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ssa.go
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ssa.go
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// Copyright 2016 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/compile/internal/ssa"
"cmd/internal/obj"
"cmd/internal/obj/arm"
)
var ssaRegToReg = []int16{
arm.REG_R0,
arm.REG_R1,
arm.REG_R2,
arm.REG_R3,
arm.REGSP, // aka R13
}
func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
s.SetLineno(v.Line)
switch v.Op {
case ssa.OpInitMem:
// memory arg needs no code
case ssa.OpArg:
// input args need no code
case ssa.OpSP, ssa.OpSB:
// nothing to do
case ssa.OpCopy:
case ssa.OpLoadReg:
// TODO: by type
p := gc.Prog(arm.AMOVW)
n, off := gc.AutoVar(v.Args[0])
p.From.Type = obj.TYPE_MEM
p.From.Node = n
p.From.Sym = gc.Linksym(n.Sym)
p.From.Offset = off
if n.Class == gc.PPARAM || n.Class == gc.PPARAMOUT {
p.From.Name = obj.NAME_PARAM
p.From.Offset += n.Xoffset
} else {
p.From.Name = obj.NAME_AUTO
}
p.To.Type = obj.TYPE_REG
p.To.Reg = gc.SSARegNum(v)
case ssa.OpStoreReg:
// TODO: by type
p := gc.Prog(arm.AMOVW)
p.From.Type = obj.TYPE_REG
p.From.Reg = gc.SSARegNum(v.Args[0])
n, off := gc.AutoVar(v)
p.To.Type = obj.TYPE_MEM
p.To.Node = n
p.To.Sym = gc.Linksym(n.Sym)
p.To.Offset = off
if n.Class == gc.PPARAM || n.Class == gc.PPARAMOUT {
p.To.Name = obj.NAME_PARAM
p.To.Offset += n.Xoffset
} else {
p.To.Name = obj.NAME_AUTO
}
case ssa.OpARMADD:
r := gc.SSARegNum(v)
r1 := gc.SSARegNum(v.Args[0])
r2 := gc.SSARegNum(v.Args[1])
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = r1
p.Reg = r2
p.To.Type = obj.TYPE_REG
p.To.Reg = r
case ssa.OpARMADDconst:
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt
if v.Aux != nil {
panic("can't handle symbolic constant yet")
}
p.Reg = gc.SSARegNum(v.Args[0])
p.To.Type = obj.TYPE_REG
p.To.Reg = gc.SSARegNum(v)
case ssa.OpARMMOVWconst:
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt
p.To.Type = obj.TYPE_REG
p.To.Reg = gc.SSARegNum(v)
case ssa.OpARMCMP:
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
// Special layout in ARM assembly
// Comparing to x86, the operands of ARM's CMP are reversed.
p.From.Reg = gc.SSARegNum(v.Args[1])
p.Reg = gc.SSARegNum(v.Args[0])
case ssa.OpARMMOVWload:
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_MEM
p.From.Reg = gc.SSARegNum(v.Args[0])
gc.AddAux(&p.From, v)
p.To.Type = obj.TYPE_REG
p.To.Reg = gc.SSARegNum(v)
case ssa.OpARMMOVWstore:
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = gc.SSARegNum(v.Args[1])
p.To.Type = obj.TYPE_MEM
p.To.Reg = gc.SSARegNum(v.Args[0])
gc.AddAux(&p.To, v)
case ssa.OpARMCALLstatic:
// TODO: deferreturn
p := gc.Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM
p.To.Name = obj.NAME_EXTERN
p.To.Sym = gc.Linksym(v.Aux.(*gc.Sym))
if gc.Maxarg < v.AuxInt {
gc.Maxarg = v.AuxInt
}
case ssa.OpVarDef:
gc.Gvardef(v.Aux.(*gc.Node))
case ssa.OpVarKill:
gc.Gvarkill(v.Aux.(*gc.Node))
case ssa.OpVarLive:
gc.Gvarlive(v.Aux.(*gc.Node))
case ssa.OpARMLessThan:
v.Fatalf("pseudo-op made it to output: %s", v.LongString())
default:
v.Unimplementedf("genValue not implemented: %s", v.LongString())
}
}
func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) {
s.SetLineno(b.Line)
switch b.Kind {
case ssa.BlockCall:
if b.Succs[0].Block() != next {
p := gc.Prog(obj.AJMP)
p.To.Type = obj.TYPE_BRANCH
s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()})
}
case ssa.BlockRet:
gc.Prog(obj.ARET)
case ssa.BlockARMLT:
p := gc.Prog(arm.ABLT)
p.To.Type = obj.TYPE_BRANCH
s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()})
p = gc.Prog(obj.AJMP)
p.To.Type = obj.TYPE_BRANCH
s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[1].Block()})
}
}