1// Copyright 2009 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package ppc64
6
7import (
8	"cmd/compile/internal/base"
9	"cmd/compile/internal/ir"
10	"cmd/compile/internal/objw"
11	"cmd/compile/internal/types"
12	"cmd/internal/obj"
13	"cmd/internal/obj/ppc64"
14)
15
16func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
17	if cnt == 0 {
18		return p
19	}
20	if cnt < int64(4*types.PtrSize) {
21		for i := int64(0); i < cnt; i += int64(types.PtrSize) {
22			p = pp.Append(p, ppc64.AMOVD, obj.TYPE_REG, ppc64.REGZERO, 0, obj.TYPE_MEM, ppc64.REGSP, base.Ctxt.Arch.FixedFrameSize+off+i)
23		}
24	} else if cnt <= int64(128*types.PtrSize) {
25		p = pp.Append(p, ppc64.AADD, obj.TYPE_CONST, 0, base.Ctxt.Arch.FixedFrameSize+off-8, obj.TYPE_REG, ppc64.REGRT1, 0)
26		p.Reg = ppc64.REGSP
27		p = pp.Append(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
28		p.To.Name = obj.NAME_EXTERN
29		p.To.Sym = ir.Syms.Duffzero
30		p.To.Offset = 4 * (128 - cnt/int64(types.PtrSize))
31	} else {
32		p = pp.Append(p, ppc64.AMOVD, obj.TYPE_CONST, 0, base.Ctxt.Arch.FixedFrameSize+off-8, obj.TYPE_REG, ppc64.REGTMP, 0)
33		p = pp.Append(p, ppc64.AADD, obj.TYPE_REG, ppc64.REGTMP, 0, obj.TYPE_REG, ppc64.REGRT1, 0)
34		p.Reg = ppc64.REGSP
35		p = pp.Append(p, ppc64.AMOVD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, ppc64.REGTMP, 0)
36		p = pp.Append(p, ppc64.AADD, obj.TYPE_REG, ppc64.REGTMP, 0, obj.TYPE_REG, ppc64.REGRT2, 0)
37		p.Reg = ppc64.REGRT1
38		p = pp.Append(p, ppc64.AMOVDU, obj.TYPE_REG, ppc64.REGZERO, 0, obj.TYPE_MEM, ppc64.REGRT1, int64(types.PtrSize))
39		p1 := p
40		p = pp.Append(p, ppc64.ACMP, obj.TYPE_REG, ppc64.REGRT1, 0, obj.TYPE_REG, ppc64.REGRT2, 0)
41		p = pp.Append(p, ppc64.ABNE, obj.TYPE_NONE, 0, 0, obj.TYPE_BRANCH, 0, 0)
42		p.To.SetTarget(p1)
43	}
44
45	return p
46}
47
48func ginsnop(pp *objw.Progs) *obj.Prog {
49	// Generate the preferred hardware nop: ori 0,0,0
50	p := pp.Prog(ppc64.AOR)
51	p.From = obj.Addr{Type: obj.TYPE_CONST, Offset: 0}
52	p.To = obj.Addr{Type: obj.TYPE_REG, Reg: ppc64.REG_R0}
53	return p
54}
55