattern assignment width propagation, bug1037. [Johan Bjork]


* Verilator 3.880 2015-12-19

***   Support display %u, %v, %p, %z, bug989. [Johan Bjork]

****  Fix real parameters causing bad module names, bug992. [Johan Bjork]

****  Fix size-changing cast on packed struct, bug993. [Johan Bjork]

****  Fix function calls on arrayed interface, bug994. [Johan Bjork]

****  Fix arrayed interfaces, bug879, bug1001. [Todd Strader]

****  Fix constant function assigned to packed structs, bug997. [Johan Bjork]

****  Fix interface inside generate, bug998. [Johan Bjork]

****  Fix $signed casts under generates, bug999. [Clifford Wolf]

****  Fix genvar constant propagation, bug1003. [Johan Bjork]

****  Fix parameter constant propagation from package, bug1004. [Johan Bjork]

****  Fix array slicing of non-const indexes, bug1006. [Johan Bjork]

****  Fix dotted generated array error, bug1005. [Jeff Bush, Johan Bjork]

****  Fix error instead of warning on large concat, msg1768. [Paul Rolfe]

****  Fix $bitstoreal constant propagation, bug1012. [Jonathan Kimmitt]

****  Fix model restore crash, bug1013. [Jason McMullan]

****  Fix arrayed instances to unpacked of same size, bug1015. [Varun Koyyalagunta]

****  Fix slices of unpacked arrays with non-zero LSBs.

****  Fix ternary operation with unpacked array, bug1017. [Varun Koyyalagunta].


* Verilator 3.878 2015-11-01

**    Add --vpi flag, and fix VPI linkage, bug969. [Arthur Kahlich]

**    Support genvar indexes into arrayed cells, bug517.  [Todd Strader]

**    Support $sformatf, bug977. [Johan Bjork]

***   Support elaboration assertions, bug973. [Johan Bjork]

***   Support $display with non-format arguments, bug467. [Jamey Hicks]

****  Add VerilatedScopeNameMap for introspection, bug966. [Todd Strader]

****  Ignore %l in $display, bug983. [Todd Strader]

****  Fix very long module names, bug937. [Todd Strader]

****  Fix internal error on dotted refs into generates, bug958. [Jie Xu]

****  Fix structure parameter constant propagation, bug968. [Todd Strader]

****  Fix enum constant propagation, bug970. [Todd Strader]

****  Fix mis-optimizing public DPI functions, bug963. [Wei Song]

****  Fix package:scope.scope variable references.

****  Fix $fwrite to constant stderr/stdout, bug961. [Wei Song]

****  Fix struct.enum.name method calls, bug855. [Jonathon Donaldson]

****  Fix dot indexing into arrayed inferfaces, bug978.  [Johan Bjork]

****  Fix crash in commandArgsPlusMatch, bug987. [Jamie Iles]

****  Fix error message on missing interface, bug985. [Todd Strader]


* Verilator 3.876 2015-08-12

***   Add tracing_on, etc to vlt files, bug932. [Frederic Requin]

****  Support extraction of enum bits, bug951. [Jonathon Donaldson]

****  Fix MinGW compiler error, bug927, bug929. [Hans Tichelaar]

****  Fix .c files to be treated as .cpp, bug930. [Jonathon Donaldson]

****  Fix string-to-int space conversion, bug931. [Fabrizio Ferrandi]

****  Fix dpi imports inside generates. [Michael Tresidder]

****  Fix rounding in trace $timescale, bug946. [Frederic Requin]

****  Fix $fopen with SV string, bug947. [Sven Stucki]

****  Fix hashed error with typedef inside block, bug948. [Sven Stucki]

****  Fix makefile with --coverage, bug953. [Eivind Liland]

****  Fix coverage documentation, bug954. [Thomas J Whatson]

****  Fix parameters with function parameter arguments, bug952. [Jie Xu]

****  Fix size casts as second argument of cast item, bug950. [Jonathon Donaldson]


* Verilator 3.874 2015-06-06

***   Add pkg-config .pc file, bug919. [Stefan Wallentowitz]

****  Fix installing missing manpages, bug908. [Ahmed El-Mahmoudy]

****  Fix sign extension in large localparams, bug910. [Mike Thyer]

****  Fix core dump in sync-async warnings, bug911. [Sebastian Dressler]

****  Fix truncation warning with -pins-bv, bug912. [Alfonso Martinez]

****  Fix Cygwin uint32 compile, bug914. [Matthew Barr]

****  Fix preprocessing stringified newline escapes, bug915. [Anton Rapp]

****  Fix part-select in constant function, bug916. [Andrew Bardsley]

****  Fix width extension on mis-width ports, bug918. [Patrick Maupin]

****  Fix width propagation on sized casts, bug925. [Jonathon Donaldson]

****  Fix MSVC++ compiler error, bug927. [Hans Tichelaar]


* Verilator 3.872 2015-04-05

***   Add VerilatedVcdFile to allow real-time waveforms, bug890. [HyungKi Jeong]

***   Add --clk and related optimizations, msg1533. [Jie Xu]

***   Fix order of C style arrays. [Duraid Madina]

****  Add --dump-treei-<srcfile>, bug894. [Jie Xu]

****  Fix comma-instantiations with parameters, bug884. [Franck Jullien]

****  Fix SystemC arrayed bit vectors, bug886. [David Poole]

****  Fix compile error on MinGW, bug887. [HyungKi Jeong]


* Verilator 3.870 2015-02-12

****  Suppress COMBDLY when inside always_latch, bug864. [Iztok Jeras]

****  Support cast operator with expression size, bug865. [Iztok Jeras]

****  Add warning on slice selection out of bounds, bug875. [Cong Van Nguyen].

****  Fix member select error broke in 3.868, bug867. [Iztok Jeras]

****  Fix $sccanf from string, bug866. [David Pierce]

****  Fix VM_PARALLEL_BUILDS broke in 3.868, bug870. [Hiroki Honda]

****  Fix non-ANSI modport instantiations, bug868. [Kevin Thompson]

****  Fix UNOPTFLAT change detect on multidim arrays, bug872. [Andrew Bardsley]

****  Fix slice connections of arrays to ports, bug880. [Varun Koyyalagunta]

****  Fix mis-optimizing gate assignments in unopt blocks, bug881. [Mike Thyer]

****  Fix sign extension of pattern members, bug882. [Iztok Jeras]

****  Fix clang compile warnings.


* Verilator 3.868 2014-12-20

**    New verilator_coverage program added to replace SystemPerl's vcoverage.

**    PSL support was removed, please use System Verilog assertions.

**    SystemPerl mode is deprecated and now untested.

***   Support enum.first/name and similar methods, bug460, bug848.

***   Add 'string' printing and comparisons, bug746, bug747, etc.

***   Inline C functions that are used only once, msg1525. [Jie Xu]

***   Fix tracing SystemC signals with structures, bug858. [Eivind Liland]
      Note that SystemC traces will no longer show the signals
      in the wrapper, they can be seen one level further down.

****  Add --stats-vars, bug851. [Jeremy Bennett]

****  Fix bare generates in interfaces, bug789. [Bob Newgard]

****  Fix underscores in real literals, bug863. [Jonathon Donaldson]


* Verilator 3.866 2014-11-15

***   Fix +define+A+B to define A and B to match other simulators, bug847. [Adam Krolnik]

***   Add optimization of wires from arrayed cells, msg1447. [Jie Xu]

***   Add optimization of operators between concats, msg1447. [Jie Xu]

***   Add public enums, bug833. [Jonathon Donaldson]

***   Trace_off now operates on cells, bug826. [Lane Brooks]

****  Fix public parameters in unused packages, bug804. [Jonathon Donaldson]

****  Fix select when partially out-of-bound, bug823. [Cliffort Wolf]

****  Fix generate unrolling with function call, bug830. [Steven Slatter]

****  Fix cast-to-size context-determined sizing, bug828. [Geoff Barrett]

****  Fix not tracing modules following primitives, bug837. [Jie Xu]

****  Fix trace overflow on huge arrays, bug834. [Geoff Barrett]

****  Fix quoted comment slashes in defines, bug845. [Adam Krolnik]


* Verilator 3.864 2014-09-21

***   Support power operator with real, bug809. [Jonathon Donaldson]

****  Improve verilator_profcfunc time attributions. [Jonathon Donaldson]

****  Fix duplicate anonymous structures in $root, bug788. [Bob Newgard]

****  Fix mis-optimization of bit-swap in wide signal, bug800. [Jie Xu]

****  Fix error when tracing public parameters, bug722. [Jonathon Donaldson]

****  Fix dpiGetContext in dotted scopes, bug740. [Geoff Barrett]

****  Fix over-shift structure optimization error, bug803. [Jeff Bush]

****  Fix optional parameter keyword in module #(), bug810. [Iztok Jeras]

****  Fix $warning/$error multi-argument ordering, bug816. [Jonathon Donaldson]

****  Fix clang warnings, bug818. [Iztok Jeras]

****  Fix string formats under deep expressions, bug820. [Iztok Jeras]


* Verilator 3.862 2014-06-10

***   Using command line -Wno-{WARNING} now overrides file-local lint_on.

***   Add -P to suppress `line and blanks with preprocessing, bug781. [Derek Lockhart]

***   Support SV 2012 package import before port list.

****  Change SYMRSVDWORD to print as warning rather than error.

****  Fix seg-fault with variable of parameterized interface, bug692. [Jie Xu]

****  Fix false name conflict on cells in generate blocks, bug749. [Igor Lesik]

****  Fix pattern assignment to basic types, bug767. [Jie Xu]

****  Fix pattern assignment to conditionals, bug769. [Jie Xu]

****  Fix shift corner-cases, bug765, bug766, bug768, bug772, bug774, bug776. [Clifford Wolf]

****  Fix C compiler interpreting signing, bug773. [Clifford Wolf]

****  Fix late constant division by zero giving X error, bug775. [Clifford Wolf]

****  Fix gate primitives with arrays and non-arrayed pins.

****  Fix DETECTARRAY error on packed arrays, bug770. [Jie Xu]

****  Fix ENDLABEL warnings on escaped identifiers.

****  Fix string corruption, bug780. [Derek Lockhart]


* Verilator 3.860 2014-05-11

**    PSL is no longer supported, please use System Verilog assertions.

**    Support '{} assignment pattern on arrays, bug355.

**    Support streaming operators, bug649. [Glen Gibb]

**    Fix expression problems with -Wno-WIDTH, bug729, bug736, bug737, bug759.
      Where WIDTH warnings were ignored this might result in different
      warning messages and results, though it should better match the spec.
      [Clifford Wolf]

