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Fix PR1499.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37472 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lauro Ramos Venancio 2007-06-06 17:08:48 +00:00
parent 96dd9a8b1b
commit d0499af703
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1346,6 +1346,10 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask,
// Signed shift right.
APInt DemandedMaskIn(DemandedMask.shl(ShiftAmt));
// If any of the "high bits" are demanded, we should set the sign bit as
// demanded.
if (DemandedMask.countLeadingZeros() <= ShiftAmt)
DemandedMaskIn.set(BitWidth-1);
if (SimplifyDemandedBits(I->getOperand(0),
DemandedMaskIn,
RHSKnownZero, RHSKnownOne, Depth+1))