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Revision history for Verilator
The contributors that suggested a given feature are shown in []. Thanks!
* Verilator 4.107 devel
** Support randomize() class method and rand (#2607). [Krzysztof Bieganski]
*** Support $cast and new CASTCONST warning.
*** Add --top option as alias of --top-module.
**** Report UNUSED on parameters, localparam and genvars (#2627). [Charles Eric LaForest]
**** Add error on real to non-real output pins (#2690). [Peter Monsson]
**** Fix passing parameter type instantiations by position number.
**** Fix DPI open array handling issues.
**** Fix error when dotted refers to missing module (#2095). [Alexander Grobman]
**** Fix little endian packed array counting (#2499). [phantom-killua]
**** Fix showing reference locations for BLKANDNBLK (#2170). [Yuri Victorovich]
**** Fix genblk naming to match IEEE (#2686). [tinshark]
**** Fix vpi_release_handle to be called implicitly per IEEE (#2706).
* Verilator 4.106 2020-12-02
** Change -sv option to select 1800-2017 instead of 1800-2005.
*** Check for proper 'local' and 'protected' (#2228).
*** Support $random and $urandom seeds.
*** Support $monitor and $strobe.
*** Support complex function arguments.
*** Support 'super'.
*** Support 'with item.index'.
**** Fix the default GNU Make executable name on FreeBSD (#2553). [Yuri Victorovich]
**** Fix trace signal names getting hashed (#2643). [Barbara Gigerl]
**** Fix unpacked array parameters near functions (#2639). [Anderson Ignacio da Silva]
**** Fix access to non-overridden base class variable (#2654). [Tobias Rosenkranz]
* Verilator 4.104 2020-11-14
*** Support queue and associative array 'with' statements (#2616).
*** Support queue slicing (#2326).
*** Support associative array pattern assignments and defaults.
*** Support static methods and typedefs in classes (#2615). [Krzysztof Bieganski]
**** Report error on typedef referencing self (#2539). [Cody Piersall]
**** With --debug, turn off address space layout randomization.
**** Fix iteration over mutating list bug in VPI (#2588). [Kaleb Barrett]
**** Fix cast width propagation (#2597). [flex-liu]
**** Fix return from callValueCbs (#2589) (#2605). [Marlon James]
**** Fix WIDTH warnings on comparisons with nullptr (#2602). [Rupert Swarbrick]
**** Fix fault when $fgets, $sscanf, etc used with string (#2604). [Yutetsu TAKATSUKASA]
**** Fix WIFEXITED missing from MinGW/MSYS2 (#2609). [Jean Berniolles]
**** Fix queue poping wrong value when otherwise unused (#2512). [nanduraj1]
**** Fix arrays of modport interfaces (#2614). [Thierry Tambe]
**** Fix split_var internal error (#2640) (#2641). [Yutetsu TAKATSUKASA]
* Verilator 4.102 2020-10-15
**** Support const object new() assignments.
**** Support # as a comment in -f files (#2497). [phantom-killua]
**** Support 'this' (#2585). [Rafal Kapuscik]
**** Support defines for FST tracing (#2592). [Markus Krause]
**** Support |=> inside properties (#1292). [Peter Monsson]
**** Fix timescale with --hierarchical (#2554). [Yutetsu TAKATSUKASA]
**** Fix cmake build with --hierarchical (#2560). [Yutetsu TAKATSUKASA]
**** Fix -G dropping public indication (#2561). [Andrew Goessling]
**** Fix $urandom_range passed variable (#2563). [nanduraj1]
**** Fix method calls to package class functions (#2565). [Peter Monsson]
**** Fix class wide member display (#2567). [Nandu Raj P]
**** Fix hierarchical references inside function (#2267) (#2572). [James Pallister]
**** Fix flushCall for backward compatibility (#2580). [chenguokai]
**** Fix preprocessor stringify of undefined macro. [Martin Whitaker]
* Verilator 4.100 2020-09-07
