&ArgChains[0], ArgChains.size());
}
+/// SplatByte - Distribute ByteVal over NumBits bits.
+static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) {
+ APInt Val = APInt(NumBits, ByteVal);
+ unsigned Shift = 8;
+ for (unsigned i = NumBits; i > 8; i >>= 1) {
+ Val = (Val << Shift) | Val;
+ Shift <<= 1;
+ }
+ return Val;
+}
+
/// getMemsetValue - Vectorized representation of the memset value
/// operand.
static SDValue getMemsetValue(SDValue Value, EVT VT, SelectionDAG &DAG,
unsigned NumBits = VT.getScalarType().getSizeInBits();
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) {
- APInt Val = APInt(NumBits, C->getZExtValue() & 255);
- unsigned Shift = 8;
- for (unsigned i = NumBits; i > 8; i >>= 1) {
- Val = (Val << Shift) | Val;
- Shift <<= 1;
- }
+ APInt Val = SplatByte(NumBits, C->getZExtValue() & 255);
if (VT.isInteger())
return DAG.getConstant(Val, VT);
return DAG.getConstantFP(APFloat(Val), VT);
}
- const TargetLowering &TLI = DAG.getTargetLoweringInfo();
Value = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Value);
- unsigned Shift = 8;
- for (unsigned i = NumBits; i > 8; i >>= 1) {
- Value = DAG.getNode(ISD::OR, dl, VT,
- DAG.getNode(ISD::SHL, dl, VT, Value,
- DAG.getConstant(Shift,
- TLI.getShiftAmountTy())),
- Value);
- Shift <<= 1;
+ if (NumBits > 8) {
+ // Use a multiplication with 0x010101... to extend the input to the
+ // required length.
+ APInt Magic = SplatByte(NumBits, 0x01);
+ Value = DAG.getNode(ISD::MUL, dl, VT, Value, DAG.getConstant(Magic, VT));
}
return Value;
call void @llvm.memset.i32( i8* undef, i8 %c, i32 76, i32 1 ) nounwind
unreachable
}
+
+declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
+
+define void @t3(i8* nocapture %s, i8 %a) nounwind {
+entry:
+ tail call void @llvm.memset.p0i8.i32(i8* %s, i8 %a, i32 8, i32 1, i1 false)
+ ret void
+; CHECK: t3:
+; CHECK: imull $16843009
+}
+