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121 Commits

Author SHA1 Message Date
Geza Lore
39d903375b
Factor out trace implementation common to all formats. (#2268) 
This patch de-duplicates common functionality between the VCD and FST
trace implementation. It also enables adding new trace formats more
easily and consistently.

No functional nor performance change intended.
 2020-04-19 23:57:36 +01:00
Wilson Snyder
d4f7f5297a
Support IEEE time units and time precisions, #234. (#2253) 
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".
 2020-04-15 19:39:03 -04:00
Geza Lore
dc5c259069
Improve tracing performance. (#2257) 
* Improve tracing performance.

Various tactics used to improve performance of both VCD and FST tracing:
- Both: Change tracing functions to templates to take variable widths as
  template parameters. For VCD, subsequently specialize these to the
  values used by Verilator. This avoids redundant instructions and hard
  to predict branches.
- Both: Check for value changes via direct pointer access into the
  previous signal value buffer. This eliminates a lot of simple pointer
  arithmetic instructions form the tracing code.
- Both: Verilator provides clean input, no need to mask out used bits.
- VCD: pre-compute identifier codes and use memory copy instead of
  re-computing them every time a code is emitted. This saves a lot of
  instructions and hard to predict branches. The added D-cache misses
  are cheaper than the removed branches/instructions.
- VCD: re-write the routines emitting the changes to be more efficient.
- FST: Use previous signal value buffer the same way as the VCD tracing
  code, and only call the FST API when a change is detected.

Performance as measured on SweRV EH1, with the pre-canned CoreMark
benchmark running from DCCM/ICCM, clang 6.0.0, Intel i7-3770 @ 3.40GHz,
and IO to ramdisk:

            +--------------+---------------+----------------------+
            | VCD          | FST           | FST separate thread  |
            | (--trace)    | (--trace-fst) | (--trace-fst-thread) |
------------+-----------------------------------------------------+
Before      |  30.2 s      | 121.1 s       |  69.8 s              |
============+==============+===============+======================+
After       |  24.7 s      |  45.7 s       |  32.4 s              |
------------+--------------+---------------+----------------------+
Speedup     |    22 %      |   256 %       |   215 %              |
------------+--------------+---------------+----------------------+
Rel. to VCD |     1 x      |  1.85 x       |  1.31 x              |
------------+--------------+---------------+----------------------+

In addition, FST trace size for the above reduced by 48%.
 2020-04-14 00:13:10 +01:00
Geza Lore
05f213c266
VCD tracing speed improvements (#2246) 
* Don't inline VCD dump functions

Improves model speed with tracing. Measured on SweRW cmark:
- GCC 5.5      ~3% faster
- Clang 6.0    ~12% faster (!)

* Remove redundant test from VCD bit tracing.

