1// Copyright 2016 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 mips
6
7import (
8	"cmd/compile/internal/base"
9	"cmd/compile/internal/objw"
10	"cmd/compile/internal/types"
11	"cmd/internal/obj"
12	"cmd/internal/obj/mips"
13)
14
15// TODO(mips): implement DUFFZERO
16func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
17
18	if cnt == 0 {
19		return p
20	}
21	if cnt < int64(4*types.PtrSize) {
22		for i := int64(0); i < cnt; i += int64(types.PtrSize) {
23			p = pp.Append(p, mips.AMOVW, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, base.Ctxt.FixedFrameSize()+off+i)
24		}
25	} else {
26		//fmt.Printf("zerorange frame:%v, lo: %v, hi:%v \n", frame ,lo, hi)
27		//	ADD 	$(FIXED_FRAME+frame+lo-4), SP, r1
28		//	ADD 	$cnt, r1, r2
29		// loop:
30		//	MOVW	R0, (Widthptr)r1
31		//	ADD 	$Widthptr, r1
32		//	BNE		r1, r2, loop
33		p = pp.Append(p, mips.AADD, obj.TYPE_CONST, 0, base.Ctxt.FixedFrameSize()+off-4, obj.TYPE_REG, mips.REGRT1, 0)
34		p.Reg = mips.REGSP
35		p = pp.Append(p, mips.AADD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, mips.REGRT2, 0)
36		p.Reg = mips.REGRT1
37		p = pp.Append(p, mips.AMOVW, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGRT1, int64(types.PtrSize))
38		p1 := p
39		p = pp.Append(p, mips.AADD, obj.TYPE_CONST, 0, int64(types.PtrSize), obj.TYPE_REG, mips.REGRT1, 0)
40		p = pp.Append(p, mips.ABNE, obj.TYPE_REG, mips.REGRT1, 0, obj.TYPE_BRANCH, 0, 0)
41		p.Reg = mips.REGRT2
42		p.To.SetTarget(p1)
43	}
44
45	return p
46}
47
48func ginsnop(pp *objw.Progs) *obj.Prog {
49	p := pp.Prog(mips.ANOR)
50	p.From.Type = obj.TYPE_REG
51	p.From.Reg = mips.REG_R0
52	p.To.Type = obj.TYPE_REG
53	p.To.Reg = mips.REG_R0
54	return p
55}
56