** C++11 or newer compilers are now required.
** SystemC 2.3.0 or newer (SYSTEMC_VERSION >= 20111121) is now required.
** Support hierarchical Verilation (#2206). [Yutetsu TAKATSUKASA]
**** Support (with limitations) class extern, class extends, virtual class.
**** Support $urandom, $urandom_range without stability.
**** Fix false DECLFILENAME on black-boxed modules (#2430). [Philipp Wagner]
**** Fix naming of "id : begin" blocks.
**** Fix class constructor error on assignments to const.
**** Fix splitting eval functions with --output-split-cfuncs (#2368). [Geza Lore]
**** Fix queues as class members (#2525). [nanduraj1]
**** Add support for assume property. [Peter Monsson]
**** Add support for |=> inside properties (#1292). [Peter Monsson]
* Verilator 4.040 2020-08-15
** Version 4.040 is planned to be the final version that will
support pre-C++11 compilers. Please move to C++11 or newer compilers.
*** Fix arrayed interfaces, broke in 4.038 (#2468). [Josh Redford]
**** Support $stable, $rose and $fell. (#2148) (#2501) [Peter Monsson]
**** Support simple function localparams (#2461). [James Hanlon]
**** Miscellaneous parsing error changes towards UVM support.
**** Fix arrayed interfaces (#2469). [Josh Redford]
**** Fix protect lib VCS warning. (#2479) [Julien Margetts]
**** Fix combining different-width parameters (#2484). [abirkmanis]
**** Fix protect-lib without sequential logic (#2492). [Yutetsu TAKATSUKASA]
**** Fix V3Unknown from running with flat XML output (#2494). [James Hanlon]
**** Fix non-32 bit conversion to float (#2495). [dsvf]
**** Fix casting non-self-determined subexpressions (#2493). [phantom-killua]
**** Fix SystemC net names (#2500). [Edgar E. Iglesias]
**** Fix build with Bison 3.7 and newer (#2505). [Rupert Swarbrick]
**** Fix slice of unpacked array (#2506) (#2507). [Yutetsu TAKATSUKASA]
* Verilator 4.038 2020-07-11
** Versions 4.038 and 4.040 are planned to be the final versions that will
support pre-C++11 compilers. Please move to C++11 or newer compilers.
*** Support VPI access to parameters and localparam. [Ludwig Rogiers]
*** Support parsing (not elaboration, yet) of UVM.
**** Add new UNSUPPORTED error code to replace most previous Unsupported: messages.
**** With --bbox-unsup continue parsing on many (not all) UVM constructs.
**** Support for-loop increments with commas.
**** Support $swrite with arbitrary arguments.
**** Support $writememb (#2450). [Fan Shupei]
**** Fix OS X, Free BSD, and -m32 portability issues. [Geza Lore]
**** Fix to flush FST trace on termination due to $stop or assertion failure.
**** Fix part select error when multipling by power-of-two (#2413). [Conor McCullough]
**** Fix division exception (#2460) [Kuoping Hsu]
* Verilator 4.036 2020-06-06
** OPT_FAST is now -Os by default. See the BENCHMARKING & OPTIMIZATION part
of the manual if you experience issues with compilation speed.
*** Configure now enables SystemC if it is installed as a system headers,
e.g. with 'apt-get install systemc-dev'.
*** Add --waiver-output flag that writes a verilator config file (.vlt) with
waivers to the warnings emitted during a Verilator run.
*** Support verilator_coverage --write-info for lcov HTML reports.
Line Coverage now tracks all statement lines, not just branch lines.
*** --output-split is now on by default. VM_PARALLEL_BUILDS is set by
default iff the --output-split caused an actual file split to occur.
--output-split-cfuncs and --output-split-ctrace now default to the
value of --output-split. These changes should improve build times of
medium and large designs with default options. User makefiles may
require changes.
