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recommit 96626, evidence that it broke things appears

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to be spurious



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96662 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2010-02-19 07:14:22 +00:00
parent 01a5bee716
commit 45a2d7d44a
3 changed files with 41 additions and 0 deletions
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lib/Transforms/Scalar/IndVarSimplify.cpp
+7
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@@ -246,6 +246,13 @@ void IndVarSimplify::RewriteLoopExitValues(Loop *L,
if (!PN->getType()->isIntegerTy() && !PN->getType()->isPointerTy())
continue;
// It's necessary to tell ScalarEvolution about this explicitly so that
// it can walk the def-use list and forget all SCEVs, as it may not be
// watching the PHI itself. Once the new exit value is in place, there
// may not be a def-use connection between the loop and every instruction
// which got a SCEVAddRecExpr for that loop.
SE->forgetValue(PN);
// Iterate over all of the values in all the PHI nodes.
for (unsigned i = 0; i != NumPreds; ++i) {
// If the value being merged in is not integer or is not defined