[go] cmd/compile: allow equal functions to perform unaligned load on loong64

[Gopher Robot (Gerrit)]

Gopher Robot submitted the change

Change information

Commit message:

cmd/compile: allow equal functions to perform unaligned load on loong64

The Go compiler always generates Loong64 binaries, which can execute any
processor of LA364, LA464, LA664 or higher core. And these processors
support unaligned memory access [1].

goos: linux
goarch: loong64
pkg: strings
cpu: Loongson-3A6000 @ 2500.00MHz
              |   old.txt    |               new.txt                |
              |    sec/op    |    sec/op     vs base                |
StringPrefix3   4.0040n ± 0%   0.4003n ± 0%  -90.00% (p=0.000 n=10)
StringPrefix5   4.0040n ± 0%   0.4003n ± 0%  -90.00% (p=0.000 n=10)
StringPrefix6   3.6030n ± 0%   0.4002n ± 0%  -88.89% (p=0.000 n=10)
StringPrefix7   4.0040n ± 0%   0.4002n ± 0%  -90.00% (p=0.000 n=10)
geomean          3.900n        0.4003n       -89.74%

goos: linux
goarch: loong64
pkg: strings
cpu: Loongson-3A5000-HV @ 2500.00MHz
              |   old.txt    │               new.txt                |
              |    sec/op    │    sec/op     vs base                |
StringPrefix3   5.6160n ± 0%   0.4011n ± 0%  -92.86% (p=0.000 n=10)
StringPrefix5   5.6180n ± 0%   0.4011n ± 0%  -92.86% (p=0.000 n=10)
StringPrefix6   5.2170n ± 0%   0.4011n ± 0%  -92.31% (p=0.000 n=10)
StringPrefix7   5.6170n ± 0%   0.4009n ± 0%  -92.86% (p=0.000 n=10)
geomean          5.514n        0.4010n       -92.73%

goos: linux
goarch: loong64
pkg: strings
cpu: Loongson-3B6000M @ 2400.00MHz
              |   old.txt    │               new.txt                |
              |    sec/op    │    sec/op     vs base                |
StringPrefix3   5.0060n ± 0%   0.4223n ± 1%  -91.56% (p=0.000 n=10)
StringPrefix5   4.5890n ± 0%   0.4214n ± 0%  -90.82% (p=0.000 n=10)
StringPrefix6   4.5890n ± 0%   0.4190n ± 1%  -90.87% (p=0.000 n=10)
StringPrefix7   4.5890n ± 0%   0.4226n ± 1%  -90.79% (p=0.000 n=10)
geomean          4.690n        0.4213n       -91.02%

[1]: https://go.dev/wiki/MinimumRequirements#loong64

Change-Id: I1870080e0122a7d136685e3045699d0cf1e4194d

Reviewed-on: https://go-review.googlesource.com/c/go/+/742260

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Reviewed-by: Meidan Li <lime...@loongson.cn>

Reviewed-by: Michael Pratt <mpr...@google.com>

Reviewed-by: Michael Knyszek <mkny...@google.com>

Auto-Submit: Michael Pratt <mpr...@google.com>

Files:

• M src/cmd/internal/sys/arch.go
• M test/codegen/comparisons.go

Change size: S

Delta: 2 files changed, 9 insertions(+), 1 deletion(-)

Branch: refs/heads/master

Submit Requirements:

• Code-Review: +2 by Meidan Li, +1 by Michael Pratt, +1 by Michael Knyszek
• TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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Gerrit

Gerrit-MessageType: merged

Gerrit-Project: go

Gerrit-Branch: master

Gerrit-Change-Id: I1870080e0122a7d136685e3045699d0cf1e4194d

Gerrit-Change-Number: 742260

Gerrit-PatchSet: 2

Gerrit-Owner: abner chenc <chen...@loongson.cn>

Gerrit-Reviewer: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Gerrit-Reviewer: Gopher Robot <go...@golang.org>

Gerrit-Reviewer: Meidan Li <lime...@loongson.cn>

Gerrit-Reviewer: Michael Knyszek <mkny...@google.com>

Gerrit-Reviewer: Michael Pratt <mpr...@google.com>

Gerrit-Reviewer: abner chenc <chen...@loongson.cn>

Gerrit-Reviewer: sophie zhao <zhaox...@loongson.cn>