*** The run-time library is now compiled with -Os by default. (#2369, #2373)
**** Support multi channel descriptor I/O (#2190) [Stephen Henry]
**** Support $countbits. (#2287) [Yossi Nivin]
**** Support $isunbounded and parameter $. (#2104)
**** Support unpacked array .sum and .product.
**** Support prefix/postfix increment/decrement. (#2223) [Maciej Sobkowski]
**** Fix FST tracing of little bit endian signals. [Geza Lore]
**** Fix +: and -: on unpacked arrays. (#2304) [engr248]
**** Fix $isunknown with constant Z's.
**** Fix queues and dynamic array wide ops. (#2352) [Vassilis Papaefstathiou]
* Verilator 4.034 2020-05-03
** Add simplistic class support with many restrictions, see manual. (#377)
** Support IEEE time units and time precisions. (#234)
Includes `timescale, $printtimescale, $timeformat.
VL_TIME_MULTIPLIER, VL_TIME_PRECISION, VL_TIME_UNIT have been removed
and the time precision must now match the SystemC time precision. To
get closer behavior to older versions, use e.g. --timescale-override
"1ps/1ps".
** Add --build to call make automatically. (#2249) [Yutetsu TAKATSUKASA]
** Configuring with ccache present now defaults to using it; see OBJCACHE.
** Fix DPI import/export to be standard compliant. (#2236) [Geza Lore]
** Add --trace-threads for general multithreaded tracing. (#2269) [Geza Lore]
*** Add --flatten for use with --xml-only. (#2270) [James Hanlon]
**** Greatly improve FST/VCD dump performance (#2244) (#2246) (#2250) (#2257) [Geza Lore]
**** Support $ferror, and $fflush without arguments. (#1638)
**** Support event data type (with some restrictions).
**** Support $root. (#2150) [Keyi Zhang]
**** Add error if use SystemC 2.2 and earlier (pre-2011) as is deprecated.
**** Fix build of fast path tracing code to use OPT_FAST. (#2245) [Geza Lore]
**** Fix arrayed instances connecting to slices. (#2263) [Don/engr248]
**** Fix error on unpacked connecting to packed. (#2288) [Joseph Shaker]
**** Fix logical not optimization with empty begin. (#2291) [Baltazar Ortiz]
**** Fix reduction OR on wide data, broke in v4.026. (#2300) [Jack Koenig]
**** Fix clock enables with bit-extends. (#2299) [Marco Widmer]
**** Fix MacOs Homebrew by removing default LIBS. (#2298) [Ryan Clarke]
* Verilator 4.032 2020-04-04
*** Add column numbers to errors and warnings.
*** Add GCC 9-style line number prefix when showing source text for errors.
*** Add setting VM_PARALLEL_BUILDS=1 when using --output-split. (#2185)
*** Change --quiet-exit to also suppress 'Exiting due to N errors'.
**** Suppress REALCVT for whole real numbers.
**** Support split_var in vlt files. (#2219) [Marco Widmer]
**** Fix parameter type redeclaring a type. (#2195) [hdzhangdoc]
**** Fix VCD open with empty filename. (#2198) [Julius Baxter]
**** Fix packages as enum base types. (#2202) [Driss Hafdi]
**** Fix duplicate typedefs in generate for. (#2205) [hdzhangdoc]
**** Fix MinW portability. (#2114) [Sean Cross]
**** Fix assertions with unique case inside. (#2199) [hdzhangdoc]
**** Fix implicit conversion of floats to wide integers.
* Verilator 4.030 2020-03-08
