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cmd/compile: simplify zerorange on mips

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Change-Id: I9feffa3906f1e1e9fd54f24113130322411cc9d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/701155
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
This commit is contained in:
Julian Zhu 2025-09-05 01:56:26 +08:00 • committed by Gopher Robot
parent cf42b785b7
commit 06e791c0cd
1 changed files with 7 additions and 27 deletions
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34
src/cmd/compile/internal/mips/ggen.go
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@ -5,41 +5,21 @@
package mips package mips
import ( import (
"cmd/compile/internal/base"
"cmd/compile/internal/objw" "cmd/compile/internal/objw"
"cmd/compile/internal/types" "cmd/compile/internal/types"
"cmd/internal/obj" "cmd/internal/obj"
"cmd/internal/obj/mips" "cmd/internal/obj/mips"
) )
// TODO(mips): implement DUFFZERO
func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog { func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
if cnt%int64(types.PtrSize) != 0 {
if cnt == 0 { panic("zeroed region not aligned")
return p
} }
if cnt < int64(4*types.PtrSize) {
for i := int64(0); i < cnt; i += int64(types.PtrSize) { for cnt != 0 {
p = pp.Append(p, mips.AMOVW, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, base.Ctxt.Arch.FixedFrameSize+off+i) p = pp.Append(p, mips.AMOVW, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, off)
} cnt -= int64(types.PtrSize)
} else { off += int64(types.PtrSize)
//fmt.Printf("zerorange frame:%v, lo: %v, hi:%v \n", frame ,lo, hi)
// ADD $(FIXED_FRAME+frame+lo-4), SP, r1
// ADD $cnt, r1, r2
// loop:
// MOVW R0, (Widthptr)r1
// ADD $Widthptr, r1
// BNE r1, r2, loop
p = pp.Append(p, mips.AADD, obj.TYPE_CONST, 0, base.Ctxt.Arch.FixedFrameSize+off-4, obj.TYPE_REG, mips.REGRT1, 0)
p.Reg = mips.REGSP
p = pp.Append(p, mips.AADD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, mips.REGRT2, 0)
p.Reg = mips.REGRT1
p = pp.Append(p, mips.AMOVW, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGRT1, int64(types.PtrSize))
p1 := p
p = pp.Append(p, mips.AADD, 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)
} }
return p return p