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3659b8756a
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Joel Sing 3659b8756a 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>
2024-03-26 02:22:30 +00:00
.github github: switch seen/expected order in issue forms 2024-01-04 23:31:17 +00:00
api Revert "testing: add TB.SetGOMAXPROCS function" 2024-03-22 13:07:36 +00:00
doc Revert "testing: add TB.SetGOMAXPROCS function" 2024-03-22 13:07:36 +00:00
lib/time lib/time: use consistent directory in mkzip usage message 2024-03-04 17:32:07 +00:00
misc misc/wasm: support new wasmtime CLI 2023-11-19 21:11:54 +00:00
src cmd/internal/obj/riscv: use native rotation instructions for rva22u64 2024-03-26 02:22:30 +00:00
test runtime: migrate internal/atomic to internal/runtime 2024-03-25 19:53:03 +00:00
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README.md

The Go Programming Language

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