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) { 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 } 69
