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[dev.simd] cmd/compile: glue codes for Shift and Rotate

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This CL adds two more intrinsic lowering functions. They can issue an
OpCopy to move a scalar value to vector value. This is needed by Shift
and Rotate APIs.

Change-Id: I8a83197d33207072c4a9221a931e67dddd5cd0bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/683476
Auto-Submit: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Junyang Shao 2025-06-24 03:59:30 +00:00 • committed by Gopher Robot
parent 61c1183342
commit 4fda27c0cc
1 changed files with 44 additions and 0 deletions
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44
src/cmd/compile/internal/amd64/ssa.go
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@ -1540,6 +1540,21 @@ func simdFp21(s *ssagen.State, v *ssa.Value) *obj.Prog {
return p
}
// This function is to accustomize the shifts.
// The 2nd arg is an XMM, and this function merely checks that.
// Example instruction: VPSLLQ Z1, X1, Z2
func simdFpXfp(s *ssagen.State, v *ssa.Value) *obj.Prog {
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
// Vector registers operands follows a right-to-left order.
// e.g. VPSUBD X1, X2, X3 means X3 = X2 - X1.
p.From.Reg = v.Args[1].Reg()
p.AddRestSourceReg(simdReg(v.Args[0]))
p.To.Type = obj.TYPE_REG
p.To.Reg = simdReg(v)
return p
}
// Example instruction: VPCMPEQW Z26, Z30, K4
func simdFp2k(s *ssagen.State, v *ssa.Value) *obj.Prog {
// simdReg handles mask and vector registers altogether
@ -1563,6 +1578,20 @@ func simdFp2kfp(s *ssagen.State, v *ssa.Value) *obj.Prog {
return p
}
// This function is to accustomize the shifts.
// The 2nd arg is an XMM, and this function merely checks that.
// Example instruction: VPSLLQ Z1, X1, K1, Z2
func simdFpXkfp(s *ssagen.State, v *ssa.Value) *obj.Prog {
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = v.Args[1].Reg()
p.AddRestSourceReg(simdReg(v.Args[0]))
p.AddRestSourceReg(simdReg(v.Args[2]))
p.To.Type = obj.TYPE_REG
p.To.Reg = simdReg(v)
return p
}
// Example instruction: VPCMPEQW Z26, Z30, K1, K4
func simdFp2kk(s *ssagen.State, v *ssa.Value) *obj.Prog {
return simdFp2kfp(s, v)
@ -1664,6 +1693,10 @@ func simdFp2kkImm8(s *ssagen.State, v *ssa.Value) *obj.Prog {
return p
}
func simdFp2kfpImm8(s *ssagen.State, v *ssa.Value) *obj.Prog {
return simdFp2kkImm8(s, v)
}
// Example instruction: VFMADD213PD Z2, Z1, Z0
func simdFp31ResultInArg0(s *ssagen.State, v *ssa.Value) *obj.Prog {
p := s.Prog(v.Op.Asm())
@ -1834,6 +1867,17 @@ func simdReg(v *ssa.Value) int16 {
panic("unreachable")
}
// XXX this is used for shift operations only.
// regalloc will issue OpCopy with incorrect type, but the assigned
// register should be correct, and this function is merely checking
// the sanity of this part.
func simdCheckRegOnly(v *ssa.Value, regStart, regEnd int16) int16 {
if v.Reg() > regEnd || v.Reg() < regStart {
panic("simdCheckRegOnly: not the desired register")
}
return v.Reg()
}
func simdMov(width int64) obj.As {
if width >= 64 {
return x86.AVMOVDQU64