[go] cmd/compile: shuffle bits.Sub intrinsic generation on amd64

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Gopher Robot (Gerrit)

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May 15, 2026, 11:26:29 AM (18 hours ago) May 15

to Jorropo, goph...@pubsubhelper.golang.org, golang-...@googlegroups.com, Dmitri Shuralyov, Dmitri Shuralyov, Keith Randall, Keith Randall, golang...@luci-project-accounts.iam.gserviceaccount.com, Martin Möhrmann, golang-co...@googlegroups.com

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Change information

Commit message:

cmd/compile: shuffle bits.Sub intrinsic generation on amd64

Assuming the CPU recognize SBB RX, RX as a dependency break,
this is a no-op however SET is much more canonical and easier
to match for.

Updates #76056

Change-Id: Icc590dbcc76a8ed2fca7b167cfb66a2d33d4d2d5

Reviewed-on: https://go-review.googlesource.com/c/go/+/778140

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

Reviewed-by: Keith Randall <k...@google.com>

Reviewed-by: Dmitri Shuralyov <dmit...@google.com>

Reviewed-by: Keith Randall <k...@golang.org>

Auto-Submit: Jorropo <jorro...@gmail.com>

Files:

M src/cmd/compile/internal/ssa/_gen/AMD64.rules
M src/cmd/compile/internal/ssa/rewriteAMD64.go
M test/codegen/mathbits.go

Change size: M

Delta: 3 files changed, 36 insertions(+), 45 deletions(-)

Branch: refs/heads/master

Submit Requirements:

Code-Review: +2 by Keith Randall, +1 by Keith Randall, +1 by Dmitri Shuralyov
TryBots-Pass: LUCI-TryBot-Result+1 by golang...@luci-project-accounts.iam.gserviceaccount.com

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