func (mach X86) ConversionOp(code gen.RegCoder, oper uint16, resultType types.T, source values.Operand) (result values.Operand) {
if oper == opers.Wrap {
source.Type = types.I32 // short mov; useful zeroExt flag
reg, zeroExt := mach.opMaybeResultReg(code, source, false)
return values.TempRegOperand(resultType, reg, zeroExt)
}
reg, zeroExt := mach.opMaybeResultReg(code, source, false)
// TODO: for int<->float ops: borrow source reg, allocate target reg
switch oper {
case opers.ExtendS:
Movsxd.opFromReg(code, 0, reg, reg)
result = values.TempRegOperand(resultType, reg, false)
case opers.ExtendU:
if !zeroExt {
Mov.opFromReg(code, types.I32, reg, reg)
}
result = values.TempRegOperand(resultType, reg, false)
case opers.Mote:
Cvts2sSSE.opFromReg(code, source.Type, reg, reg)
result = values.TempRegOperand(resultType, reg, false)
case opers.TruncS:
panic(fmt.Errorf("%s.trunc_s/%s not implemented", resultType, source.Type))
case opers.TruncU:
panic(fmt.Errorf("%s.trunc_u/%s not implemented", resultType, source.Type))
case opers.ConvertS:
Cvtsi2sSSE.opReg(code, resultType, source.Type, regResult, reg)
code.FreeReg(source.Type, reg)
result = values.TempRegOperand(resultType, regResult, false)
case opers.ConvertU:
if source.Type == types.I32 {
if !zeroExt {
Mov.opFromReg(code, types.I32, reg, reg)
}
Cvtsi2sSSE.opReg(code, resultType, types.I64, regResult, reg)
} else {
mach.opConvertUnsignedI64ToFloat(code, resultType, reg)
}
code.FreeReg(source.Type, reg)
result = values.TempRegOperand(resultType, regResult, false)
case opers.Reinterpret:
if source.Type.Category() == types.Int {
MovSSE.opFromReg(code, source.Type, regResult, reg)
} else {
MovSSE.opToReg(code, source.Type, regResult, reg)
}
code.FreeReg(source.Type, reg)
result = values.TempRegOperand(resultType, regResult, true)
}
return
}
func (mach X86) binaryShiftOp(code gen.RegCoder, index uint8, a, b values.Operand) values.Operand {
insn := binaryShiftInsns[index]
var targetReg regs.R
switch b.Storage {
case values.Imm:
targetReg, _ = mach.opMaybeResultReg(code, a, true)
insn.imm.op(code, b.Type, targetReg, uint8(b.ImmValue()))
default:
if b.Storage.IsReg() && b.Reg() == regShiftCount {
targetReg, _ = mach.opMaybeResultReg(code, a, false)
defer code.Discard(b)
} else {
if code.RegAllocated(types.I32, regShiftCount) {
targetReg, _ = mach.opMaybeResultReg(code, a, true)
if targetReg == regShiftCount {
Mov.opFromReg(code, a.Type, regResult, regShiftCount)
targetReg = regResult
defer code.FreeReg(types.I32, regShiftCount)
} else {
// unknown operand in regShiftCount
Mov.opFromReg(code, types.I64, regScratch, regShiftCount)
defer Mov.opFromReg(code, types.I64, regShiftCount, regScratch)
}
} else {
code.AllocSpecificReg(types.I32, regShiftCount)
defer code.FreeReg(types.I32, regShiftCount)
targetReg, _ = mach.opMaybeResultReg(code, a, true)
}
b.Type = types.I32 // TODO: 8-bit mov
mach.OpMove(code, regShiftCount, b, false)
}
insn.opReg(code, a.Type, targetReg)
}
return values.TempRegOperand(a.Type, targetReg, true)
}