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cmd/internal/obj/riscv: use native rotation instructions for rva22u64

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When rva22u64 is available, we can now use the native rotation instructions
from the Zbb extension. Use these instead of synthesising rotation
instructions.

This provides a significant performance gain for SHA-512, the following
benchmarked on a StarFive VisionFive 2:

                    │ sha512.rva20u64 │            sha512.rva22u64            │
                    │       B/s       │      B/s       vs base                │
Hash8Bytes/New-4         859.4Ki ± 0%   1337.9Ki ± 0%  +55.68% (p=0.000 n=10)
Hash8Bytes/Sum384-4      888.7Ki ± 1%   1308.6Ki ± 1%  +47.25% (p=0.000 n=10)
Hash8Bytes/Sum512-4      869.1Ki ± 0%   1269.5Ki ± 1%  +46.07% (p=0.000 n=10)
Hash1K/New-4             19.83Mi ± 0%    29.03Mi ± 0%  +46.38% (p=0.000 n=10)
Hash1K/Sum384-4          20.00Mi ± 0%    28.86Mi ± 0%  +44.30% (p=0.000 n=10)
Hash1K/Sum512-4          19.93Mi ± 0%    28.72Mi ± 0%  +44.11% (p=0.000 n=10)
Hash8K/New-4             23.85Mi ± 0%    34.12Mi ± 0%  +43.09% (p=0.000 n=10)
Hash8K/Sum384-4          23.88Mi ± 0%    34.09Mi ± 0%  +42.77% (p=0.000 n=10)
Hash8K/Sum512-4          23.87Mi ± 0%    34.07Mi ± 0%  +42.71% (p=0.000 n=10)
geomean                  7.399Mi         10.78Mi       +45.77%

Change-Id: I9dca8e3f311eea101684c806cb998872dc697288
Reviewed-on: https://go-review.googlesource.com/c/go/+/572716
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: M Zhuo <mengzhuo1203@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
Auto-Submit: Emmanuel Odeke <emmanuel@orijtech.com>
This commit is contained in:
Joel Sing 2024-03-19 22:36:42 +11:00 committed by Gopher Robot
parent 3fefec96ad
commit 3659b8756a
1 changed files with 5 additions and 0 deletions
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5
src/cmd/internal/obj/riscv/obj.go
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@ -2291,6 +2291,11 @@ func instructionsForMOV(p *obj.Prog) []*instruction {
// instructionsForRotate returns the machine instructions for a bitwise rotation.
func instructionsForRotate(p *obj.Prog, ins *instruction) []*instruction {
if buildcfg.GORISCV64 >= 22 {
// Rotation instructions are supported natively.
return []*instruction{ins}
}
switch ins.as {
case AROL, AROLW, AROR, ARORW:
// ROL -> OR (SLL x y) (SRL x (NEG y))