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[dev.simd] cmd/compile: make condtion of CanSSA smarter for SIMD fields

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This CL tires to improve a situation pointed out by
https://github.com/golang/go/issues/73787#issuecomment-3305494947.

Change-Id: Ic23c80fe71344fc25383ab238ad6631e0f0cd22e
Reviewed-on: https://go-review.googlesource.com/c/go/+/705416
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Junyang Shao 2025-09-19 04:38:19 +00:00
parent c28b2a0ca1
commit 578777bf7c
3 changed files with 88 additions and 3 deletions
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30
test/codegen/simd.go
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@ -27,3 +27,33 @@ func vptest2() bool {
// amd64:`SETEQ\s(.*)$`
return v1.And(v2).IsZero()
}
type Args2 struct {
V0 simd.Uint8x32
V1 simd.Uint8x32
x string
}
//go:noinline
func simdStructNoSpill(a Args2) simd.Uint8x32 {
// amd64:-`VMOVDQU\s.*$`
return a.V0.Xor(a.V1)
}
func simdStructWrapperNoSpill(a Args2) simd.Uint8x32 {
// amd64:-`VMOVDQU\s.*$`
a.x = "test"
return simdStructNoSpill(a)
}
//go:noinline
func simdArrayNoSpill(a [1]Args2) simd.Uint8x32 {
// amd64:-`VMOVDQU\s.*$`
return a[0].V0.Xor(a[0].V1)
}
func simdArrayWrapperNoSpill(a [1]Args2) simd.Uint8x32 {
// amd64:-`VMOVDQU\s.*$`
a[0].x = "test"
return simdArrayNoSpill(a)
}