***   Add --no-trace-params.

***   Add assertions on 'unique if', bug725. [Jeff Bush]

***   Add PINCONNECTEMPTY warning. [Holger Waechtler]

***   Support parameter arrays, bug683. [Jeremy Bennett]

***   Fix begin_keywords "1800+VAMS", msg1211.

****  Documentation fixes, bug723. [Glen Gibb]

****  Support {} in always sensitivity lists, bug745. [Igor Lesik]

****  Fix tracing of package variables and real arrays.

****  Fix tracing of packed arrays without --trace-structs, bug742. [Jie Xu]

****  Fix missing coverage line on else-if, bug727. [Sharad Bagri]

****  Fix modport function import not-found error.

****  Fix power operator calculation, bug730, bug735. [Clifford Wolf]

****  Fix reporting struct members as reserved words, bug741. [Chris Randall]

****  Fix change detection error on unions, bug758. [Jie Xu]

****  Fix -Wno-UNOPTFLAT change detection with 64-bits, bug762. [Clifford Wolf]

****  Fix shift-right optimization, bug763. [Clifford Wolf]

****  Fix Mac OS-X test issues. [Holger Waechtler]

****  Fix C++-2011 warnings.


* Verilator 3.856 2014-03-11

***   Support case inside, bug708. [Jan Egil Ruud]

***   Add parameters into trace files, bug706. [Alex Solomatnikov]

****  Fix parsing "#0 'b0", bug256.

****  Fix array bound checks on real variables.

****  Fix --skip-identical mis-detecting on OS-X, bug707.

****  Fix missing VL_SHIFTRS_IQI with WIDTH warning, bug714. [Fabrizio Ferrandi]

****  Fix signed shift right optimization, bug715. [Fabrizio Ferrandi]

****  Fix internal error on "input x =" syntax error, bug716. [Lane Brooks]

****  Fix slice extraction from packed array, bug717. [Jan Egil Ruud]

****  Fix inside statement EQWILD error, bug718. [Jan Egil Ruud]


* Verilator 3.855 2014-01-18

***   Support modport import, bug696. [Jeremy Bennett]

***   Add --trace-structs to show struct names, bug673. [Chris Randall]

****  Fix tracing of packed structs, bug705. [Jie Xu]

****  Fix --lint-only with MinGW, msg1283. [HyungKi Jeong]

****  Fix some delayed assignments of typedefed unpacked arrays.

****  Fix wire declarations with size and not range, bug466. [Alex Solomatnikov]

****  Fix parameter pin vs. normal pin error, bug704. [Alex Solomatnikov]


* Verilator 3.854 2013-11-26

***   Add UNPACKED warning to convert unpacked structs. [Jeremy Bennett]

***   Add --compiler clang to work around compiler bug, bug694. [Stefan Ludwig]

****  Support vpi_get of vpiSuppressVal, bug687. [Varun Koyyalagunta]

****  Support vpi_get_time, bug688. [Varun Koyyalagunta]

****  Fix evaluation of chained parameter functions, bug684. [Ted Campbell]

****  Fix enum value extension of '1.

****  Fix multiple VPI variable callbacks, bug679. [Rich Porter]

****  Fix vpi_get of vpiSize, bug680. [Rich Porter]

****  Fix vpi_remove_cb inside callback, bug689. [Varun Koyyalagunta]

****  Fix crash with coverage of structures, bug691. [Eivind Liland]

****  Fix array assignment from const var, bug693. [Jie Xu]


* Verilator 3.853 2013-09-30

****  Add --no-order-clock-delay to work around bug613. [Charlie Brej]


* Verilator 3.852 2013-09-29

***   Support named function and task arguments. [Chris Randall]

***   Report SELRANGE warning for non-generate if, bug675. [Roland Kruse]

****  Fix ordering of $fgetc, msg1229. [Frederic Requin]

****  Fix --output-split-cfunc to count internal functions. [Chris Randall]

****  Fix crash on 32-bit Ubuntu, bug670. [Mark Jackson Pulver]


* Verilator 3.851 2013-08-15

***   Fix ordering of clock enables with delayed assigns, bug613. [Jeremy Bennett]

***   Fix vpi_iterate on memory words, bug655. [Rich Porter]

****  Fix final duplicate declarations when non-inlined, bug661. [Charlie Brej]

****  Fix interface ports with comma lists, msg1058. [Ed Lander]

****  Fix parameter real conversion from integer.

****  Fix clang warnings, bug668.  [Yutetsu Takatsukasa]


* Verilator 3.850 2013-06-02

**    Support interfaces and modports, bug102.  [Byron Bradley, Jeremy Bennett]

***   Duplicate clock gate optimization on by default, bug621.

****  Fix arrayed input compile error, bug645. [Krzysztof Jankowski]

****  Fix GCC version runtime changes, bug651. [Jeremy Bennett]

****  Fix packed array select internal error, bug652. [Krzysztof Jankowski]


* Verilator 3.847 2013-05-11

***   Add ALWCOMBORDER warning.  [KC Buckenmaier]

***   Add --pins-sc-uint and --pins-sc-biguint, bug638. [Alex Hornung]

****  Support "signal[vec]++".

****  Fix simulation error when inputs and MULTIDRIVEN, bug634. [Ted Campbell]

****  Fix module resolution with __, bug631. [Jason McMullan]

****  Fix packed array non-zero right index select crash, bug642. [Krzysztof Jankowski]

****  Fix nested union crash, bug643. [Krzysztof Jankowski]


* Verilator 3.846 2013-03-09

**    IEEE 1800-2012 is now the default language.  This adds 4 new keywords
      and updates the svdpi.h and vpi_user.h header files.

***   Add --report-unoptflat, bug611. [Jeremy Bennett]

***   Add duplicate clock gate optimization, msg980. [Varun Koyyalagunta]
      Disabled unless -OD or -O3 used, please try it as may get some
      significant speedups.

***   Fix wrong dot resolution under inlining. [Art Stamness]

****  Support pattern assignment features, bug616, bug617, bug618. [Ed Lander]

****  Support bind in $unit, bug602. [Ed Lander]

****  Support <number>'() sized casts, bug628. [Ed Lander]

****  Fix DETECTARRAY on packed structures, bug610. [Jeremy Bennett]

****  Fix LITENDIAN on unpacked structures, bug614. [Wai Sum Mong]

****  Fix 32-bit OS VPI scan issue, bug615.  [Jeremy Bennett, Rich Porter]

****  Fix opening a VerilatedVcdC file multiple times, msg1021. [Frederic Requin]

****  Fix UNOPTFLAT circular array bounds crossing, bug630. [Jie Xu]


* Verilator 3.845 2013/02/04

***   Fix nested packed arrays and struct, bug600. [Jeremy Bennett]
      Packed arrays are now represented as a single linear vector in
      Verilated models.  This may affect packed arrays that are public or
      accessed via the VPI.

***   Support wires with data types, bug608. [Ed Lander]

***   Support bind, to module names only, bug602. [Ed Lander]

***   Support VPI product info, warning calls, etc, bug588. [Rick Porter]

***   Support $left, $right and related functions, bug448. [Iztok Jeras]

***   Support inside expressions.

***   Define SYSTEMVERILOG, SV_COV_START and other IEEE mandated predefines.

****  Fix pin width mismatch error, bug595.  [Alex Solomatnikov]

****  Fix implicit one bit parameter selection, bug603.  [Jeremy Bennett]

****  Fix signed/unsigned parameter misconversion, bug606.  [Jeremy Bennett]

****  Fix segfault on multidimensional dotted arrays, bug607.  [Jie Xu]

****  Fix per-bit array output connection error, bug414.  [Jan Egil Ruud]

****  Fix package logic var compile error.

****  Fix enums with X values.


* Verilator 3.844 2013/01/09

***   Support "unsigned int" DPI import functions, msg966.  [Alex Lee]

***   Fix package resolution of parameters, bug586. [Jeremy Bennett]

****  Fix non-integer vpi_get_value, bug587.  [Rich Porter]

****  Fix task inlining under $display and case, bug589, bug598.  [Holger Waechtler]

****  Fix package import of non-localparam parameter, bug474, bug591.  [Jeremy Bennett]

****  Fix package import of package imports, partial bug592.  [Jeremy Bennett]

****  Fix package import preventing local var, bug599.  [Jeremy Bennett]

****  Fix array extraction of implicit vars, bug601.  [Joe Eiler]


* Verilator 3.843 2012/12/01

***   Add +1364-1995ext and similar language options, bug532.  [Jeremy Bennett]

****  Fix mis-optimized identical submodule subtract, bug581.  [Charlie Brej]

****  Fix crash on dotted references into dead modules, bug583.  [Jeremy Bennett]

****  Fix compile issues on MSVCC, bug571, bug577.  [Amir Gonnen]

****  Fix --debug overriding preceding --dump-treei, bug580.  [Jeremy Bennett]


* Verilator 3.842 2012/11/03

****  Add -x-initial-edge, bug570.  [Jeremy Bennett]

****  Fix parameter pins interspersed with cells broke in 3.840.  [Bernard Deadman]

****  Fix large shift error on large shift constants.  [David Welch]

****  Fix $display mangling on GCC 4.7 and speed up, msg927, bug373, bug574. [R Diez]

****  Fix array of struct references giving false error, bug566. [Julius Baxter]

****  Fix missing var access functions when no DPI, bug572. [Amir Gonnen]

****  Fix name collision on unnamed blocks, bug567.  [Chandan Egbert]

****  Fix name collision on task inputs, bug569.  [Chandan Egbert]


* Verilator 3.841 2012/09/03

***   Add --savable to support model save/restore.  [Jeremy Bennett]

***   Support '{} assignment pattern on structures, part of bug355.

****  Fix double-deep parameter cell WIDTHs, bug541.  [Hiroki Honda]

****  Fix imports under multiple instantiated cells, bug542.  [Alex Solomatnikov]

****  Fix defparam in generate broke in 3.840, bug543.  [Alex Solomatnikov]

****  Fix duplicate begin error broke in 3.840, bug548.  [Alex Solomatnikov]

****  Fix triangle symbol resolution error broke in 3.840, bug550.  [Ted Campbell]


* Verilator 3.840 2012/07/31 Beta

**    Rewrote tristate handling; supports tri0, tri1, tristate bit selects,
      concatenates and pullup/pulldowns, bug395, bug56, bug54, bug51.
      [Alex Solomatnikov, Lane Brooks, et al]

**    Support packed structures and unions, bug181.
      Note this was a major internal change that may lead to some instability.

