| commit | 4aeac68c92c5b79d098aaa7fba168d4c943541ba | [log] [tgz] |
|---|---|---|
| author | Josh Bleecher Snyder <josharian@gmail.com> | Thu Apr 11 12:18:10 2019 -0700 |
| committer | Josh Bleecher Snyder <josharian@gmail.com> | Fri Apr 19 15:40:42 2019 +0000 |
| tree | 4583eb98e3b70309bbc8f5129c859114f5c8f066 | |
| parent | c1544ff906c3696774152aaa6594d6cefce15552 [diff] |
runtime, cmd/compile: re-order PCDATA and FUNCDATA indices The pclntab encoding supports writing only some PCDATA and FUNCDATA values. However, the encoding is dense: The max index in use determines the space used. We should thus choose a numbering in which frequently used indices are smaller. This change re-orders the PCDATA and FUNCDATA indices using that principle, using a quick and dirty instrumentation to measure index frequency. It shrinks binaries by about 0.5%. Updates #6853 file before after Δ % go 14745044 14671316 -73728 -0.500% addr2line 4305128 4280552 -24576 -0.571% api 6095800 6058936 -36864 -0.605% asm 4930928 4906352 -24576 -0.498% buildid 2881520 2861040 -20480 -0.711% cgo 4896584 4867912 -28672 -0.586% compile 25868408 25770104 -98304 -0.380% cover 5319656 5286888 -32768 -0.616% dist 3654528 3634048 -20480 -0.560% doc 4719672 4691000 -28672 -0.607% fix 3418312 3393736 -24576 -0.719% link 6137952 6109280 -28672 -0.467% nm 4250536 4225960 -24576 -0.578% objdump 4665192 4636520 -28672 -0.615% pack 2297488 2285200 -12288 -0.535% pprof 14735332 14657508 -77824 -0.528% test2json 2834952 2818568 -16384 -0.578% trace 11679964 11618524 -61440 -0.526% vet 8452696 8403544 -49152 -0.581% Change-Id: I30665dce57ec7a52e7d3c6718560b3aa5b83dd0b Reviewed-on: https://go-review.googlesource.com/c/go/+/171760 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
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