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Fix GetMinTrailingZeros for SCEVSignExtend and SCEVZeroExtendExpr to

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return the correct value when the cast operand is all zeros. This ought
to be pretty rare, because it would mean that the regular SCEV folding
routines missed a case, though there are cases they might legitimately
miss. Also, it's unlikely anything currently using GetMinTrailingZeros
cares about this case.

llvm-svn: 71532
This commit is contained in:
Dan Gohman 2009-05-12 01:23:18 +00:00
parent 96cd1decc6
commit e55d6c4c8a
1 changed files with 2 additions and 2 deletions
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4
lib/Analysis/ScalarEvolution.cpp
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@ -1984,13 +1984,13 @@ static uint32_t GetMinTrailingZeros(SCEVHandle S, const ScalarEvolution &SE) {
if (const SCEVZeroExtendExpr *E = dyn_cast<SCEVZeroExtendExpr>(S)) {
uint32_t OpRes = GetMinTrailingZeros(E->getOperand(), SE);
return OpRes == SE.getTypeSizeInBits(E->getOperand()->getType()) ?
SE.getTypeSizeInBits(E->getOperand()->getType()) : OpRes;
SE.getTypeSizeInBits(E->getType()) : OpRes;
}
if (const SCEVSignExtendExpr *E = dyn_cast<SCEVSignExtendExpr>(S)) {
uint32_t OpRes = GetMinTrailingZeros(E->getOperand(), SE);
return OpRes == SE.getTypeSizeInBits(E->getOperand()->getType()) ?
SE.getTypeSizeInBits(E->getOperand()->getType()) : OpRes;
SE.getTypeSizeInBits(E->getType()) : OpRes;
}
if (const SCEVAddExpr *A = dyn_cast<SCEVAddExpr>(S)) {