***   Support tri0 and tri1, bug462.  [Alex Solomatnikov]

***   Support nmos and pmos, bug488.  [Alex Solomatnikov]

***   Add INITIALDLY warning on initial assignments, bug478.  [Alex Solomatnikov]

***   Add PINMISSING and PINNOCONNECT lint checks.

***   Add --converge-limit option.

***   Fix generate operators not short circuiting, bug413.  [by Jeremy Bennett]

***   Fix parameters not supported in constant functions, bug474. [Alex Solomatnikov]

****  Fix duplicate warnings/errors, bug516.  [Alex Solomatnikov]

****  Fix signed extending biops with WIDTH warning off, bug511. [Junji Hashimoto]

****  Fix ITOD internal error on real conversions, bug491.  [Alex Solomatnikov]

****  Fix input and real loosing real data type, bug501.  [Alex Solomatnikov]

****  Fix imports causing symbol table error, bug490.  [Alex Solomatnikov]

****  Fix newlines in radix values, bug507. [Walter Lavino]

****  Fix loop error message to report line, bug513.  [Jeremy Bennett]

****  Fix false UNUSED warning on file system calls.

****  Fix GCC 4.7.0 compile warnings, bug530.  [Jeremy Bennett]

****  Fix svdpi.h compile error on Apple OS.

****  Fix compile error under git submodules, bug534. [Aurelien Francillon]


* Verilator 3.833 2012/04/15

***   Support += and -= in standard for loops, bug463. [Alex Solomatnikov]

***   Fix processing unused parametrized modules, bug469, bug470.  [Alex Solomatnikov]

****  Add SELRANGE as warning instead of error, bug477. [Alex Solomatnikov]

****  Add readme.pdf and internal.pdf and doxygen, bug483.  [by Jeremy Bennett]

****  Fix change detections on arrays, bug364.  [John Stevenson, Alex Solomatnikov]

****  Fix signed array warning, bug456. [Alex Solomatnikov]

****  Fix genvar and begin under generate, bug461.  [Alex Solomatnikov]

****  Fix real constant parameter functions, bug475.  [Alex Solomatnikov]

****  Fix and document --gdb option, bug454. [Jeremy Bennett]

****  Fix OpenSolaris compile error. [Sanjay Singh]


* Verilator 3.832 2012/03/07

***   Fix memory delayed assignments from multiple clock domains. [Andrew Ling]

***   Support arrayed SystemC I/O pins.  [Christophe Joly]

***   Report MULTIDRIVEN on memories set in multiple clock domains.

***   Report ENDLABEL on mismatching end labels, bug450. [Iztok Jeras]

****  Fix expansion of back-slashed escaped macros, bug441. [Alberto Del Rio]

****  Fix inheriting real and signed type across untyped parameters.

****  Fix core dump with over 100 deep UNOPTFLAT, bug432. [Joe Eiler]

****  Fix false command not found warning in makefiles. [Ruben Diez]

****  Fix hang when functions inside begin block. [David Welch]

****  Fix hang on recursive substitution `defines, bug443. [Alex Solomatnikov]


* Verilator 3.831 2012/01/20

**    Support SystemC 2.3.0 prerelease.  This requires setting the new
      SYSTEMC_INCLUDE and SYSTEMC_LIBDIR variables in place of now
      deprecated SYSTEMC and SYSTEMC_ARCH.  [Iztok Jeras]

****  Suppress VARHIDDEN on dpi import arguments.  [Ruben Diez]

****  Support "generate for (genvar i=0; ...".  [David Kravitz]

****  Fix dpi exports with > 32 bit but < 64 bit args, bug423. [Chandan Egbert]

****  Fix array of instantiations with sub-range output, bug414. [Jeremy Bennett]

****  Fix BLKSEQ warnings on variables declared inside always. [Ruben Diez]


* Verilator 3.830 2011/11/27

**   With "--language VAMS" support a touch of Verilog AMS.  [Holger Waechtler]

***  Add sc_bv attribute to force bit vectors, bug402. [by Stefan Wallentowitz]

**** Search for user -y paths before default current directory.  [Ruben Diez]

**** Support constants in sensitivity lists, bug412.  [Jeremy Bennett]

**** Support $system.  [Ruben Diez]

**** Support $sscanf with %g. [Holger Waechtler]

**** Indicate 'exiting due to errors' if errors, not warnings. [Ruben Diez]

**** Fix bad result with if-else-return optimization, bug420. [Alex Solomatnikov]

**** Fix reporting not found modules if generate-off, bug403. [Jeremy Bennett]

**** Fix $display with %d following %g. [Holger Waechtler]


* Verilator 3.824 2011/10/25

***  Fix "always @ (* )", bug403, bug404.  [Walter Lavino]

***  Add ASSIGNIN as suppressable error.  [Jeremy Bennett]

**** Fix 3.823 constructor core dump on Debian, bug401.  [Ahmed El-Mahmoudy]


* Verilator 3.823 2011/10/20

***  Support $ceil, $floor, etc.  [Alex Solomatnikov]

***  Add configure options for cc warnings and extended tests.  [Ruben Diez]

***  Add -Wall reporting ASSIGNDLY on assignment delays.  [Ruben Diez]

***  Fix UNDRIVEN warnings inside DPI import functions.  [Ruben Diez]

***  Fix --help output to go to stderr, not stdout, bug397.  [Ruben Diez]

**** Fix DPI import output of 64 bits, bug398. [Mike Denio]

**** Fix DPI import false BLKSEQ warnings.  [Alex Solomatnikov]

**** Fix MSVC compile warning with trunc/round, bug394. [Amir Gonnen]

**** Fix autoconf and Makefile warnings, bug396.  [Ruben Diez]


* Verilator 3.821 2011/09/14

**** Fix PowerPC runtime error, bug288. [Ahmed El-Mahmoudy]

**** Fix internal error on integer casts, bug374. [Chandan Egbert]


* Verilator 3.820 2011/07/28

**   Support 'real' numbers and related functions.

***  Support 'const' variables in limited cases; similar to enums. [Alex Solomatnikov]

***  Support disable for loop escapes.

***  Support $fopen and I/O with integer instead of `verilator_file_descriptor.

***  Support coverage in -cc and -sc output modes.  [John Li]
     Note this requires SystemPerl 1.338 or newer.

**** Fix vpi_register_cb using bad s_cb_data, bug370.  [by Thomas Watts]

**** Fix $display missing leading zeros in %0d, bug367.  [Alex Solomatnikov]

**** Use 'vluint64_t' for SystemC instead of (same sized) 'uint64' for MSVC++.


* Verilator 3.813 2011/06/28

***  Support bit vectors > 64 bits wide in DPI import and exports.

***  Fix out of memory on slice syntax error, bug354.  [Alex Solomatnikov]

**** Fix error on enum references to other packages, bug339. [Alex Solomatnikov]

**** Fix DPI undeclared svBitVecVal compile error, bug346. [Chandan Egbert]

**** Fix DPI bit vector compile errors, bug347, bug359. [Chandan Egbert]

**** Fix CDCRSTLOGIC report showing endpoint flops without resets.

**** Fix compiler warnings on SPARC, bug288. [Ahmed El-Mahmoudy]


* Verilator 3.812 2011/04/06

***  Add --trace-max-width and --trace-max-array, bug319.  [Alex Solomatnikov]

***  Add --Wno-fatal to turn off abort on warnings. [by Stefan Wallentowitz]

**** Support ${...} and $(...) env vars in .vc files.  [by Stefan Wallentowitz]

**** Support $bits(data_type), bug327.  [Alex Solomatnikov]

**** Support loop unrolling on width mismatches, bug333. [Joe Eiler]

**** Support simple cast operators, bug335.  [Alex Solomatnikov]

**** Accelerate bit-selected inversions.

**** Add error on circular parameter definitions, bug329. [Alex Solomatnikov]

**** Fix concatenates and vectored bufif1, bug326. [Iztok Jeras]


* Verilator 3.811 2011/02/14

**** Report errors on duplicated or empty pins, bug321.  [Christian Leber]

**** Report error on function call output tied to constant.  [Bernard Deadman]

**** Throw UNUSED/UNDRIVEN only once per net in a parametrized module.

**** Fix internal error on functions called as SV tasks.  [Bernard Deadman]

**** Fix internal error on non-inlined inout pins.  [Jeff Winston]

**** Fix false BLKSEQ on non-unrolled for loop indexes.  [Jeff Winston]

**** Fix block comment not separating identifiers, bug311. [Gene Sullivan]

**** Fix warnings to point to lowest net usage, not upper level ports.

**** Fix error on constants connected to outputs, bug323.  [Christian Leber]


* Verilator 3.810 2011/01/03

**   Add limited support for VPI access to public signals, see docs.

***  Add -F option to read relative option files, bug297. [Neil Hamilton]

***  Support ++,--,+= etc as standalone statements.  [Alex Solomatnikov]

**** When running with VERILATOR_ROOT, optionally find binaries under bin.

**** Suppress WIDTH warnings when adding/subtracting 1'b1.

**   Add -Wall, -Wwarn-style, -Wno-style to enable code style warnings
     that have been added to this release, and disabled by default:

***  With --Wall, add BLKSEQ warning on blocking assignments in seq blocks.

***  With --Wall, add DECLFILENAME warning on modules not matching filename.

***  With --Wall, add DEFPARAM warning on deprecated defparam statements.

***  With --Wall, add IFDEPTH warning on deep if statements.

***  With --Wall, add INCABSPATH warning on `include with absolute paths.

***  With --Wall, add SYNCASYNCNET warning on mixed sync/async reset nets.

***  With --Wall, add UNDRIVEN warning on undriven nets.

***  With --Wall, add UNUSED warning on unused nets.

***  The VARHIDDEN warning is now disabled by default, use -Wall to enable.


* Verilator 3.805 2010/11/02

**** Add warning when directory contains spaces, msg378.  [Salman Sheikh]

**** Fix wrong filename on include file errors, bug289. [Brad Parker]

**** Fix segfault on SystemVerilog "output wire foo=0", bug291.  [Joshua Wise]

**** Fix DPI export name not found, msg369.  [Terry Chen]


* Verilator 3.804 2010/09/20

***  Support tracing/coverage of underscore signals, bug280.  [by Jason McMullan]

**** Fix preprocessor `` of existing base define, bug283.  [Usha Priyadharshini]

**** Increase define recursions before error.  [Paul Liu]

**** On core dump, print debug suggestions.


* Verilator 3.803 2010/07/10

***  Fix preprocessor preservation of newlines across macro substitutions.

**** Fix preprocessor stringification of nested macros.

**** Fix some constant parameter functions causing crash, bug253. [Nick Bowler]

**** Fix do {...} while() not requiring final semicolon.


* Verilator 3.802 2010/05/01

***  Support runtime access to public signal names.

***  Add /*verilator public_flat_rw*/ for timing-specific public access.

***  Fix word size to match uint64_t on -m64 systems, bug238. [Joe Eiler]

**** Improve error handling on slices of arrays, bug226. [by Byron Bradley]

**** Report errors when extra underscores used in meta-comments.

**** Fix bit reductions on multi-packed dimensions, bug227. [by Byron Bradley]

**** Fix removing $fscanf if assigned to unused var, bug248. [Ashutosh Das]

**** Fix "make install" with configure outside srcdir.  [Stefan Wallentowitz]

**** Fix loop unroller out of memory; change --unroll-stmts.  [Ashutosh Das]

**** Fix trace files with empty modules crashing some viewers.

**** Fix parsing single files > 2GB.  [Jeffrey Short]

**** Fix installing data files as non-executable, bug168. [by Ahmed El-Mahmoudy]


* Verilator 3.801 2010/03/17

***  Support "break", "continue", "return".

***  Support "`default_nettype none|wire".  [Dominic Plunkett]

**** Skip SystemC tests if not installed.  [Iztok Jeras]

**** Fix clock-gates with non-AND complex logic, bug220. [Ashutosh Das]

**** Fix flushing VCD buffers on $stop.  [Ashutosh Das]

**** Fix Mac OS-X compile issues, bug217.  [Joshua Wise, Trevor Williams]

**** Fix make uninstall, bug216.  [Iztok Jeras]

**** Fix parametrized defines with empty arguments.


* Verilator 3.800 2010/02/07

Application visible changes:

