diff options
| -rw-r--r-- | lib/Target/ARM/ARMISelLowering.cpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 015b023dca..a63cb27b1e 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -10184,9 +10184,19 @@ void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op, APInt &KnownOne, const SelectionDAG &DAG, unsigned Depth) const { - KnownZero = KnownOne = APInt(KnownOne.getBitWidth(), 0); + unsigned BitWidth = KnownOne.getBitWidth(); + KnownZero = KnownOne = APInt(BitWidth, 0); switch (Op.getOpcode()) { default: break; + case ARMISD::ADDC: + case ARMISD::ADDE: + case ARMISD::SUBC: + case ARMISD::SUBE: + // These nodes' second result is a boolean + if (Op.getResNo() == 0) + break; + KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1); + break; case ARMISD::CMOV: { // Bits are known zero/one if known on the LHS and RHS. DAG.ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); |