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e31c9ab557
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Josh Bleecher Snyder e31c9ab557 cmd/link,runtime: remove functab relocations 
Use an offset from runtime.text instead.
This removes the last relocation from functab generation,
which lets us simplify that code.

size      before    after     Δ        %
addr2line 3680818   3652498   -28320   -0.769%
api       4944850   4892418   -52432   -1.060%
asm       4757586   4711266   -46320   -0.974%
buildid   2418546   2392578   -25968   -1.074%
cgo       4197346   4164818   -32528   -0.775%
compile   22076882  21875890  -200992  -0.910%
cover     4411362   4358418   -52944   -1.200%
dist      3091346   3062738   -28608   -0.925%
doc       3563234   3532610   -30624   -0.859%
fix       3020658   2991666   -28992   -0.960%
link      6164642   6110834   -53808   -0.873%
nm        3646818   3618482   -28336   -0.777%
objdump   4012594   3983042   -29552   -0.736%
pack      2153554   2128338   -25216   -1.171%
pprof     13011666  12870114  -141552  -1.088%
test2json 2383906   2357554   -26352   -1.105%
trace     9736514   9631186   -105328  -1.082%
vet       6655058   6580370   -74688   -1.122%
total     103927380 102914820 -1012560 -0.974%

relocs    before  after   Δ       %
addr2line 25069   22709   -2360   -9.414%
api       17176   13321   -3855   -22.444%
asm       18271   15630   -2641   -14.455%
buildid   9233    7352    -1881   -20.373%
cgo       16222   13044   -3178   -19.591%
compile   60421   46299   -14122  -23.373%
cover     18479   14526   -3953   -21.392%
dist      10135   7733    -2402   -23.700%
doc       12735   9940    -2795   -21.947%
fix       10820   8341    -2479   -22.911%
link      21849   17785   -4064   -18.600%
nm        24988   22642   -2346   -9.389%
objdump   26060   23462   -2598   -9.969%
pack      7665    5936    -1729   -22.557%
pprof     60764   50998   -9766   -16.072%
test2json 8389    6431    -1958   -23.340%
trace     37180   29382   -7798   -20.974%
vet       24044   19055   -4989   -20.749%
total     409499  334585  -74914  -18.294%


Caching the field size in debug/gosym.funcTab
avoids a 20% PCToLine performance regression.

name            old time/op    new time/op    delta
115/LineToPC-8    56.4µs ± 3%    57.3µs ± 2%  +1.66%  (p=0.006 n=15+13)
115/PCToLine-8     188ns ± 2%     190ns ± 3%  +1.46%  (p=0.030 n=15+15)


Change-Id: I2816a1b28e62b01852e3b306f08546f1e56cd5ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/352191
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-10-05 23:25:06 +00:00
.github .github: update IRC server 2021-09-30 19:56:27 +00:00
api cmd/api: set architecture sizes when type checking 2021-10-04 20:20:20 +00:00
doc cmd/go: add release note for 'go get' changes 2021-09-28 17:19:19 +00:00
lib/time lib/time: fix RFC 6557 url 2021-08-15 02:18:46 +00:00
misc cmd/cgo: add go:notinheap annotation to Windows handle types 2021-09-22 18:10:24 +00:00
src cmd/link,runtime: remove functab relocations 2021-10-05 23:25:06 +00:00
test test: add test for export/import of recover & defer 2021-10-05 20:53:02 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
LICENSE
PATENTS
README.md README.md: update contribute URL 2021-09-30 13:33:21 +00:00
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

README.md

The Go Programming Language

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