**   SystemPerl is no longer required for tracing.
     Applications must use VerilatedVcdC class in place of SpTraceVcdC.

**   SystemVerilog 1800-2009 is now the default language.
     Thus "global" etc are now keywords.  See the --language option.

New features:

**   Support SystemVerilog types "byte", "chandle", "int", "longint",
     "shortint", "time", "var" and "void" in variables and functions.

**   Support "program", "package", "import" and $unit.

**   Support typedef and enum.  [by Donal Casey]

**   Support direct programming interface (DPI) "import" and "export".
     Includes an extension to map user $system PLI calls to the DPI.

***  Support assignments of multidimensional slices, bug170. [by Byron Bradley]

***  Support multidimensional inputs/outputs, bug171. [by Byron Bradley]

***  Support "reg [1:0][1:0][1:0]" and "reg x [3][2]", bug176.  [Byron Bradley]

***  Support declarations in loop initializers, bug172.  [by Byron Bradley]

***  Support $test$plusargs and $value$plusargs, but see the docs!

***  Support $sformat and $swrite.

***  Support 1800-2009 define defaults and `undefineall.

***  Add -CFLAGS, -LDFLAGS, <file>.a, <file>.o, and <file>.so options.

***  Speed compiles by avoiding including the STL iostream header.
     Application programs may need to include it themselves to avoid errors.

***  Add experimental clock domain crossing checks.

***  Add experimental --pipe-filter to filter all Verilog input.

***  Add experimental config files to filter warnings outside of the source.

***  Add VARHIDDEN warning when signal name hides module name.

**** Support optional cell parenthesis, bug179. [by Byron Bradley]

**** Support for loop i++, ++i, i--, --i, bug175. [by Byron Bradley]

**** Support 1800-2009 /*comments*/ in define values.

**** Add Makefile VM_GLOBAL_FAST, listing objects needed to link executables.

**** Add --bbox-unsup option to black-box unsupported UDP tables.

**** Add -Wno-MODDUP option to allow duplicate modules.

Bug fixes:

**** Fix implicit variable issues, bug196, bug201. [Byron Bradley]

**** Fix 'for' variable typing, bug205.  [by Byron Bradley]

**** Fix tracing with --pins-bv 1, bug195.  [Michael S]

**** Fix MSVC++ 2008 compile issues, bug209.  [Amir Gonnen]

**** Fix MinGW compilation, bug184, bug214. [by Shankar Giri, Amir Gonnen]

**** Fix Cygwin 1.7.x compiler error with uint32_t, bug204.  [Ivan Djordjevic]

**** Fix `define argument mis-replacing system task of same name, bug191.

**** Fix Verilator core dump on wide integer divides, bug178. [Byron Bradley]

**** Fix lint_off/lint_on meta comments on same line as warning.


* Verilator 3.720 2009/10/26

**   Support little endian bit vectors ("reg [0:2] x;").

**   Support division and modulus of > 64 bit vectors.  [Gary Thomas]

***  Fix writing to out-of-bounds arrays writing element 0.

**** Fix core dump with SystemVerilog var declarations under unnamed begins.

**** Fix VCD files showing internal flattened hierarchy, broke in 3.714.

**** Fix cell port connection to unsized integer causing false width warning.

**** Fix erroring on strings with backslashed newlines, bug168. [Pete Nixon]


* Verilator 3.714 2009/09/18

**   Add --bbox-sys option to blackbox $system calls.

**   Support generate for var++, var--, ++var, --var.

***  Improved warning when "do" used as identifier.

**** Don't require SYSTEMPERL_INCLUDE if SYSTEMPERL/src exists. [Gary Thomas]

**** Fix deep defines causing flex scanner overflows. [Brad Dobbie]

**** Fix preprocessing commas in deep parameterized macros. [Brad Dobbie]

**** Fix tracing escaped dotted identifiers, bug107.

**** Fix $display with uppercase %M.

**** Fix --error-limit option being ignored.


* Verilator 3.713 2009/08/04

**   Support constant function calls for parameters. [many!]

***  Support SystemVerilog "logic", bug101.  [by Alex Duller]

***  Name SYMRSVDWORD error, and allow disabling it, bug103. [Gary Thomas]

**** Fix escaped preprocessor identifiers, bug106. [Nimrod Gileadi]


* Verilator 3.712 2009/07/14

**   Patching SystemC is no longer required to trace sc_bvs.

***  Support zero-width constants in concatenations.  [Jeff Winston]

***  Add verilator --pins-uint8 option to use sc_in<uint8_t/uint16_t>.

***  Add verilator -V option, to show verbose version.

***  On WIDTH warnings, show variable name causing error.  [Jeff Winston]

**** Add BLKLOOPINIT error code, and describe --unroll-count.  [Jeff Winston]


* Verilator 3.711 2009/06/23

**** Support decimal constants of arbitrary widths. [Mark Marshall]

**** Fix error on case statement with all duplicate items, bug99. [Gary Thomas]

**** Fix segfault on unrolling for's with bad inits, bug90. [Andreas Olofsson]

**** Fix tristates causing "Assigned pin is neither...". [by Lane Brooks]

**** Fix compiler errors under Fedora release candidate 11. [Chitlesh Goorah]


* Verilator 3.710 2009/05/19

**   Verilator is now licensed under LGPL v3 and/or Artistic v2.0.

***  `__FILE__ now expands to a string, per draft SystemVerilog 2010(ish).

**** The front end parser has been re-factored to enable more SV parsing.
     Code should parse the same, but minor parsing bugs may pop up.

**** Verilator_includer is no longer installed twice, bug48.  [Lane Brooks]

**** Fix escaped identifiers with '.' causing conflicts, bug83.  [J Baxter]

**** Fix define formal arguments that contain newlines, bug84. [David A]


* Verilator 3.703 2009/05/02

***  Fix $clog2 calculation error with powers-of-2, bug81. [Patricio Kaplan]

**** Fix error with tasks that have output first, bug78.  [Andrea Foletto]

**** Fix "cloning" error with -y/--top-module, bug76. [Dimitris Nalbantis]

**** Fix segfault with error on bad --top-module, bug79. [Dimitris Nalbantis]

**** Fix "redefining I" error with complex includes.  [Duraid Madina]

**** Fix GCC 4.3.2 compile warnings.


* Verilator 3.702 2009/03/28

***  Add --pins-bv option to use sc_bv for all ports.  [Brian Small]

***  Add SYSTEMPERL_INCLUDE envvar to assist RPM builds.  [Chitlesh Goorah]

**** Report errors when duplicate labels are used, bug72.  [Vasu Kandadi]

**** Fix the SC_MODULE name() to not include __PVT__.  [Bob Fredieu]


* Verilator 3.701 2009/02/26

**   Support repeat and forever statements.  [Jeremy Bennett]

***  Add --debugi-<srcfile> option, for internal debugging. [Dennis Muhlestein]

**** Fix compile issues with GCC 4.3, bug47.  [Lane Brooks]

**** Fix VL_RANDom to better randomize bits.  [Art Stamness]

**** Fix error messages to consistently go to stderr. [Jeremy Bennett]

**** Fix left associativity for ?: operators.


* Verilator 3.700 2009/01/08

**   Add limited support for tristate inouts.  Written by Lane Brooks,
     under support by Ubixum Inc.  This allows common pad ring and
     tristate-mux structures to be Verilated.  See the documentation for
     more information on supported constructs.

**   Add --coverage_toggle for toggle coverage analysis.
     Running coverage now requires SystemPerl 1.301 or newer.

***  Add /*verilator coverage_on/_off */ to bracket coverage regions.

***  Optimize two-level shift and and/or trees, +23% on one test.

***  Support posedge of bit-selected signals, bug45. [Rodney Sinclair]

***  Line coverage now aggregates by hierarchy automatically.
     Previously this would be done inside SystemPerl, which was slower.

**** Minor performance improvements of Verilator compiler runtime.

**** Coverage of each parametarized module is counted separately. [Bob Fredieu]

**** Fix creating parameterized modules when no parameter values are changed.

**** Fix certain generate-if cells causing "clone" error. [Stephane Laurent]

**** Fix line coverage of public functions.  [Soon Koh]

**** Fix SystemC 2.2 deprecated warnings about sensitive() and sc_start().

**** Fix arrayed variables under function not compiling, bug44. [Ralf Karge]

**** Fix --output-split-cfuncs to also split trace code. [Niranjan Prabhu]

**** Fix 'bad select range' warning missing some cases, bug43. [Lane Brooks]

**** Fix internal signal names containing control characters (broke in 3.680).

**** Fix compile error on Ubuntu 8.10. [Christopher Boumenot]

**** Fix internal error on "output x; reg x = y;".

**** Fix wrong result for read of delayed FSM signal, bug46. [Rodney Sinclair]


* Verilator 3.681 2008/11/12

***  Add SystemVerilog unique and priority case.

**** Include Verilog file's directory name in coverage reports.

**** Fix 'for' under 'generate-for' causing error; bug38. [Rafael Shirakawa]

**** Fix coverage hierarchy being backwards with inlining.  [Vasu Arasanipalai]

**** Fix GCC 4.3 compile error; bug35.  [Lane Brooks]

**** Fix MSVC compile error; bug42.  [John Stroebel]


* Verilator 3.680 2008/10/08

**   Support negative bit indexes. [Stephane Laurent]
     Tracing negative indexes requires latest Verilog-Perl and SystemPerl.

