Source file src/pkg/cmd/compile/internal/mips/ggen.go

     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	
     5	package mips
     6	
     7	import (
     8		"cmd/compile/internal/gc"
     9		"cmd/internal/obj"
    10		"cmd/internal/obj/mips"
    11	)
    12	
    13	// TODO(mips): implement DUFFZERO
    14	func zerorange(pp *gc.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
    15	
    16		if cnt == 0 {
    17			return p
    18		}
    19		if cnt < int64(4*gc.Widthptr) {
    20			for i := int64(0); i < cnt; i += int64(gc.Widthptr) {
    21				p = pp.Appendpp(p, mips.AMOVW, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, gc.Ctxt.FixedFrameSize()+off+i)
    22			}
    23		} else {
    24			//fmt.Printf("zerorange frame:%v, lo: %v, hi:%v \n", frame ,lo, hi)
    25			//	ADD 	$(FIXED_FRAME+frame+lo-4), SP, r1
    26			//	ADD 	$cnt, r1, r2
    27			// loop:
    28			//	MOVW	R0, (Widthptr)r1
    29			//	ADD 	$Widthptr, r1
    30			//	BNE		r1, r2, loop
    31			p = pp.Appendpp(p, mips.AADD, obj.TYPE_CONST, 0, gc.Ctxt.FixedFrameSize()+off-4, obj.TYPE_REG, mips.REGRT1, 0)
    32			p.Reg = mips.REGSP
    33			p = pp.Appendpp(p, mips.AADD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, mips.REGRT2, 0)
    34			p.Reg = mips.REGRT1
    35			p = pp.Appendpp(p, mips.AMOVW, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGRT1, int64(gc.Widthptr))
    36			p1 := p
    37			p = pp.Appendpp(p, mips.AADD, obj.TYPE_CONST, 0, int64(gc.Widthptr), obj.TYPE_REG, mips.REGRT1, 0)
    38			p = pp.Appendpp(p, mips.ABNE, obj.TYPE_REG, mips.REGRT1, 0, obj.TYPE_BRANCH, 0, 0)
    39			p.Reg = mips.REGRT2
    40			gc.Patch(p, p1)
    41		}
    42	
    43		return p
    44	}
    45	
    46	func zeroAuto(pp *gc.Progs, n *gc.Node) {
    47		// Note: this code must not clobber any registers.
    48		sym := n.Sym.Linksym()
    49		size := n.Type.Size()
    50		for i := int64(0); i < size; i += 4 {
    51			p := pp.Prog(mips.AMOVW)
    52			p.From.Type = obj.TYPE_REG
    53			p.From.Reg = mips.REGZERO
    54			p.To.Type = obj.TYPE_MEM
    55			p.To.Name = obj.NAME_AUTO
    56			p.To.Reg = mips.REGSP
    57			p.To.Offset = n.Xoffset + i
    58			p.To.Sym = sym
    59		}
    60	}
    61	
    62	func ginsnop(pp *gc.Progs) *obj.Prog {
    63		p := pp.Prog(mips.ANOR)
    64		p.From.Type = obj.TYPE_REG
    65		p.From.Reg = mips.REG_R0
    66		p.To.Type = obj.TYPE_REG
    67		p.To.Reg = mips.REG_R0
    68		return p
    69	}
    70	

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