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Revision history for Verilator
The contributors that suggested a given feature are shown in []. [by ...]
indicates the contributor was also the author of the fix; Thanks!
* Verilator 3.854 devel
*** Add UNPACKED warning to convert unpacked structs. [Jeremy Bennett]
**** 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]