***  Suppress width warnings between constant strings and wider vectors.
     [Rodney Sinclair]

**** Ignore SystemVerilog timeunit and timeprecision.

**** Expand environment variables in -f input files.  [Lawrence Butcher]

**** Report error if port declaration is missing; bug32. [Guy-Armand Kamendje]

**** Fix genvars causing link error when using --public.  [Chris Candler]


* Verilator 3.671 2008/09/19

**   SystemC uint64_t pins are now the default instead of sc_bv<64>.
     Use --no-pins64 for backward compatibility.

***  Support SystemVerilog "cover property" statements.

***  When warnings are disabled on signals that are flattened out, disable
     the warnings on the signal(s) that replace it.

***  Add by-design and by-module subtotals to verilator_profcfunc.

***  Fix extra evaluation of pure combo blocks in SystemC output.

**** Add IMPERFECTSCH warning, disabled by default.

**** Support coverage under SystemPerl 1.285 and newer.

**** Fix stack overflow on large ? : trees. [John Sanguinetti]

**** Support arbitrary characters in identifiers. [Stephane Laurent]


* Verilator 3.670 2008/07/23

**   Add --x-assign=fast option, and make it the default.
     This chooses performance over reset debugging.  See the manual.

**   Add --autoflush, for flushing streams after $display.  [Steve Tong]

**   Add CASEWITHX lint warning and if disabled fix handling of casez with Xs.

***  Add $feof, $fgetc, $fgets, $fflush, $fscanf, $sscanf. [Holger Waechtler]

***  Add $stime. [Holger Waechtler]

***  Add $random.

***  Add --Wfuture-, for improving forward compatibility.

**** Fix verilator_includer not being installed properly.  [Holger Waechtler]

**** Fix IMPURE errors due to X-assignment temporary variables. [Steve Tong]

**** Fix "lvalue" errors with public functions; bug25.  [CY Wang]

**** Add WIDTH warning to $fopen etc file descriptors.

**** Internal changes to how $displays get compiled and executed.


* Verilator 3.665 2008/06/25

**** Ignore "// verilator" comments alone on endif lines.  [Rodney Sinclair]

**** "Make install" now installs verilator_includer and verilator_profcfunc.

**** Fix tracing missing changes on undriven public wires. [Rodney Sinclair]

**** Fix syntax error when "`include `defname" is ifdefed.  [John Dickol]

**** Fix error when macro call has commas in concatenate. [John Dickol]

**** Fix compile errors under Fedora 9, GCC 4.3.0.  [by Jeremy Bennett]

**** Fix Makefile to find headers/libraries under prefix. [by Holger Waechtler]


* Verilator 3.664 2008/05/08

**** Fix missing file in kit.


* Verilator 3.663 2008/05/07

**** Add DESTDIR to Makefiles to assist RPM construction. [Gunter Dannoritzer]

**** Fix compiler warnings under GCC 4.2.1.

**** Fix preprocessor `else after series of `elsif.  [Mark Nodine]

**** Fix parametrized defines calling define with comma.  [Joshua Wise]

**** Fix comma separated list of primitives.  [by Bryan Brady]


* Verilator 3.662 2008/04/25

***  Add Verilog 2005 $clog2() function.
     This is useful in calculating bus-widths from parameters.

***  Support /**/ comments in -f option files. [Stefan Thiede]

**** Add error message when modules have duplicate names. [Stefan Thiede]

**** Support defines terminated in EOF, though against spec. [Stefan Thiede]

**** Support optional argument to $finish and $stop.  [by Stefan Thiede]

**** Support ranges on gate primitive instantiations. [Stefan Thiede]

**** Ignore old standard(ish) Verilog-XL defines.  [by Stefan Thiede]

**** Fix "always @ ((a) or (b))" syntax error. [by Niranjan Prabhu]

**** Fix "output reg name=expr;" syntax error. [Martin Scharrer]

**** Fix multiple .v files being read in random order. [Stefan Thiede]

**** Fix internal error when params get non-constants. [Johan Wouters]

**** Fix bug introduced in 3.661 with parametrized defines.


* Verilator 3.661 2008/04/04

***  The --enable-defenv configure option added in 3.660 is now the default.
     This hard-codes a default for VERILATOR_ROOT etc in the executables.

***  Add --language option for supporting older code. [Stefan Thiede]

***  Add --top-module option to select between multiple tops. [Stefan Thiede]

***  Unsized concatenates now give WIDTHCONCAT warnings. [Jonathan Kimmitt]
     Previously they threw fatal errors, which in most cases is correct
     according to spec, but can be incorrect in presence of parameter values.

**** Support functions with "input integer".  [Johan Wouters]

**** Ignore delays attached to gate UDPs.  [Stefan Thiede]

**** Fix SystemVerilog parameterized defines with `` expansion,
     and fix extra whitespace inserted on substitution.  [Vladimir Matveyenko]

**** Fix no-module include files on command line.  [Stefan Thiede]

**** Fix dropping of backslash quoted-quote at end of $display.

**** Fix task output pin connected to non-variables. [Jonathan Kimmitt]

**** Fix missing test_v in install datadir. [Holger Waechtler]

**** Fix internal error after MSB < LSB error reported to user. [Stefan Thiede]


* Verilator 3.660 2008/03/23

***  Add support for hard-coding VERILATOR_ROOT etc in the executables,
     to enable easier use of Verilator RPMs.  [Gunter Dannoritzer]

***  Allow multiple .v files on command line.  [Stefan Thiede]

***  Convert re-defining macro error to warning.  [Stefan Thiede]

***  Add --error-limit option.  [Stefan Thiede]

***  Allow __ in cell names by quoting them in C.  [Stefan Thiede]

**** Fix genvar to be signed, so "< 0" works properly.  [Niranjan Prabhu]

**** Fix assignments to inputs inside functions/tasks.  [Patricio Kaplan]

**** Fix definitions in main file.v, referenced in library.  [Stefan Thiede]

**** Fix undefined assigns to be implicit warnings. [Stefan Thiede]


* Verilator 3.658 2008/02/25

**** Fix unistd compile error in 3.657.  [Patricio Kaplan, Jonathan Kimmitt]


* Verilator 3.657 2008/02/20

**** Fix assignments of {a,b,c} = {c,b,a}.  [Jonathan Kimmitt]

**** Fix Perl warning with --lint-only.  [by Ding Xiaoliang]

**** Avoid creating obj_dir with --lint-only.  [Ding Xiaoliang]

**** Fix parsing of always @(*).  [Patricio Kaplan]


* Verilator 3.656 2008/01/18

**** Wide VL_CONST_W_#X functions are now made automatically. [Bernard Deadman]
     In such cases, a new {prefix}__Inlines.h file will be built and included.

**** Fixed sign error when extracting from signed memory.  [Peter Debacker]

**** Fixed tracing of SystemC w/o SystemPerl. [Bernard Deadman, Johan Wouters]


* Verilator 3.655 2007/11/27

***  Support "#delay <statement>;" with associated STMTDLY warning.

**** Fixed generate for loops with constant zero conditions. [Rodney Sinclair]

**** Fixed divide-by-zero errors in constant propagator. [Rodney Sinclair]

**** Fixed wrong result with obscure signed-shift underneath a "? :".

**** Fixed many internal memory leaks, and added leak detector.


* Verilator 3.654 2007/10/18

**** Don't exit early if many warnings but no errors are found. [Stan Mayer]

**** Fixed parsing module #(parameter x,y) declarations. [Oleg Rodionov]

**** Fixed parsing system functions with empty parens. [Oleg Rodionov]


* Verilator 3.653 2007/8/1

**** Support SystemVerilog ==? and !=? operators.

**** Fixed SC_LIBS missing from generated makefiles. [Ding Xiaoliang]


* Verilator 3.652 2007/6/21

**** Report as many warning types as possible before exiting.

**** Support V2K portlists with "input a,b,...".  [Mark Nodine]

**** Support V2K function/task argument lists.

**** Optimize constant $display arguments.

**** Fixed Preprocessor dropping some `line directives.  [Mark Nodine]


* Verilator 3.651 2007/5/22

***  Added verilator_profcfunc utility.  [Gene Weber]

***  Treat modules within `celldefine and `endcelldefine as if in library.

***  Support functions which return integers.  [Mark Nodine]

**** Warn if flex is not installed.  [Ralf Karge]

**** Ignore `protect and `endprotect.

**** Allow empty case/endcase blocks.


* Verilator 3.650 2007/4/20

**   Add --compiler msvc option.  This is now required when Verilated code
     is to be run through MSVC++.  This also enables fixing MSVC++ error
     C1061, blocks nested too deeply.  [Ralf Karge]

**   Add --lint-only option, to lint without creating other output.

***  Add /*verilator lint_save*/ and /*verilator lint_restore*/ to allow
     friendly control over re-enabling lint messages.  [Gerald Williams]

***  Support SystemVerilog .name and .* interconnect.

***  Support while and do-while loops.

***  Use $(LINK) instead of $(CXX) for Makefile link rules.  [Gerald Williams]

***  Add USER_CPPFLAGS and USER_LDFLAGS to Makefiles.  [Gerald Williams]

**** Fixed compile errors under Windows MINGW compiler.  [Gerald Williams]

**** Fixed dotted bit reference to local memory.  [Eugene Weber]

**** Fixed 3.640 `verilog forcing IEEE 1364-1995 only.  [David Hewson]


* Verilator 3.640 2007/3/12

***  Support Verilog 2005 `begin_keywords and `end_keywords.

***  Updated list of SystemVerilog keywords to correspond to IEEE 1800-2005.

***  Add /*verilator public_flat*/.  [Eugene Weber]

**** Try all +libext's in the exact order given.  [Michael Shinkarovsky]

**** Fixed elimination of public signals assigned to constants.  [Eugene Weber]

**** Fixed internal error when public for loop has empty body.  [David Addison]

**** Fixed "Loops detected" assertion when model exceeds 4GB.  [David Hewson]

**** Fixed display %m names inside named blocks.


* Verilator 3.633 2007/2/7

***  Add --trace-depth option for minimizing VCD file size. [Emerson Suguimoto]

***  With VL_DEBUG, show wires causing convergence errors. [Mike Shinkarovsky]

**** Fixed isolate_assignments when many signals per always. [Mike Shinkarovsky]

**** Fixed isolate_assignments across task/func temporaries. [Mike Shinkarovsky]

**** Fixed $display's with array select followed by wide AND.  [David Hewson]


* Verilator 3.632 2007/1/17

***  Add /*verilator isolate_assignments*/ attribute.  [Mike Shinkarovsky]


* Verilator 3.631 2007/1/2

**   Support standard NAME[#] for cells created by arraying or generate for.
     This replaces the non-standard name__# syntax used in earlier versions.

