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This fixes the bug in 175.vpr. It doesn't fix the

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other SPEC breakage.  I'll be reverting all recent
changes shortly, this checking is mostly so this
change doesn't get lost.

llvm-svn: 61402
This commit is contained in:
Dale Johannesen 2008-12-23 23:05:26 +00:00
parent e1a3d2da49
commit cd64ce7fc8
1 changed files with 9 additions and 2 deletions
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11
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -1627,10 +1627,17 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(const SCEVHandle &Stride,
// The common base is emitted in the loop preheader. But since we
// are reusing an IV, it has not been used to initialize the PHI node.
// Add it to the expression used to rewrite the uses.
// When this use is outside the loop, we earlier subtracted the
// common base, and are adding it back here. Use the same expression
// as before, rather than CommonBaseV, so DAGCombiner will zap it.
if (!isa<ConstantInt>(CommonBaseV) ||
!cast<ConstantInt>(CommonBaseV)->isZero())
RewriteExpr = SE->getAddExpr(RewriteExpr,
!cast<ConstantInt>(CommonBaseV)->isZero()) {
if (L->contains(User.Inst->getParent()))
RewriteExpr = SE->getAddExpr(RewriteExpr,
SE->getUnknown(CommonBaseV));
else
RewriteExpr = SE->getAddExpr(RewriteExpr, CommonExprs);
}
}
// Now that we know what we need to do, insert code before User for the