// Search for the smallest integer type with free casts to and from
// Op's type. For expedience, just check power-of-2 integer types.
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
- unsigned SmallVTBits = BitWidth - Demanded.countLeadingZeros();
+ unsigned DemandedSize = BitWidth - Demanded.countLeadingZeros();
+ unsigned SmallVTBits = DemandedSize;
if (!isPowerOf2_32(SmallVTBits))
SmallVTBits = NextPowerOf2(SmallVTBits);
for (; SmallVTBits < BitWidth; SmallVTBits = NextPowerOf2(SmallVTBits)) {
Op.getNode()->getOperand(0)),
DAG.getNode(ISD::TRUNCATE, dl, SmallVT,
Op.getNode()->getOperand(1)));
- SDValue Z = DAG.getNode(ISD::ZERO_EXTEND, dl, Op.getValueType(), X);
+ bool NeedZext = DemandedSize > SmallVTBits;
+ SDValue Z = DAG.getNode(NeedZext ? ISD::ZERO_EXTEND : ISD::ANY_EXTEND,
+ dl, Op.getValueType(), X);
return CombineTo(Op, Z);
}
}
--- /dev/null
+; RUN: llc < %s
+
+define void @main() {
+if.end:
+ br label %block.i.i
+
+block.i.i:
+ %tmpbb = load i8* undef
+ %tmp54 = zext i8 %tmpbb to i64
+ %tmp59 = and i64 %tmp54, 8
+ %tmp60 = add i64 %tmp59, 3691045929300498764
+ %tmp62 = sub i64 %tmp60, 3456506383779105993
+ %tmp63 = xor i64 1050774804270620004, %tmp62
+ %tmp65 = xor i64 %tmp62, 234539545521392771
+ %tmp67 = or i64 %tmp65, %tmp63
+ %tmp71 = xor i64 %tmp67, 6781485823212740913
+ %tmp72 = trunc i64 %tmp71 to i32
+ %tmp74 = lshr i32 2, %tmp72
+ store i32 %tmp74, i32* undef
+ br label %block.i.i
+}