**** Fixed again dotted references into generate cells.  [David Hewson]
     Verilator no longer accepts duplicated variables inside unique
     generate blocks as this is illegal according to the specification.

**** Fixed $readmem* with filenames < 8 characters.  [Emerson Suguimoto]


* Verilator 3.630 2006/12/19

**   Support $readmemb and $readmemh.  [Eugene Weber, Arthur Kahlich]

***  Fixed configure and compiling under Solaris.  [Bob Farrell]

***  When dotted signal lookup fails, help the user by showing known scopes.

***  Reduce depth of priority encoded case statements.  [Eugene Weber]

**** Fixed dotted references inside generated cells.  [David Hewson]

**** Fixed missed split optimization points underneath other re-split blocks.


* Verilator 3.623 2006/12/05

***  Add --output-split-cfuncs for accelerating GCC compile. [Eugene Weber]

**** Fixed $signed mis-extending when input has a WIDTH violation. [Eugene Weber]

**** Add M32 make variable to support -m32 compiles.  [Eugene Weber]


* Verilator 3.622 2006/10/17 Stable

**** Fixed --skip-identical without --debug, broken in 3.621.  [Andy Meier]


* Verilator 3.621 2006/10/11 Beta

**   Add /*verilator no_inline_task*/ to prevent over-expansion. [Eugene Weber]

***  Public functions now allow > 64 bit arguments.

**** Remove .vpp intermediate files when not under --debug.

**** Fixed link error when using --exe with --trace.  [Eugene Weber]

**** Fixed mis-optimization of wide concats with constants.

**** Fixed core dump on printing error when not under --debug.  [Allan Cochrane]


* Verilator 3.620 2006/10/04 Stable

***  Support simple inout task ports.  [Eugene Weber]

***  Allow overriding Perl, Flex and Bison versions.  [by Robert Farrell]

***  Optimize variables set to constants within basic blocks for ~3%.

**** Default make no longer makes the docs; if you edit the documentation.
     sources, run "make info" to get them.

**** Optimize additional boolean identities (a|a = a, etc.)

**** Fixed coredump when dotted cross-ref inside task call. [Eugene Weber]

**** Fixed dotted variables in always sensitivity lists. [Allan Cochrane]


* Verilator 3.610 2006/09/20 Stable

***  Verilator now works under DJGPP (Pentium GCC).  [John Stroebel]

**** Add default define for VL_PRINTF.  [John Stroebel]

**** Removed coverage request variable; see Coverage limitations in docs.

**** Fixed DOS carriage returns in multiline defines.  [Ralf Karge]

**** Fixed printf format warnings on 64-bit linux.


* Verilator 3.602 2006/09/11 Stable

**** Fixed function references under top inlined module.  [David Hewson]


* Verilator 3.601 2006/09/06 Beta

***  Added --inhibit-sim flag for environments using old __Vm_inhibitSim.

***  Added `systemc_dtor for destructor extensions.  [Allan Cochrane]

***  Added -MP to make phony dependencies, ala GCC's.

***  Changed how internal functions are invoked to reduce aliasing.
     Useful when using GCC's -O2 or -fstrict-aliasing, to gain another ~4%.

**** Fixed memory leak when destroying modules.  [John Stroebel]

**** Fixed coredump when unused modules have unused cells.  [David Hewson]

**** Fixed 3.600 internal error with arrayed instances.  [David Hewson]

**** Fixed 3.600 internal error with non-unrolled function loops.  [David Hewson]

**** Fixed $display %m name not matching Verilog name inside SystemC modules.

**** Declare optimized lookup tables as 'static', to reduce D-Cache miss rate.


* Verilator 3.600 2006/08/28 Beta

**   Support dotted cross-hierarchy variable and task references.

**** Lint for x's in generate case statements.

**** Fixed line numbers being off by one when first file starts with newline.

**** Fixed naming of generate for blocks to prevent non-inline name conflict.

**** Fixed redundant statements remaining after table optimization.


* Verilator 3.542 2006/08/11 Stable

**** Fixed extraneous UNSIGNED warning when comparing genvars.  [David Hewson]

**** Fixed extra white space in $display %c.  [by David Addison]

**** vl_finish and vl_fatal now print via VL_PRINTF rather then cerr/cout.

**** Add VL_CONST_W_24X macro.  [Bernard Deadman]


* Verilator 3.541 2006/07/05 Beta

***  Fixed "// verilator lint_on" not re-enabling warnings.  [David Hewson]

***  Fixed 3.540's multiple memory assignments to same block.  [David Hewson]

**** Add warning on changeDetect to arrayed structures.  [David Hewson]

**** Fixed non-zero start number for arrayed instantiations.  [Jae Hossell]

**** Fixed GCC 4.0 header file warnings.


* Verilator 3.540 2006/06/27 Beta

**** Optimize combo assignments that are used only once, ~5-25% faster.

**** Optimize delayed assignments to memories inside loops, ~0-5% faster.

**** Fixed mis-width warning on bit selects of memories.  [David Hewson]

**** Fixed mis-width warning on dead generate-if branches.  [Jae Hossell]


* Verilator 3.533 2006/06/05 Stable

***  Add PDF user manual, verilator.pdf.

**** Fixed delayed bit-selected arrayed assignments. [David Hewson]

**** Fixed execution path to Perl.  [Shanshan Xu]

**** Fixed Bison compile errors in verilog.y.  [by Ben Jackson]


* Verilator 3.531 2006/05/10 Stable

***  Support $c routines which return 64 bit values.

**** Fixed `include `DEFINE.

**** Fixed Verilator core dump when have empty public function. [David.Hewson]


* Verilator 3.530 2006/04/24 Stable

**   $time is now 64 bits.  The macro VL_TIME_I is now VL_TIME_Q, but calls
     the same sc_time_stamp() function to get the current time.


* Verilator 3.523 2006/03/06 Stable

**** Fixed error line numbers being off due to multi-line defines.  [Mat Zeno]

**** Fixed GCC sign extending (uint64_t)(a<b). [David Hewson]

**** Fixed `systemc_imp_header "undefined macro" error.


* Verilator 3.522 2006/02/23 Beta

**** Add UNUSED error message, for forward compatibility.


* Verilator 3.521 2006/02/14 Beta

***  Create new --coverage-line and --coverage-user options. [Peter Holmes]

**** Added SystemVerilog 'x,'z,'0,'1, and new string literals.

**** Fixed public module's parent still getting inlined.


* Verilator 3.520 2006/01/14 Stable

**   Added support for $fopen, $fclose, $fwrite, $fdisplay.
     See documentation, as the file descriptors differ from the standard.


* Verilator 3.510 2005/12/17 Stable

**   Improve trace-on performance on large multi-clock designs by 2x or more.
     This adds a small ~2% performance penalty if traces are compiled in,
     but not turned on.  For best non-tracing performance, do not use --trace.

**** Fixed $'s in specify delays causing bad PLI errors.  [Mat Zeno]

**** Fixed public functions not setting up proper symbol table. [Mat Zeno]

**** Fixed genvars generating trace compile errors.  [Mat Zeno]

**** Fixed VL_MULS_WWW compile error with MSVC++. [Wim Michiels]


* Verilator 3.502 2005/11/30 Stable

**** Fixed local non-IO variables in public functions and tasks.

**** Fixed bad lifetime optimization when same signal is assigned multiple
     times in both branch of a if. [Danny Ding]


* Verilator 3.501 2005/11/16 Stable

***  Add --prof-cfuncs for correlating profiles back to Verilog.

**** Fixed functions where regs are declared before inputs.  [Danny Ding]

**** Fixed bad deep expressions with bit-selects and rotate.  [Prabhat Gupta]


* Verilator 3.500 2005/10/30 Stable

**   Support signed numbers, >>>, $signed, $unsigned.  [MANY!]

**   Support multi-dimensional arrays.  [Eugen Fekete]

**   Add very limited support for the Property Specification Language
     (aka PSL or Sugar).  The format and keywords are now very limited, but will
     grow with future releases.  The --assert switch enables this feature.

**   With --assert, generate assertions for synthesis parallel_case and full_case.

**** Fixed generate if's with empty if/else blocks.  [Mat Zeno]

**** Fixed generate for cell instantiations with same name.  [Mat Zeno]


* Verilator 3.481 2005/10/12 Stable

***  Add /*verilator tracing_on/off*/ for waveform control.

**** Fixed split optimization reordering $display statements.


* Verilator 3.480 2005/9/27 Beta

**   Allow coverage of flattened modules, and multiple points per line.
     Coverage analysis requires SystemPerl 1.230 or newer.

**** Add preprocessor changes to support meta-comments.

**** Optimize sequential assignments of different bits of same bus; ~5% faster.

**** Optimize away duplicate lookup tables.

**** Optimize wide concatenates into individual words.  [Ralf Karge]

**** Optimize local variables from delayed array assignments.


* Verilator 3.470 2005/9/6 Stable

***  Optimize staging flops under reset blocks.

***  Add '-Werror-...' to upgrade specific warnings to errors.

**** Add GCC branch prediction hints on generated if statements.

**** Fixed bad simulation when same function called twice in same expression.

**** Fixed preprocessor substitution of quoted parameterized defines.


* Verilator 3.464 2005/8/24 Stable

***  Add `systemc_imp_header, for use when using --output-split.

***  Add --stats option to dump design statistics.

**** Fixed core dump with clock inversion optimizations.


* Verilator 3.463 2005/8/5 Stable

***  Fixed case defaults when not last statement in case list. [Wim Michiels]


* Verilator 3.462 2005/8/3 Stable

***  Fixed reordering of delayed assignments to same memory index. [Wim Michiels]

**** Fixed compile error with Flex 2.5.1.  [Jens Arm]

**** Fixed multiply-instantiated public tasks generating non-compilable code.


* Verilator 3.461 2005/7/28 Beta

**** Fixed compile error with older versions of bison.  [Jeff Dutton]


* Verilator 3.460 2005/7/27 Beta

**   Add -output-split option to enable faster parallel GCC compiles.
     To support --output-split, the makefiles now split VM_CLASSES
     into VM_CLASSES_FAST and VM_CLASSES_SLOW.  This may require a
     change to local makefiles.

