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