1// Copyright 2022 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 loong64
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/loong64"
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
21	// Adjust the frame to account for LR.
22	off += base.Ctxt.Arch.FixedFrameSize
23
24	if cnt < int64(4*types.PtrSize) {
25		for i := int64(0); i < cnt; i += int64(types.PtrSize) {
26			p = pp.Append(p, loong64.AMOVV, obj.TYPE_REG, loong64.REGZERO, 0, obj.TYPE_MEM, loong64.REGSP, off+i)
27		}
28	} else if cnt <= int64(128*types.PtrSize) {
29		p = pp.Append(p, loong64.AADDV, obj.TYPE_CONST, 0, off, obj.TYPE_REG, loong64.REGRT1, 0)
30		p.Reg = loong64.REGSP
31		p = pp.Append(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
32		p.To.Name = obj.NAME_EXTERN
33		p.To.Sym = ir.Syms.Duffzero
34		p.To.Offset = 8 * (128 - cnt/int64(types.PtrSize))
35	} else {
36		//	ADDV	$(off), SP, r1
37		//	ADDV	$cnt, r1, r2
38		// loop:
39		//	MOVV	R0, (r1)
40		//	ADDV	$Widthptr, r1
41		//	BNE	r1, r2, loop
42		p = pp.Append(p, loong64.AADDV, obj.TYPE_CONST, 0, off, obj.TYPE_REG, loong64.REGRT1, 0)
43		p.Reg = loong64.REGSP
44		p = pp.Append(p, loong64.AADDV, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, loong64.REGRT2, 0)
45		p.Reg = loong64.REGRT1
46		p = pp.Append(p, loong64.AMOVV, obj.TYPE_REG, loong64.REGZERO, 0, obj.TYPE_MEM, loong64.REGRT1, 0)
47		loop := p
48		p = pp.Append(p, loong64.AADDV, obj.TYPE_CONST, 0, int64(types.PtrSize), obj.TYPE_REG, loong64.REGRT1, 0)
49		p = pp.Append(p, loong64.ABNE, obj.TYPE_REG, loong64.REGRT1, 0, obj.TYPE_BRANCH, 0, 0)
50		p.Reg = loong64.REGRT2
51		p.To.SetTarget(loop)
52	}
53
54	return p
55}
56
57func ginsnop(pp *objw.Progs) *obj.Prog {
58	p := pp.Prog(loong64.ANOOP)
59	return p
60}
61