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cmd/compile: fix the implementation of NORconst on loong64

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In the loong64 instruction set, there is no NORI instruction,
so the immediate value in NORconst need to be stored in register
and then use the three-register NOR instruction.

Change-Id: I5ef697450619317218cb3ef47fc07e238bdc2139
Reviewed-on: https://go-review.googlesource.com/c/go/+/673836
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Xiaolin Zhao 2025-05-19 17:02:48 +08:00 committed by abner chenc
parent 74304cda29
commit d37a1bdd48
2 changed files with 26 additions and 1 deletions
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18
src/cmd/compile/internal/loong64/ssa.go
View File

@ -276,7 +276,6 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
ssa.OpLOONG64ANDconst,
ssa.OpLOONG64ORconst,
ssa.OpLOONG64XORconst,
ssa.OpLOONG64NORconst,
ssa.OpLOONG64SLLconst,
ssa.OpLOONG64SLLVconst,
ssa.OpLOONG64SRLconst,
@ -293,6 +292,23 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
p.Reg = v.Args[0].Reg()
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpLOONG64NORconst:
// MOVV $const, Rtmp
// NOR Rtmp, Rarg0, Rout
p := s.Prog(loong64.AMOVV)
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt
p.To.Type = obj.TYPE_REG
p.To.Reg = loong64.REGTMP
p2 := s.Prog(v.Op.Asm())
p2.From.Type = obj.TYPE_REG
p2.From.Reg = loong64.REGTMP
p2.Reg = v.Args[0].Reg()
p2.To.Type = obj.TYPE_REG
p2.To.Reg = v.Reg()
case ssa.OpLOONG64MOVVconst:
r := v.Reg()
p := s.Prog(v.Op.Asm())

9
test/codegen/bits.go
View File

@ -335,6 +335,15 @@ func op_orn(x, y uint32) uint32 {
return x | ^y
}
func op_nor(x int64, a []int64) {
// loong64: "MOVV\t[$]0","NOR\tR"
a[0] = ^(0x1234 | x)
// loong64:"NOR",-"XOR"
a[1] = (-1) ^ x
// loong64: "MOVV\t[$]-55",-"OR",-"NOR"
a[2] = ^(0x12 | 0x34)
}
// check bitsets
func bitSetPowerOf2Test(x int) bool {
// amd64:"BTL\t[$]3"