** Add split_var metacomment to assist UNOPTFLAT fixes. (#2066) [Yutetsu TAKATSUKASA]
** Add support for $dumpfile and $dumpvars. (#2126) [Alexander Grobman]
** Add support for dynamic arrays. (#379)
*** Add +verilator+noassert flag to disable assertion checking. [Tobias Wölfel]
*** Add check for assertOn for asserts. (#2162) [Tobias Wölfel]
*** Add --structs-packed for forward compatibility.
*** Fix genblk naming with directly nested generate blocks. (#2176) [Alexander Grobman]
**** Implement $displayb/o/h, $writeb/o/h, etc. (#1637)
**** Use gcc -Os in examples instead of -O2 for better average performance.
**** Fix undeclared VL_SHIFTR_WWQ. (#2114) [Alex Solomatnikov]
* Verilator 4.028 2020-02-08
** Support attributes (public, isolate_assignments, etc.) in configuration files.
** Add -match to lint_off to waive warnings. [Philipp Wagner]
*** Link Verilator binary partially statically. (#2146) [Geza Lore]
*** Verilation speed improvements (#2133) (#2138) [Geza Lore]
*** Support libgoogle-perftools-dev's libtcmalloc if available. (#2137) [Geza Lore]
*** Support $readmem/$writemem with assoc arrarys. (#2100) [agrobman]
**** Support type(expression) operator and $typename. (#1650)
**** Support left justified $display. (#2101) [Pieter Kapsenberg]
**** Support string character access via indexing.
**** Support enum.next(k) with constant k > 1. (#2125) [Tobias Rosenkranz]
**** Support parameter access from arrays of interfaces. (#2155) [Todd Strader]
**** Add parameter values in XML. #2110. [Pieter Kapsenberg]
**** Add loc column location in XML (replaces fl). (#2122) [Pieter Kapsenberg]
**** Add error on misused define. [Topa Tota]
**** Add parameter to set maximum signal width. (#2082) [Øyvind Harboe]
**** Add warning on genvar in normal for loop. (#2143) [yurivict]
**** Fix VPI scope naming for public modules. [Nandu Raj]
**** Fix FST tracing of enums inside structs. [fsiegle]
**** Fix WIDTH warning on </<= of narrower value. (#2141) [agrobman]
**** Fix OpenSolaris issues. (#2154) [brancoliticus]
**** Fix gated clocks under --protect-lib. (#2169) [Todd Strader]
* Verilator 4.026 2020-01-11
** Docker images are now available for Verilator releases.
*** Support bounded queues.
*** Support implication operator "|->" in assertions. (#2069) [Peter Monsson]
*** Support string compare, ato*, etc methods. (#1606) [Yutetsu TAKATSUKASA]
**** Support immediate cover statements.
**** Ignore `uselib to end-of-line. (#1634) [Frederic Antonin]
**** Update FST trace API for better performance.
**** Add vpiTimeUnit and allow to specify time as string. (#1636) [Stefan Wallentowitz]
**** Add error when `resetall inside module (IEEE 2017-22.3).
**** Add cleaner error on version control conflicts in sources.