**   Support -v argument to read library files.

***  When issuing unoptimizable warning, show an example path.

**** Fixed false warning when a clock is constant.

**** Fixed X/Z in decimal numbers.  [Wim Michiels]

**** Fixed genvar statements in non-named generate blocks.

**** Fixed core dump when missing newline in `define.  [David van der bokke]

**** Internal tree dumps now indicate edit number that changed the node.


* Verilator 3.450 2005/7/12

**   $finish will no longer exit, but set Verilated::gotFinish().
     This enables support for final statements, and for other cleanup code.
     If this is undesired, redefine the vl_user_finish routine.  Top level
     loops should use Verilated::gotFinish() as a exit condition for their
     loop, and then call top->final().  To prevent a infinite loop, a
     double $finish will still exit; this may be removed in future
     releases.

***  Add support for SystemVerilog keywords $bits, $countones, $isunknown,
     $onehot, $onehot0, always_comb, always_ff, always_latch, finish.

**** Fixed "=== 1'bx" to always be false, instead of random.


* Verilator 3.440 2005/6/28 Stable

**   Add Verilog 2001 generate for/if/case statements.


* Verilator 3.431 2005/6/24 Stable

***  Fixed selection bugs introduced in 3.430 beta.


* Verilator 3.430 2005/6/22 Beta

**   Add Verilog 2001 variable part selects [n+:m] and [n-:m].  [Wim Michiels]


* Verilator 3.422 2005/6/10 Stable

***  Added Verilog 2001 power (**) operator.  [Danny Ding]

**** Fixed crash and added error message when assigning to inputs.  [Ralf Karge]

**** Fixed tracing of modules with public functions.


* Verilator 3.421 2005/6/2 Beta

**** Fixed error about reserved word on non-public signals.

**** Fixed missing initialization compile errors in 3.420 beta. [Ralf Karge]


* Verilator 3.420 2005/6/2 Beta

***  Fixed case defaults when not last statement in case list. [Ralf Karge]

**** Added error message when multiple defaults in case statement.

**** Fixed crash when wire self-assigns x=x.

**   Performance improvements worth ~20%

**   Added -x-assign options; ~5% faster if use -x-assign=0.

**** Optimize shifts out of conditionals and if statements.

**** Optimize local 'short' wires.

**** Fixed gate optimization with top-flattened modules. [Mahesh Kumashikar]


* Verilator 3.411 2005/5/30 Stable

**** Fixed compile error in GCC 2.96.  [Jeff Dutton]


* Verilator 3.410 2005/5/25 Beta

**   Allow functions and tasks to be declared public.
     They will become public C++ functions, with appropriate C++ types.
     This allows users to make public accessor functions/tasks, instead
     of having to use public variables and `systemc_header hacks.

***  Skip producing output files if all inputs are identical
     This uses timestamps, similar to make.  Disable with --no-skip-identical.

**** Improved compile performance with large case statements.

**** Fixed internal error in V3Table.  [Jeff Dutton]

**** Fixed compile error in GCC 2.96, and with SystemC 1.2.  [Jeff Dutton]


* Verilator 3.400 2005/4/29 Beta

**   Internal changes to support future clocking features.

**   Verilog-Perl and SystemPerl are no longer required for C++ or SystemC
     output.  If you want tracing or coverage analysis, they are still needed.

***  Added --sc to create pure SystemC output not requiring SystemPerl.

***  Added --pins64 to create 64 bit SystemC outputs instead of sc_bv<64>.

***  The --exe flag is now required to produce executables inside the makefile.
     This was previously the case any time .cpp files were passed on the
     command line.

***  Added -O3 and --inline-mult for performance tuning.  [Ralf Karge]
     One experiment regained 5% performance, at a cost of 300% in compile time.

***  Improved performance of large case/always statements with low fanin
     by converting to internal lookup tables (ROMs).

***  Initialize SystemC port names.  [S Shuba]

**** Added Doxygen comments to Verilated includes.

**** Fixed -cc pins 8 bits wide and less to be uint8_t instead of uint16_t.

**** Fixed crash when Mdir has same name as .v file.  [Gernot Koch]

**** Fixed crash with size mismatches on case items.  [Gernot Koch]


* Verilator 3.340 2005/2/18 Stable

***  Report misconnected pins across all modules, instead of just first error.

**** Fixed over-active inlining, resulting in compile slowness.

**** Improved large netlist compile times.

**** Added additional internal assertions.


* Verilator 3.332 2005/1/27

***  Added -E preprocess only flag, similar to GCC.

***  Added CMPCONSTLR when comparison is constant due to > or < with all ones.

**** Fixed loss of first -f file argument, introduced in 3.331.


* Verilator 3.331 2005/1/18

**   The Verilog::Perl preprocessor is now C++ code inside of Verilator.
     This improves performance, makes compilation easier, and enables
     some future features.

***  Support arrays of instantiations (non-primitives only). [Wim Michiels]

**** Fixed unlinked error with defparam.  [Shawn Wang]


* Verilator 3.320 2004/12/10

**   NEWS is now renamed Changes, to support CPAN indexing.

***  If Verilator is passed a C file, create a makefile link rule.
     This saves several user steps when compiling small projects.

***  Added new COMBDLY warning in place of fatal error.  [Shawn Wang]

***  Fixed mis-simulation with wide-arrays under bit selects.  [Ralf Karge]

**** Added NC Verilog as alternative to VCS for reference tests.

**** Support implicit wire declarations on input-only signals.
     (Dangerous, as leads to wires without drivers, but allowed by spec.)

**** Fixed compile warnings on Suse 9.1


* Verilator 3.311 2004/11/29

**   Support implicit wire declarations (as a warning).  [Shawn Wang]

**** Fixed over-shift difference in Verilog vs C++.  [Ralf Karge]


* Verilator 3.310 2004/11/15

**   Support defparam.

**   Support gate primitives: buf, not, and, nand, or, nor, xor, xnor.

***  Ignore all specify blocks.


* Verilator 3.302 2004/11/12

***  Support NAND and NOR operators.

***  Better warnings when port widths don't match.

**** Fixed internal error due to some port width mismatches. [Ralf Karge]

**** Fixed WIDTH warnings on modules that are only used
     parameterized, not in 'default' state.

**** Fixed selection of SystemC library on cygwin systems. [Shawn Wang]

**** Fixed runtime bit-selection of parameter constants.


* Verilator 3.301 2004/11/04

**** Fixed 64 bit [31:0] = {#{}} mis-simulation.  [Ralf Karge]

**** Fixed shifts greater then word width mis-simulation.  [Ralf Karge]

**** Work around GCC 2.96 negation bug.


* Verilator 3.300 2004/10/21

**   New backend that eliminates most VL_ macros.
     Improves performance 20%-50%, depending on frequency of use of signals
     over 64 bits. GCC compile times with -O2 shrink by a factor of 10.

**** Fixed "setting unsigned int from signed value" warning.


* Verilator 3.271 2004/10/21

**** Fixed "loops detected" error with some negedge clocks.

**** Cleaned up some output code spacing issues.


* Verilator 3.270 2004/10/15

***  Support Verilog 2001 parameters in module headers. [Ralf Karge]

**** Suppress numeric fault when dividing by zero.

**** Faster code to support compilers not inlining all Verilated functions.


* Verilator 3.260 2004/10/7

**   Support Verilog 2001 named parameter instantiation. [Ralf Karge]

**** Return 1's when one bit wide extract indexes outside array bounds.

**** Fixed compile warnings on 64-bit operating systems.

**** Fixed incorrect dependency in .d file when setting VERILATOR_BIN.


* Verilator 3.251 2004/9/9

**** Fixed parenthesis overflow in Microsoft Visual C++ [Renga Sundararajan]


* Verilator 3.250 2004/8/30

**   Support Microsoft Visual C++ [Renga Sundararajan]

***  SystemPerl 1.161+ is required.


* Verilator 3.241 2004/8/17

**   Support ,'s to separate multiple assignments. [Paul Nitza]

**** Fixed shift sign extension problem using non-GCC compilers.


* Verilator 3.240 2004/8/13

**   Verilator now uses 64 bit math where appropriate.
     Inputs and outputs of 33-64 bits wide to the C++ Verilated model must
     now be uint64_t's; SystemC has not changed, they will remain sc_bv's.
     This increases performance by ~ 9% on x86 machines, varying with how
     frequently 33-64 bit signals occur.  Signals 9-16 bits wide are now
     stored as 16 bit shorts instead of longs, this aids cache packing.

**** Fixed SystemC compile error with feedthrus. [Paul Nitza]

**** Fixed concat value error introduced in 3.230.


* Verilator 3.230 2004/8/10

***  Added coverage output to test_sp example, SystemPerl 1.160+ is required.

**** Fixed time 0 value of signals. [Hans Van Antwerpen]
     Earlier versions would not evaluate some combinatorial signals
     until posedge/negedge blocks had been activated.

**** Fixed wide constant inputs to public submodules [Hans Van Antwerpen]

**** Fixed wide signal width extension bug.
     Only applies when width mismatch warnings were overridden.


* Verilator 3.220 2004/6/22

**   Many waveform tracing changes:

***  Tracing is now supported on C++ standalone simulations. [John Brownlee]

***  When tracing, SystemPerl 1.150 or newer is required.

***  When tracing, Verilator must be called with the --trace switch.

**** Added SystemPerl example to documentation.  [John Brownlee]

**** Various Cygwin compilation fixes.  [John Brownlee]


* Verilator 3.210 2004/4/1

**   Compiler optimization switches have changed
     See the BENCHMARKING section of the documentation.

***  With Verilog-Perl 2.3 or newer, Verilator supports SystemVerilog
     preprocessor extensions.

***  Added localparam. [Thomas Hawkins]

***  Added warnings for SystemVerilog reserved words.


* Verilator 3.203 2004/3/10

***  Notes and repairs for Solaris. [Fred Ma]


* Verilator 3.202 2004/1/27

**   The beta version is now the primary release.  See below for many changes.
     If you have many problems, you may wish to try release 3.125.

***  Verilated::traceEverOn(true) must be called at time 0 if you will ever
     turn on tracing (waveform dumping) of signals.  Future versions will
     need this switch to disable trace incompatible optimizations.

**** Fixed several tracing bugs

**** Added optimizations for common replication operations.


* Verilator 3.201-beta 2003/12/10

**   BETA VERSION, USE 3.124 for stable release!

**   Version 3.2XX includes a all new back-end.
     This includes automatic inlining, flattening of signals between
     hierarchy, and complete ordering of statements.  This results in
     60-300% execution speedups, though less pretty C++ output.  Even
     better results are possible using GCC 3.2.2 (part of Redhat 9.1), as
     GCC has fixed some optimization problems which Verilator exposes.

