diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp')
-rw-r--r-- | lib/CodeGen/SelectionDAG/TargetLowering.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp index 142411d54d..cb35d58420 100644 --- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -1161,7 +1161,8 @@ TargetLowering::TargetLoweringOpt::ShrinkDemandedOp(SDValue Op, // 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)) { @@ -1174,7 +1175,9 @@ TargetLowering::TargetLoweringOpt::ShrinkDemandedOp(SDValue Op, 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); } } |