go ggen 源码
golang ggen 代码
文件路径：/src/cmd/compile/internal/arm/ggen.go
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package arm
import (
"cmd/compile/internal/ir"
"cmd/compile/internal/objw"
"cmd/compile/internal/types"
"cmd/internal/obj"
"cmd/internal/obj/arm"
)
func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, r0 *uint32) *obj.Prog {
if cnt == 0 {
return p
}
if *r0 == 0 {
p = pp.Append(p, arm.AMOVW, obj.TYPE_CONST, 0, 0, obj.TYPE_REG, arm.REG_R0, 0)
*r0 = 1
}
if cnt < int64(4*types.PtrSize) {
for i := int64(0); i < cnt; i += int64(types.PtrSize) {
p = pp.Append(p, arm.AMOVW, obj.TYPE_REG, arm.REG_R0, 0, obj.TYPE_MEM, arm.REGSP, 4+off+i)
}
} else if cnt <= int64(128*types.PtrSize) {
p = pp.Append(p, arm.AADD, obj.TYPE_CONST, 0, 4+off, obj.TYPE_REG, arm.REG_R1, 0)
p.Reg = arm.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 = 4 * (128 - cnt/int64(types.PtrSize))
} else {
p = pp.Append(p, arm.AADD, obj.TYPE_CONST, 0, 4+off, obj.TYPE_REG, arm.REG_R1, 0)
p.Reg = arm.REGSP
p = pp.Append(p, arm.AADD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, arm.REG_R2, 0)
p.Reg = arm.REG_R1
p = pp.Append(p, arm.AMOVW, obj.TYPE_REG, arm.REG_R0, 0, obj.TYPE_MEM, arm.REG_R1, 4)
p1 := p
p.Scond |= arm.C_PBIT
p = pp.Append(p, arm.ACMP, obj.TYPE_REG, arm.REG_R1, 0, obj.TYPE_NONE, 0, 0)
p.Reg = arm.REG_R2
p = pp.Append(p, arm.ABNE, obj.TYPE_NONE, 0, 0, obj.TYPE_BRANCH, 0, 0)
p.To.SetTarget(p1)
}
return p
}
func ginsnop(pp *objw.Progs) *obj.Prog {
p := pp.Prog(arm.AAND)
p.From.Type = obj.TYPE_REG
p.From.Reg = arm.REG_R0
p.To.Type = obj.TYPE_REG
p.To.Reg = arm.REG_R0
p.Scond = arm.C_SCOND_EQ
return p
}
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