     If you are using `systemc_ctor, beware pointers to submodules are now
     initialized after the constructor is called for a module, to avoid
     segfaults, move statements that reference subcells into initial
     statements.

***  C++ Constructor that creates a verilog module may take a char* name.
     This name will be used to prefix any $display %m arguments, so users may
     distinguish between multiple Verilated modules in a single executable.


* Verilator 3.125 2004/1/27

**** Optimization of bit replications


* Verilator 3.124 2003/12/05

***  A optimized executable will be made by default, in addition to a debug
     executable.  Invoking Verilator with --debug will pick the debug version.

**** Many minor invisible changes to support the next version.


* Verilator 3.123 2003/11/10

**** Wide bus performance enhancements.

**** Fixed function call bug when width warning suppressed. [Leon Wildman]

**** Fixed __DOT__ compile problem with funcs in last revision. [Leon Wildman]


* Verilator 3.122 2003/10/29

***  Modules which are accessed from external code now must be marked with
     /*verilator public_module*/ unless they already contain public signals.
     To enforce this, private cell names now have a string prepended.

**** Fixed replicated function calls in one statement. [Robert A. Clark]

**** Fixed function call bug when width warning suppressed. [Leon Wildman]


* Verilator 3.121 2003/09/29

***  Support multiplication over 32 bits. [Chris Boumenot]
     Also improved speed of addition and subtraction over 32 bits.

***  Detect bit selection out of range errors.

***  Detect integer width errors.

**** Fixed width problems on function arguments. [Robert A. Clark]


* Verilator 3.120 2003/09/24

***  $finish now exits the model (via vl_finish function).

***  Support inputs/outputs in tasks.

***  Support V2K "integer int = {INITIAL_VALUE};"

***  Ignore floating point delay values.  [Robert A. Clark]

**** Ignore `celldefine, `endcelldefine, etc. [Robert A. Clark]

**** New optimizations on reduction operators.

**** Fixed converting "\ooo" into octal values.

**** Fixed $display("%x");


* Verilator 3.112 2003/09/16

**** Fixed functions in continuous assignments. [Robert A. Clark]

**** Fixed inlining of modules with 2-level deep outputs.


* Verilator 3.111 2003/09/15

**** Fixed declaration of functions before using that module. [Robert A. Clark]

**** Fixed module inlining bug with outputs.


* Verilator 3.110 2003/09/12

**   Support Verilog 2001 style input/output declarations. [Robert A. Clark]

***  Allow local vars in headers of function/tasks. [Leon Wildman]


* Verilator 3.109 2003/08/28

**   Added support for local variables in named begin blocks. [Leon Wildman]


* Verilator 3.108 2003/08/11

**   Added support for functions.

***  Signals 8 bits and shorter are now stored as chars
     instead of uint32_t's.  This improves Dcache packing and
     improves performance by ~7%.

**** $display now usually results in a single VL_PRINT rather then many.

**** Many optimizations involving conditionals (?:)


* Verilator 3.107 2003/07/15

***  --private and --l2name are now the default,
     as this enables additional optimizations.
     Use --noprivate or --nol2name to get the older behavior.

***  Now support $display of binary and wide format data.

***  Added detection of incomplete case statements,
     and added related optimizations worth ~4%.

**** Work around flex bug in Redhat 8.0.  [Eugene Weber]

**** Added some additional C++ reserved words.

**** Additional constant optimizations, ~5% speed improvement.


* Verilator 3.106 2003/06/17

** $c can now take multiple expressions as arguments.
   For example $c("foo","bar(",32+1,");") will insert "foobar(33);"
   This makes it easier to pass the values of signals.

** Several changes to support future versions that may have
   signal-eliminating optimizations.  Users should try to use these switch
   on designs, they will become the default in later versions.

*** Added --private switch and /*verilator public*/ metacomment.
    This renames all signals so that compile errors will result if any
    signals referenced by C++ code are missing a /*verilator public*/
    metacomment.

*** With --l2name, the second level cell C++ cell is now named "v".
    Previously it was named based on the name of the verilog code.  This
    means to get to signals, scope to "{topcell} ->v ->{mysignal}" instead
    of "{topcell} ->{verilogmod}. {mysignal}".  This allows different
    modules to be substituted for the cell without requiring source
    changes.

**** Several cleanups for Redhat 8.0.


* Verilator 3.105 2003/05/08

**** Fixed more GCC 3.2 errors. [David Black]


* Verilator 3.104 2003/04/30

*** Indicate direction of ports with VL_IN and VL_OUT.

*** Allow $c32, etc, to specify width of the $c statement for VCS.

**** Fixed false "indent underflow" error inside `systemc_ctor sections.

**** Fixed missing ordering optimizations when outputs also used internally.

*** Numerous performance improvements, worth about 25%

**** Assign constant cell pins in initial blocks rather then every cycle.

**** Promote subcell's combo logic to sequential evaluation when possible.

**** Fixed GCC 3.2 compile errors.  [Narayan Bhagavatula]


* Verilator 3.103 2003/01/28

**** Fixed missing model evaluation when clock generated several levels of
     hierarchy across from where it is used as a clock.  [Richard Myers]

**** Fixed sign-extension bug introduced in 3.102.


* Verilator 3.102 2003/01/24

**** Fixed sign-extension of X/Z's ("32'hx")


* Verilator 3.101 2003/01/13

**** Fixed 'parameter FOO=#'bXXXX' [Richard Myers]

**** Allow spaces inside numbers ("32'h 1234") [Sam Gladstone]


* Verilator 3.100 2002/12/23

**   Support for simple tasks w/o vars or I/O.  [Richard Myers]

**** Ignore DOS carriage returns in Linux files. [Richard Myers]


* Verilator 3.012 2002/12/18

**** Fixed parsing bug with casex statements containing case items
     with bit extracts of parameters. [Richard Myers]

**** Fixed bug which could cause writes of non-power-of-2 sized arrays to
     corrupt memory beyond the size of the array. [Dan Lussier]

**** Fixed bug which did not detect UNOPT problems caused by
     submodules.  See the description in the verilator man page. [John Deroo]

**** Fixed compile with threaded Perl.  [Ami Keren]


* Verilator 3.010  2002/11/3

*** Support SystemC 2.0.1.  SystemPerl version 1.130 or newer is required.

**** Fixed bug with inlined modules under other inlined modules.  [Scott
     Bleiweiss]


* Verilator 3.005  2002/10/21

**** Fixed X's in case (not casex/z) to constant propagate correctly.

**** Fixed missing include. [Kurachi]


* Verilator 3.004  2002/10/10

*** Added /* verilator module_inline */ and associated optimizations.

*** Allow /* verilator coverage_block_off */ in place of `coverage_block_off.
    This prevents problems with Emacs AUTORESET. [Ray Strouble]

**** Fixed `coverage_block_off also disabling subsequent blocks.

**** Fixed unrolling of loops with multiple simple statements.

**** Fixed compile warnings on newer GCC. [Kurachi]

**** Additional concatenation optimizations.


* Verilator 3.003  2002/09/13

*** Now compiles on Windows 2000 with Cygwin.

**** Fixed bug with pin assignments to wide memories.

**** Optimize wire assignments to constants.


* Verilator 3.002  2002/08/19

** First public release of version 3.


* Verilator 3.000  2002/08/03

** All new code base.  Many changes too numerous to mention.

*** Approximately 4 times faster then Verilator 2.
*** Supports initial statements
*** Supports correct blocking/nonblocking assignments
*** Supports `defines across multiple modules
*** Optimizes call ordering, constant propagation, and dead code elimination.


* Verilator 2.1.8 2002/04/03

** All applications must now link against include/verilated.cpp

*** Paths specified to verilator_make should be absolute, or be formed
   to allow for execution in the object directory (prepend ../ to each path.)
   This allows relative filenames for makes which hash and cache dependencies.

**** Added warning when parameter constants are too large. [John Deroo]

**** Added warning when x/?'s used in non-casez statements.

**** Added warning when blocking assignments used in posedge blocks. [Dan Lussier]

**** Split evaluation function into clocked and non-clocked, 20% perf gain.


* Verilator 2.1.5 2001/12/1

** Added coverage analysis.  In conjunction with SystemC provide line
   coverage reports, without SystemC, provide a hook to user written
   accumulation function.  See --coverage option of verilator_make.

*** Relaxed multiply range checking

*** Support for constants up to 128 bits

*** Randomize values used when assigning to X's.

**** Added -guard option of internal testing.

**** Changed indentation in emitted code to be automatically generated.

**** Fixed corruption of assignments of signal over 32 bits with non-0 lsb.


* Verilator 2.1.4 2001/11/16

** Added $c("c_commands();");  for embedding arbitrary C code in Verilog.


* Verilator 2.1.3 2001/11/03

** Support for parameters.


* Verilator 2.1.2 2001/10/25

** Verilog Errors now reference the .v file rather then the .vpp file.

*** Support strings in assignments:  reg [31:0] foo = "STRG";

*** Support %m in format strings.  Ripped out old $info support, use
    Verilog-Perl's vpm program instead.

*** Convert $stop to call of v_stop() which user can define.

**** Fixed bug where a==b==c would have wrong precedence rule.

**** Fixed bug where XNOR on odd-bit-widths (~^ or ^~) had bad value.


* Verilator 2.1.1 2001/5/17

** New test_sp directory for System-Perl (SystemC) top level instantiation
of the Verilated code, lower modules are still C++ code.  (Experimental).

** New test_spp directory for Pure System-Perl (SystemC) where every module
is true SystemC code.  (Experimental)

*** Input ports are now loaded by pointer reference into the sub-cell.
This is faster on I-386 machines, as the stack must be used when there are
a large number of parameters.  Also, this simplifies debugging as the value
of input ports exists for tracing.

**** Many code cleanups towards standard C++ style conventions.


* Verilator 2.1.0 2001/5/8

**** Many code cleanups towards standard C++ style conventions.


* {Version history lost}


* Verilator 1.8 1996/7/8

** [Versions 0 to 1.8 were by Paul Wasson]

****  Fixed single bit in concat from instance output incorrect offset bug.


* Verilator 1.7 1996/5/20

****  Mask unused bits of DONTCAREs.


* Verilator 1.6 1996/5/13

*** Added fasttrace script


* Verilator 1.5 1996/1/9

*** Pass structure pointer into translated code,
    so multiple instances can use same functions.

**** Fixed static value concat on casex items.


* Verilator 1.1 1995/3/30

*** Bug fixes, added verimake_partial script, performance improvements.


* Verilator 1.0c 1994/9/30

*** Initial release of Verilator


* Verilator 0.0 1994/7/8

**** First code written.

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