**** Fix little endian cell ranges. (#1631) [Julien Margetts]
**** Fix queue issues (#1641) (#1643) [Peter Monsson, Stefan Wallentowitz]
**** Fix strcasecmp for windows. (#1651) [Kuba Ober]
**** Fix disable iff in assertions. Closes #1404. [Peter Monsson]
**** Fix huge case statement performance. Closes #1644. [Julien Margetts]
**** Fix tracing -1 index arrays. Closes #2090. [Yutetsu Takatsukasa]
**** Fix expand optimization slowing --lint-only. Closes #2091. [Thomas Watts]
**** Fix %{number}s with strings. #2093. [agrobman]
**** Fix shebang breaking some shells. Closes #2067. [zdave]
* Verilator 4.024 2019-12-08
** Support associative arrays (excluding [*] and pattern assignments). (#544)
** Support queues (excluding {} notation and pattern assignments). (#545)
*** Add +verilator+error+limit to see more assertion errors. [Peter Monsson]
*** Support string.toupper and string.tolower.
*** Support $rewind and $ungetc.
*** Support shortreal as real, with a SHORTREAL warning.
**** Add -Wpedantic and -Wno-context for compliance testing.
**** Add error on redefining preprocessor directives. [Piotr Binkowski]
**** Support $value$plusargs float and shorts. (#1592) (#1619) [Garrett Smith]
**** Fix gate lvalue optimization error. (#831) [Jonathon Donaldson, Driss Hafdi]
**** Fix color assertion on empty if. (#1604) [Andrew Holme]
**** Fix for loop missing initializer. (#1605) [Andrew Holme]
**** Fix hang on concat error. (#1608) [Bogdan Vukobratovic]
**** Fix VPI timed callbacks to be one-shot, pull5. [Matthew Ballance]
**** Fix // in filenames. (#1610) [Peter Nelson]
**** Fix $display("%p") to be closer to IEEE.
**** Fix labels on functions with returns. (#1614) [Mitch Hayenga]
**** Fix false unused message on __Vemumtab. (#2061) [Tobias Rosenkranz]
**** Fix assertion on dotted parameter arrayed function. (#1620) [Rich Porter]
**** Fix interface reference tracing. (#1595) [Todd Strader]
**** Fix error on unpacked concatenations. (#1627) [Driss Hafdi]
* Verilator 4.022 2019-11-10
** Add --protect-lib. (#1490) [Todd Strader]
** Add cmake support. (#1363) [Patrick Stewart]
*** Examples have been renamed.
*** Add --protect-ids to obscure information in objects. (#1521) [Todd Strader]
*** Add --trace-coverage.
*** Add --xml-output.
*** Support multithreading on Windows. [Patrick Stewart]
*** Suppress 'command failed' on normal errors.
*** Support some unpacked arrays in parameters. (#1315) [Marshal Qiao]
*** Add interface port visibility in traces. (#1594) [Todd Strader]
**** Increase case duplicate/incomplete to 16 bit tables. (#1545) [Yossi Nivin]
**** Support quoted arguments in -f files. (#1535) [Yves Mathieu]
**** Optimize modulus by power-of-two constants, and masked conditionals.
**** Fix detecting missing reg types. (#1570) [Jacko Dirks]
**** Fix multithreaded yield behavior when no work. [Patrick Stewart]
**** Fix bad-syntax crashes. (#1548, #1550-#1553, #1557-#1560, #1563,
#1573-#1577, #1579, #1582-#1591) [Eric Rippey]