Improves model speed with tracing. Measured on SweRW cmark:
 - GCC 5.5      ~7.5% faster
 - Clang 6.0    ~1.5% faster
 2020-04-09 08:19:26 -04:00
Wilson Snyder
e07e9390f6 Internals: clang-format cleanups. No functional change. 2020-04-04 14:09:21 -04:00
Wilson Snyder
a13eab55f5 Internals: Add missing VL_DO_CLEARs. No functional change. 2020-04-04 13:06:31 -04:00
Wilson Snyder
38a31ae168 Cleanup misc clang-tidy warnings. No functional change intended 2020-04-03 22:31:54 -04:00
Wilson Snyder
08a51e3e09 Fix VCD open with empty filename, #2198. 2020-03-24 17:32:47 -04:00
Wilson Snyder
1ce360ed5b Add SPDX license identifiers. No functional change. 2020-03-21 11:24:24 -04:00
Wilson Snyder
6c6d70a5e5 Fix FST when multi-model tracing. 2020-03-07 18:39:58 -05:00
Wilson Snyder
30a33a6104 Add support for and , #2126. 2020-03-01 21:39:23 -05:00
Wilson Snyder
0ca0e07354 Internals: Vcd doesn't need code when registering. No functional change intended. 2020-02-29 20:42:52 -05:00
Wilson Snyder
9978cbfa5c Fix tracing -1 index arrays. Closes #2090. 2020-01-08 07:32:31 -05:00
Wilson Snyder
f23fe8fd84 Update copyright year. 2020-01-06 18:05:53 -05:00
Wilson Snyder
35e9489f33 Includes: Allow VCD trace of 64 bit array. 2019-12-05 22:25:30 -05:00
Maarten De Braekeleer
977a767477 Avoid tabs in C output. 
Signed-off-by: Wilson Snyder <wsnyder@wsnyder.org>
 2019-10-04 21:10:53 -04:00
Wilson Snyder
6ffbb7cabf Internals: Remove extra semicolons. No functional change. 2019-06-11 18:31:06 -04:00
Wilson Snyder
96c70ea2df Internals: Fix some long lines in include files. No functional change. 
When merging, recommend using "git merge -Xignore-all-space"
 2019-05-14 22:49:32 -04:00
Wilson Snyder
8a4aeddbb0 Copyright year update. 2019-01-03 19:17:22 -05:00
Wilson Snyder
304a24d03a Internals: Fix many clang-tidy issues. No functional change intended. 2018-10-14 18:39:33 -04:00
Wilson Snyder
595419b370 Internals: Sort includes for clang-tidy. No functional change intended. 2018-10-14 07:04:18 -04:00
Wilson Snyder
e8b8b33ff6 Internals: Cleanup find with chars for clang-tidy. No functional change. 2018-10-13 22:28:59 -04:00
Wilson Snyder
f8ae08c0c2 Internals: Fix whitespace. 2018-10-02 06:31:11 -04:00
Wilson Snyder
4684f1d4cc Include sys/types to make sure __WORDSIZE is set, bug1333. 2018-08-31 06:52:12 -04:00
Wilson Snyder
3ed8d968ff Commentary and spacing. No functional change. 2018-08-28 06:30:30 -04:00
Wilson Snyder
0b84222500 Includes: Fix spacing and style in prep for new LXT2. No functional change. 2018-08-22 19:14:06 -04:00
Wilson Snyder
0eb1d0a84e Fix cppcheck warnings. No functional change intended. 2018-06-14 18:59:24 -04:00
Wilson Snyder
02a22c12ea Internals: Add missing [] to delete call in verilated_vcd_c.cpp, bug1309 2018-05-17 07:08:11 -04:00
Wilson Snyder
fe917ba7f4 include: Merge misc thread runtime support. 2018-05-13 19:30:51 -04:00
Wilson Snyder
770045676f Internals: Split some extremely long lines. No functional change. 2018-03-10 16:32:04 -05:00
Wilson Snyder
8e65d93d6d Copyright year update. No functional change. 2018-01-02 18:05:06 -05:00
Wilson Snyder
add5cc8b56 Internals: Add VL_UNCOPYABLE to make classes uncopyable. No functional change intended. 2017-11-01 18:51:41 -04:00
Wilson Snyder
f91bac7b31 Rewrite include libraries to support VL_THREADED towards future threading 2017-10-26 21:51:51 -04:00
Wilson Snyder
5ead61dc7b Unify format of VL_DEBUG print messages 2017-10-24 22:56:58 -04:00
Wilson Snyder
32874fa848 Internals: Misc VCD code cleanups. No functional change. 2017-10-21 17:53:23 -04:00
