diff options
Diffstat (limited to 'src/cmd/compile/internal/arm/ggen.go')
-rw-r--r-- | src/cmd/compile/internal/arm/ggen.go | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/arm/ggen.go b/src/cmd/compile/internal/arm/ggen.go new file mode 100644 index 0000000..bd8d7ff --- /dev/null +++ b/src/cmd/compile/internal/arm/ggen.go @@ -0,0 +1,58 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package arm + +import ( + "cmd/compile/internal/gc" + "cmd/internal/obj" + "cmd/internal/obj/arm" +) + +func zerorange(pp *gc.Progs, p *obj.Prog, off, cnt int64, r0 *uint32) *obj.Prog { + if cnt == 0 { + return p + } + if *r0 == 0 { + p = pp.Appendpp(p, arm.AMOVW, obj.TYPE_CONST, 0, 0, obj.TYPE_REG, arm.REG_R0, 0) + *r0 = 1 + } + + if cnt < int64(4*gc.Widthptr) { + for i := int64(0); i < cnt; i += int64(gc.Widthptr) { + p = pp.Appendpp(p, arm.AMOVW, obj.TYPE_REG, arm.REG_R0, 0, obj.TYPE_MEM, arm.REGSP, 4+off+i) + } + } else if cnt <= int64(128*gc.Widthptr) { + p = pp.Appendpp(p, arm.AADD, obj.TYPE_CONST, 0, 4+off, obj.TYPE_REG, arm.REG_R1, 0) + p.Reg = arm.REGSP + p = pp.Appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0) + p.To.Name = obj.NAME_EXTERN + p.To.Sym = gc.Duffzero + p.To.Offset = 4 * (128 - cnt/int64(gc.Widthptr)) + } else { + p = pp.Appendpp(p, arm.AADD, obj.TYPE_CONST, 0, 4+off, obj.TYPE_REG, arm.REG_R1, 0) + p.Reg = arm.REGSP + p = pp.Appendpp(p, arm.AADD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, arm.REG_R2, 0) + p.Reg = arm.REG_R1 + p = pp.Appendpp(p, arm.AMOVW, obj.TYPE_REG, arm.REG_R0, 0, obj.TYPE_MEM, arm.REG_R1, 4) + p1 := p + p.Scond |= arm.C_PBIT + p = pp.Appendpp(p, arm.ACMP, obj.TYPE_REG, arm.REG_R1, 0, obj.TYPE_NONE, 0, 0) + p.Reg = arm.REG_R2 + p = pp.Appendpp(p, arm.ABNE, obj.TYPE_NONE, 0, 0, obj.TYPE_BRANCH, 0, 0) + gc.Patch(p, p1) + } + + return p +} + +func ginsnop(pp *gc.Progs) *obj.Prog { + p := pp.Prog(arm.AAND) + p.From.Type = obj.TYPE_REG + p.From.Reg = arm.REG_R0 + p.To.Type = obj.TYPE_REG + p.To.Reg = arm.REG_R0 + p.Scond = arm.C_SCOND_EQ + return p +} |