ggen.go

Documentation: cmd/compile/internal/mips

     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/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
    16  func 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.Arch.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.Arch.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  
    48  func ginsnop(pp *objw.Progs) *obj.Prog {
    49  	p := pp.Prog(mips.ANOOP)
    50  	return p
    51  }
    52
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