**** Fix false CMPCONST/UNSIGNED warnings on "inside". (#1581) [Mitch Hayenga]
* Verilator 4.020 2019-10-06
*** Add --public-flat-rw. (#1511) [Stefan Wallentowitz]
*** Support $fseek, $ftell, $frewind. (#1496) [Howard Su]
*** Support vpiModule. (#1469) [Stefan Wallentowitz]
**** Make Syms file honor --output-split-cfuncs. (#1499) [Todd Strader]
**** Fix make test with no VERILATOR_ROOT. (#1494) [Ahmed El-Mahmoudy]
**** Fix error on multidimensional cells. (#1505) [Anderson Ignacio Da Silva]
**** Fix config_rev revision detection on old versions.
**** Fix false warning on backward indexing. (#1507) [Hao Shi]
**** Fix vpiType accessor. (#1509) (#1510) [Stefan Wallentowitz]
**** Fix ugly error on interface misuse. (#1525) [Bogdan Vukobratovic]
**** Fix misc bad-syntax crashes. (#1529) (#1530) (#1531) (#1532) (#1533) [Eric Rippey]
**** Fix case statements with strings. (#1536) [Philipp Wagner]
**** Fix some coverage lost when multithreaded. (#2151)
* Verilator 4.018 2019-08-29
** When showing an error, show source code and offer suggestions of replacements.
** When showing an error, show the instance location. (#1305) [Todd Strader]
*** Add --rr. (#1481) [Todd Strader]
*** Change MULTITOP to warning to help linting, see manual.
*** Add XSim support to driver.pl. (#1493) [Todd Strader]
**** Show included-from filenames in warnings. (#1439) [Todd Strader]
**** Fix elaboration time errors. (#1429) [Udi Finkelstein]
**** Fix not reporting some duplicate signals/ports. (#1462) [Peter Gerst]
**** Fix not in array context on non-power-of-two slices. (#2027) [Yu Sheng Lin]
**** Fix system compile flags injection. [Gianfranco Costamagna]
**** Fix enum values not being sized based on parent. (#1442) [Dan Petrisko]
**** Fix internal error on gate optimization of assign. (#1475) [Oyvind Harboe]
**** Add --dpi-hdr-only. (#1491) [Todd Strader]
* Verilator 4.016 2019-06-16
*** Add --quiet-exit. (#1436) [Todd Strader]
**** Error continuation lines no longer have %Error prefix.
**** Support logical equivalence operator <->.
**** Support VerilatedFstC set_time_unit. (#1433) [Pieter Kapsenberg]
**** Support deferred assertions. (#1449) [Charles Eddleston]
**** Mark infrequently called functions with GCC cold attribute.
**** Fix sign-compare warning in verilated.cpp. (#1437) [Sergey Kvachonok]
**** Fix fault on $realtime with %t. (#1443) [Julien Margetts]
**** Fix $display with string without %s. (#1441) [Denis Rystsov]
**** Fix parameter function string returns. (#1441) [Denis Rystsov]
**** Fix invalid XML output due to special chars. (#1444) [Kanad Kanhere]
**** Fix performance when mulithreaded on 1 CPU. (#1455) [Stefan Wallentowitz]
**** Fix type and real parameter issues (#1427) (#1456) (#1458) [Todd Strader]
**** Fix build error on MinGW. (#1460) [Richard Myers]
**** Fix not reporting some duplicate signals. (#1462) [Peter Gerst]
**** Fix --savable invalid C++ on packed arrays. (#1465) [Alex Chadwick]
**** Fix constant function return of function var. (#1467) [Roman Popov]
* Verilator 4.014 2019-05-08
*** Add --trace-fst-thread.
**** Support '#' comments in $readmem. (#1411) [Frederick Requin]
**** Support "'dx" constants. (#1423) [Udi Finkelstein]
**** For FST tracing use LZ4 compression. [Tony Bybell]
**** Add error when use parameters without value. (#1424) [Peter Gerst]
**** Auto-extend and WIDTH warn on unsized X/Zs. (#1423) [Udi Finkelstein]
**** Fix missing VL_SHIFTL_ errors. (#1412) (#1415) [Larry Lee]
**** Fix MinGW GCC 6 printf formats. (#1413) [Sergey Kvachonok]
**** Fix test problems when missing fst2vcd. (#1417) [Todd Strader]
**** Fix GTKWave register warning. (#1421) [Pieter Kapsenberg]
**** Fix FST enums not displaying. (#1426) [Danilo Ramos]
**** Fix table compile error with multiinterfaces. (#1431) [Bogdan Vukobratovic]
* Verilator 4.012 2019-03-23
