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Wayne Zuo 14015be5bb cmd/compile: optimize multiplication on loong64
Previously, multiplication on loong64 architecture was performed using
MULV and MULHVU instructions to calculate the low 64-bit and high
64-bit of a multiplication respectively. However, in most cases, only
the low 64-bits are needed. This commit enalbes only computating the low
64-bit result with the MULV instruction.

Reduce the binary size slightly.

file      before    after     Δ       %
addr2line 2833777   2833849   +72     +0.003%
asm       5267499   5266963   -536    -0.010%
buildid   2579706   2579402   -304    -0.012%
cgo       4798260   4797444   -816    -0.017%
compile   25247419  25175030  -72389  -0.287%
cover     4973091   4972027   -1064   -0.021%
dist      3631013   3565653   -65360  -1.800%
doc       4076036   4074004   -2032   -0.050%
fix       3496378   3496066   -312    -0.009%
link      6984102   6983214   -888    -0.013%
nm        2743820   2743516   -304    -0.011%
objdump   4277171   4277035   -136    -0.003%
pack      2379248   2378872   -376    -0.016%
pprof     14419090  14419874  +784    +0.005%
test2json 2684386   2684018   -368    -0.014%
trace     13640018  13631034  -8984   -0.066%
vet       7748918   7752630   +3712   +0.048%
go        15643850  15638098  -5752   -0.037%
total     127423782 127268729 -155053 -0.122%

Change-Id: Ifce4a9a3ed1d03c170681e39cb6f3541db9882dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/472775
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: David Chase <drchase@google.com>
2023-03-03 01:33:00 +00:00
.github .github: suggest using private browsing in pkgsite template 2023-01-03 18:52:47 +00:00
api cmd/go, go/build: parse directives in file headers 2023-02-23 10:10:21 +00:00
doc doc: start draft Go 1.21 release notes 2023-02-22 18:53:00 +00:00
lib/time time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
misc all: implement wasmimport directive 2023-03-02 05:28:55 +00:00
src cmd/compile: optimize multiplication on loong64 2023-03-03 01:33:00 +00:00
test cmd/compile: relax overly strict assertion 2023-03-01 20:26:10 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
go.env cmd/go: introduce GOROOT/go.env and move proxy/sumdb config there 2023-01-17 23:10:39 +00:00
LICENSE
PATENTS
README.md README: update from CC-BY-3.0 to CC-BY-4.0 2022-11-02 20:14:56 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

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