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[dev.simd] simd, cmd/compile: add 128 bit select-from-pair

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Using this name until a better one appears:
   x.Select128FromPair(3, 2, y)

Includes test for constant and variable case.
Checks for unexpected immediates (using the zeroing flag,
which is not supported for this intrinsic) and panics.

Change-Id: I9249475d6572968c127b4ee9e00328d717c07578
Reviewed-on: https://go-review.googlesource.com/c/go/+/705496
Reviewed-by: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
David Chase 2025-09-19 13:07:59 -04:00
parent f0e281e693
commit 25c36b95d1
18 changed files with 369 additions and 5 deletions
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2
src/cmd/compile/internal/amd64/simdssa.go
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@ -1053,6 +1053,8 @@ func ssaGenSIMDValue(s *ssagen.State, v *ssa.Value) bool {
ssa.OpAMD64VGF2P8AFFINEINVQB128,
ssa.OpAMD64VGF2P8AFFINEINVQB256,
ssa.OpAMD64VGF2P8AFFINEINVQB512,
ssa.OpAMD64VPERM2F128256,
ssa.OpAMD64VPERM2I128256,
ssa.OpAMD64VINSERTF128256,
ssa.OpAMD64VINSERTF64X4512,
ssa.OpAMD64VINSERTI128256,