*** Add +verilator+seed. (#1396) [Stan Sokorac]
*** Support $fread. [Leendert van Doorn]
*** Support void' cast on functions called as tasks. (#1383) [Al Grant]
*** Add IGNOREDRETURN warning. (#1383)
**** Report PORTSHORT errors on concat constants. (#1400) [Will Korteland]
**** Fix VERILATOR_GDB being ignored. (#2017) [Yu Sheng Lin]
**** Fix $value$plus$args missing verilated_heavy.h. [Yi-Chung Chen]
**** Fix MSVC compile error. (#1406) [Benjamin Gartner]
**** Fix maintainer test when no Parallel::Forker. (#1977) [Enzo Chi]
**** Fix +1364-1995ext flags applying too late. (#1384) [Al Grant]
* Verilator 4.010 2019-01-27
*** Removed --trace-lxt2, use --trace-fst instead.
**** For --xml, add additional information. (#1372) [Jonathan Kimmitt]
**** Add circular typedef error. (#1388) [Al Grant]
**** Add unsupported for loops error. (#1986) [Yu Sheng Lin]
**** Fix FST tracing of wide arrays. (#1376) [Aleksander Osman]
**** Fix error when pattern assignment has too few elements. (#1378) [Viktor Tomov]
**** Fix error when no modules in $unit. (#1381) [Al Grant]
**** Fix missing too many digits warning. (#1380) [Jonathan Kimmitt]
**** Fix uninitialized data in verFiles and unroller. (#1385) (#1386) [Al Grant]
**** Fix internal error on xrefs into unrolled functions. (#1387) [Al Grant]
**** Fix DPI export void compiler error. (#1391) [Stan Sokorac]
* Verilator 4.008 2018-12-01
*** Support "ref" and "const ref" pins and functions. (#1360) [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. (#1369) [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. (#1990) [HyungKi Jeong]
**** Fix hang on bad pattern keys. (#1364) [Matt Myers]
**** Fix crash due to cygwin bug in getline. (#1349) [Affe Mao]
**** Fix __Slow files getting compiled with OPT_FAST. (#1370) [Thomas Watts]
* Verilator 4.006 2018-10-27
** Add --pp-comments. (#1988) [Robert Henry]
** Add --dump-defines.
*** For --trace-fst, save enum decoding information. (#1358) [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. (#1361) [Patrick Stewart]
* Verilator 4.004 2018-10-06
** Add GTKWave FST native tracing. (#1356) [Sergi Granell]
(Verilator developers need to pull the latest vcddiff.)
*** Support $past. [Dan Gisselquist]
*** Support restrict. (#1350) [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. (#1348) [Kevin Kiningham]
**** Fix MinGW compile issues. (#1979) [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. (#1333) [Yu Sheng Lin]
** Note $random has new algorithm; results may vary vs. previous versions.
*** Better optimize large always block splitting. (#1244) [John Coiner]
*** Add new reloop optimization for repetitive assignment compression.
*** Support string.atoi and similar methods. (#1289) [Joel Holdsworth]
**** Fix internals to be C++ null-pointer-check clean.
**** Fix internals to avoid 'using namespace std'.
**** Fix Verilation performance issues. (#1316) [John Coiner]
**** Fix clocker attributes to not propagate on concats. [John Coiner]
**** Fix first clock edge and --x-initial-edge. (#1327) [Rupert Swarbrick]
**** Fix compile error on tracing of string arrays. (#1338) [Iztok Jeras]
**** Fix number parsing with newline after radix. (#1340) [George Cuan]
**** Fix string ?: conditional type resolution. (#1345) [Iztok Jeras]
**** Fix duplicate symbol error on generate tri. (#1347) [Tomas Dzetkulic]
* Verilator 3.926 2018-08-22
**** Add OBJCACHE envvar support to examples and generated Makefiles.
**** Change MODDUP errors to warnings. (#1969) [Marshal Qiao]
**** Fix define argument stringification (`"), broke since 3.914. [Joe DErrico]
**** Fix to ignore Unicode UTF-8 BOM sequences. (#1967) [HyungKi Jeong]
**** Fix std:: build error. (#1322)
**** Fix function inlining inside certain while loops. (#1330) [Julien Margetts]
* Verilator 3.924 2018-06-12
*** Renamed --profile-cfuncs to --prof-cfuncs.
**** Report interface ports connected to wrong interface. (#1294) [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 #. (#1308) [Dan Kirkham]