Wilson Snyder
f4b00d3c64 Call VL_PRINTF/vl_stop/vl_finish/vl_fatal through wrappers as hook for future MT use. 2017-10-19 19:40:51 -04:00
Wilson Snyder
d21824cbae Internals: Refactor verilated_vcd to move singleton into only .cpp. No functional change intended. 2017-10-14 13:00:25 -04:00
Wilson Snyder
de35c90847 Fix float-conversion warning, bug1229. 2017-10-11 19:01:37 -04:00
Wilson Snyder
ac4690d74b Internals: Add const's. No functional change 2017-10-10 22:22:17 -04:00
Wilson Snyder
0ac116bb4e Internals: Favor C++ cast style. No functional change intended. 2017-10-07 15:01:19 -04:00
Wilson Snyder
89ac6ab594 Fix memory leak in VerilatedVcd dumps, bug1222 partial. 2017-10-02 18:49:00 -04:00
Wilson Snyder
3f14e649b5 Internals: Use singleton in place of global 2017-09-23 07:44:52 -04:00
Wilson Snyder
c2e8062f84 Verilated headers no longer "use namespace std;" 2017-09-23 07:32:37 -04:00
Wilson Snyder
074689b5de SystemPerl mode (-sp-deprecated) has been removed. 2017-09-07 21:08:49 -04:00
Wilson Snyder
70daadf987 Fix cpp-check warnings; support XML format 2 2017-07-06 20:25:59 -04:00
Wilson Snyder
e6d7e7e329 Version bump 2017-01-15 12:13:13 -05:00
Wilson Snyder
b738d1960a Copyright year update 2016-01-06 20:36:41 -05:00
Wilson Snyder
1891cfd79a Fix rounding in trace , bug946. 2015-07-21 13:22:08 -04:00
Wilson Snyder
c0df07c86f Commentary: Update contributor list 2015-03-13 07:38:17 -04:00
Wilson Snyder
a0fd065dcf Add VerilatedVcdFile to allow real-time waveforms, bug890. 2015-03-05 08:54:57 -05:00
Wilson Snyder
8323092a0c Fix cppcheck warnings. No functional change. 2015-02-09 21:05:27 -05:00
Wilson Snyder
4c91ade61d Copyright year update 2015-01-07 18:25:53 -05:00
Wilson Snyder
d33ad7600b Commentary. Cleanup stale SystemPerl references. 2014-11-23 22:00:00 -05:00
Wilson Snyder
3234fa15ef Fix trace overflow on huge arrays, bug834. 2014-11-05 22:22:27 -05:00
Wilson Snyder
27af9b6b06 Fix clang warnings, bug818. 2014-09-11 21:28:53 -04:00
Wilson Snyder
6cf50e6579 Fix string corruption, bug780. 2014-06-08 21:36:18 -04:00
Wilson Snyder
4422de0c6c Copyright year update. 2014-01-06 19:28:57 -05:00
Wilson Snyder
e6808a787c Fix opening a VerilatedVcdC file multiple times, msg1021. 2013-02-23 21:10:25 -05:00
Wilson Snyder
f07f6a26a8 cppcheck fixes 2013-02-03 13:27:37 -05:00
Wilson Snyder
a8bbf7231b Copyright year update. 2013-01-01 09:42:59 -05:00
Wilson Snyder
50edef4ab2 Add Emacs indentation line. No functional change 2012-04-12 21:08:20 -04:00
Wilson Snyder
c2c7c7bd9a Copyright year update 2012-01-15 10:26:28 -05:00
Wilson Snyder
71c1f00ec2 Copyright year update 2011-01-01 18:21:19 -05:00
Wilson Snyder
57d00946be Fix MSVC compile issues 2010-04-10 06:46:24 -04:00
Wilson Snyder
ef51de72c9 Fix word size to match uint64_t on -m64 systems, bug238. 2010-04-09 21:51:15 -04:00
Wilson Snyder
495585830d Fix trace files with empty modules crashing some viewers. 2010-03-22 18:38:24 -04:00
Wilson Snyder
d780d0aabb Fix flushing VCD buffers on . 2010-03-12 20:00:08 -05:00
Wilson Snyder
e40fbf1470 Verilated: Add missing VL_UNLIKELYs 2010-02-03 06:56:20 -05:00
Wilson Snyder
2fd5a6d47f Internals: enum size doesn't apply to non-SystemPerl 2010-02-01 18:37:18 -05:00
Wilson Snyder
8dca56521b Fix MinGW compilation printing %lls, bug214 2010-02-01 09:28:53 -05:00
Wilson Snyder
11e702c430 SystemPerl is no longer required for tracing. 
Applications must use VerilatedVcdC class in place of SpTraceVcdC.
 2010-01-24 18:37:01 -05:00