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Fix a minor bug which resulted in intermediate calculations

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using wider types than are necessary.

llvm-svn: 110241
This commit is contained in:
Dan Gohman 2010-08-04 19:52:50 +00:00
parent 670b397ecc
commit bafce59252
1 changed files with 1 additions and 1 deletions
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2
lib/Analysis/ScalarEvolution.cpp
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@ -1896,7 +1896,7 @@ const SCEV *ScalarEvolution::getUDivExpr(const SCEV *LHS,
// TODO: Generalize this to non-constants by using known-bits information.
const Type *Ty = LHS->getType();
unsigned LZ = RHSC->getValue()->getValue().countLeadingZeros();
unsigned MaxShiftAmt = getTypeSizeInBits(Ty) - LZ;
unsigned MaxShiftAmt = getTypeSizeInBits(Ty) - LZ - 1;
// For non-power-of-two values, effectively round the value up to the
// nearest power of two.
if (!RHSC->getValue()->getValue().isPowerOf2())