**** Fix $clog2 to be in verilog 2005. (#1319) [James Hutchinson]
* Verilator 3.922 2018-03-17
** Support IEEE 1800-2017 as default language.
*** Support trig functions ($sin() etc). (#1281) [Patrick Stewart]
*** Support calling system functions as tasks. (#1285) [Joel Holdsworth]
*** Support assert properties. (#785) (#1290) [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. (#1273)
**** Fix pullup/pulldowns on bit selects. (#1274) [Rob Stoddard]
**** Fix verilator_coverage --annotate-min. (#1284) [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'. (#1269) [Dan Gisselquist]
**** Fix tracing example file output. (#1268) [Enzo Chi]
**** Fix gate optimization out of memory, add --gate-stmts. (#1260) [Alex Solomatnikov]
**** Fix compile error on public real parameters by suppressing. (#1261) [Alex Solomatnikov]
**** Fix input-only tristate comparisons. (#1267) [Alexis G]
**** Fix missing edge type in xml output. (#1955) [Alexis G]
**** Fix compile error with --public and interface bind. (#1264) [Alexis G]
**** Remove c++filt. (#1265) [Stefan Wallentowitz]
* Verilator 3.918 2018-01-02
*** Workaround GCC/clang bug with huge compile times. (#1248)
*** Support DPI open arrays. (#909) (#1245) [David Pierce, Victor Besyakov]
*** Add INFINITELOOP warning. (#1254) [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. (#1251) [Tymoteusz Blazejczyk]
**** Fix modport outputs being treated as inputs. (#1246) [Jeff Bush]
**** Fix false ALWCOMBORDER on interface references. (#1247) [Josh Redford]
**** Fix constant propagation across DPI imports of inout strings. [Victor Besyakov]
**** Fix resolving inline nested interface names. (#1250) [Arjen Roodselaar]
**** Fix GCC false warning on array bounds. (#2386)
* Verilator 3.916 2017-11-25
*** Support self-recursive modules. (#659) [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. (#1110) [Trevor Elbourne]
*** Add BSSPACE and COLONPLUS lint warnings.
**** Detect MSB overflow when under VL_DEBUG. (#1238) [Junyi Xi]
**** Add data types to --xml. [Rui Terra]
**** Fix partial slicing with pattern assignments. (#991) [Johan Bjork]
**** Fix false unused warning on interfaces. (#1241) [Laurens van Dam]
**** Fix error on "unique case" with no cases.
**** Fix MacOS portability. (#1232) [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. (#1224) [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. (#1223) [John Coiner]
**** Fix Ubuntu 17.10 issues. (#1223 partial). [John Coiner]
**** Fix compiler warning when WIDTH warning ignored on large compare.
**** Fix memory leak in VerilatedVcd dumps. (#1222 partial) [Shareef Jalloq]
**** Fix unnecessary Vdly variables. (#1224 partial) [John Coiner]
**** Fix conditional slices and add related optimizations.
**** Fix `` expansion of `defines. (#1225) (#1227) (#1228) [Odd Magne Reitan]
**** Fix -E duplicating output. (#1226) [Odd Magne Reitan]
**** Fix float-conversion warning. (#1229) [Robert Henry]
**** Fix MacOS portability. (#1230) (#1231) [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. (#1210) [Mike Popoloski]
*** Support package export. (#1217) [Usuario Eda]
*** Fix ordering of arrayed cell wide connections. (#1202 partial) [Mike Popoloski]
**** Support module port parameters without defaults. (#1213) [Mike Popoloski]
**** Add performance information to --stats file.
**** Simplify VL_CONST_W macro generation for faster compiles.
**** Fix LITENDIAN warning on arrayed cells. (#1202) [Mike Popoloski]
**** Fix enum ranges without colons. (#1204) [Mike Popoloski]
**** Fix GCC noreturn compile error. (#1209) [Mike Popoloski]
**** Fix constant function default parameters. (#1211) [Mike Popoloski]
**** Fix non-colon array of interface modports. (#1212) [Mike Popoloski]
**** Fix .name connections on interfaces. (#1214) [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. (#1180) [Arthur Kahlich]