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

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 acc84e5aa0
commit f8b161bcd1
1 changed files with 9 additions and 2 deletions
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11
llvm/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