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 mips64
6
7import (
8	"cmd/compile/internal/ir"
9	"cmd/compile/internal/objw"
10	"cmd/compile/internal/types"
11	"cmd/internal/obj"
12	"cmd/internal/obj/mips"
13)
14
15func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
16	if cnt == 0 {
17		return p
18	}
19	if cnt < int64(4*types.PtrSize) {
20		for i := int64(0); i < cnt; i += int64(types.PtrSize) {
21			p = pp.Append(p, mips.AMOVV, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, 8+off+i)
22		}
23	} else if cnt <= int64(128*types.PtrSize) {
24		p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, 8+off-8, obj.TYPE_REG, mips.REGRT1, 0)
25		p.Reg = mips.REGSP
26		p = pp.Append(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
27		p.To.Name = obj.NAME_EXTERN
28		p.To.Sym = ir.Syms.Duffzero
29		p.To.Offset = 8 * (128 - cnt/int64(types.PtrSize))
30	} else {
31		//	ADDV	$(8+frame+lo-8), SP, r1
32		//	ADDV	$cnt, r1, r2
33		// loop:
34		//	MOVV	R0, (Widthptr)r1
35		//	ADDV	$Widthptr, r1
36		//	BNE		r1, r2, loop
37		p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, 8+off-8, obj.TYPE_REG, mips.REGRT1, 0)
38		p.Reg = mips.REGSP
39		p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, mips.REGRT2, 0)
40		p.Reg = mips.REGRT1
41		p = pp.Append(p, mips.AMOVV, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGRT1, int64(types.PtrSize))
42		p1 := p
43		p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, int64(types.PtrSize), obj.TYPE_REG, mips.REGRT1, 0)
44		p = pp.Append(p, mips.ABNE, obj.TYPE_REG, mips.REGRT1, 0, obj.TYPE_BRANCH, 0, 0)
45		p.Reg = mips.REGRT2
46		p.To.SetTarget(p1)
47	}
48
49	return p
50}
51
52func ginsnop(pp *objw.Progs) *obj.Prog {
53	p := pp.Prog(mips.ANOOP)
54	return p
55}
56