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cmd/internal/obj/riscv: use native rotation instructions for rva22u64
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>
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@ -2291,6 +2291,11 @@ func instructionsForMOV(p *obj.Prog) []*instruction {
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// instructionsForRotate returns the machine instructions for a bitwise rotation.
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func instructionsForRotate(p *obj.Prog, ins *instruction) []*instruction {
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if buildcfg.GORISCV64 >= 22 {
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// Rotation instructions are supported natively.
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return []*instruction{ins}
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}
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switch ins.as {
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case AROL, AROLW, AROR, ARORW:
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// ROL -> OR (SLL x y) (SRL x (NEG y))
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