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cmd/compile: simplify zerorange on mips64

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Change-Id: I488b55a21eaaf74373c2789a34bf9b3945ced072
Reviewed-on: https://go-review.googlesource.com/c/go/+/700936
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
This commit is contained in:
Julian Zhu 2025-09-04 21:38:47 +08:00 • committed by Gopher Robot
parent d52a56cce1
commit bb48272e24
1 changed files with 7 additions and 31 deletions
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38
src/cmd/compile/internal/mips64/ggen.go
View file

@ -5,7 +5,6 @@
package mips64
import (
"cmd/compile/internal/ir"
"cmd/compile/internal/objw"
"cmd/compile/internal/types"
"cmd/internal/obj"
@ -13,37 +12,14 @@ import (
)
func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
if cnt == 0 {
return p
if cnt%int64(types.PtrSize) != 0 {
panic("zeroed region not aligned")
}
if cnt < int64(4*types.PtrSize) {
for i := int64(0); i < cnt; i += int64(types.PtrSize) {
p = pp.Append(p, mips.AMOVV, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, 8+off+i)
}
} else if cnt <= int64(128*types.PtrSize) {
p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, 8+off-8, obj.TYPE_REG, mips.REGRT1, 0)
p.Reg = mips.REGSP
p = pp.Append(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
p.To.Name = obj.NAME_EXTERN
p.To.Sym = ir.Syms.Duffzero
p.To.Offset = 8 * (128 - cnt/int64(types.PtrSize))
} else {
// ADDV $(8+frame+lo-8), SP, r1
// ADDV $cnt, r1, r2
// loop:
// MOVV R0, (Widthptr)r1
// ADDV $Widthptr, r1
// BNE r1, r2, loop
p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, 8+off-8, obj.TYPE_REG, mips.REGRT1, 0)
p.Reg = mips.REGSP
p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, mips.REGRT2, 0)
p.Reg = mips.REGRT1
p = pp.Append(p, mips.AMOVV, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGRT1, int64(types.PtrSize))
p1 := p
p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, int64(types.PtrSize), obj.TYPE_REG, mips.REGRT1, 0)
p = pp.Append(p, mips.ABNE, obj.TYPE_REG, mips.REGRT1, 0, obj.TYPE_BRANCH, 0, 0)
p.Reg = mips.REGRT2
p.To.SetTarget(p1)
for cnt != 0 {
p = pp.Append(p, mips.AMOVV, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, off)
cnt -= int64(types.PtrSize)
off += int64(types.PtrSize)
}
return p