diff options
| author | Dan Gohman <gohman@apple.com> | 2008-03-10 20:42:19 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-03-10 20:42:19 +0000 |
| commit | 76c605b18ee74e2c521a02431ab9e1ce6912d827 (patch) | |
| tree | 61ec582ca5f8969ba7815c3f4f041a5a963db487 /lib/CodeGen | |
| parent | 62fcc41d958bf9b8cee43271789136cb7100705f (diff) | |
Fix mul expansion to check the correct number of bits for
zero extension when checking if an unsigned multiply is
safe.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48171 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index abd569b208..1ef19ff50f 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -6436,10 +6436,9 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){ unsigned InnerBitSize = RH.getValueSizeInBits(); unsigned LHSSB = DAG.ComputeNumSignBits(Op.getOperand(0)); unsigned RHSSB = DAG.ComputeNumSignBits(Op.getOperand(1)); - if (DAG.MaskedValueIsZero(Op.getOperand(0), - APInt::getHighBitsSet(OuterBitSize, LHSSB)) && - DAG.MaskedValueIsZero(Op.getOperand(1), - APInt::getHighBitsSet(OuterBitSize, RHSSB))) { + APInt HighMask = APInt::getHighBitsSet(OuterBitSize, InnerBitSize); + if (DAG.MaskedValueIsZero(Node->getOperand(0), HighMask) && + DAG.MaskedValueIsZero(Node->getOperand(1), HighMask)) { // The inputs are both zero-extended. if (HasUMUL_LOHI) { // We can emit a umul_lohi. |