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Fix this code to correctly handle loops with multiple exits. Until 

now, this hasn't mattered, because ScalarEvolution hasn't been able
to compute trip counts for loops with multiple exits. But it will
soon.

llvm-svn: 73864
This commit is contained in:
Dan Gohman 2009-06-22 00:15:15 +00:00
parent 860379bcc2
commit 78ea89e161
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -299,11 +299,11 @@ void IndVarSimplify::RewriteLoopExitValues(Loop *L,
// If this instruction is dead now, delete it.
RecursivelyDeleteTriviallyDeadInstructions(Inst);
// See if this is a single-entry LCSSA PHI node. If so, we can (and
// have to) remove
// the PHI entirely. This is safe, because the NewVal won't be variant
// If we're inserting code into the exit block rather than the
// preheader, we can (and have to) remove the PHI entirely.
// This is safe, because the NewVal won't be variant
// in the loop, so we don't need an LCSSA phi node anymore.
if (NumPreds == 1) {
if (ExitBlocks.size() == 1) {
PN->replaceAllUsesWith(ExitVal);
RecursivelyDeleteTriviallyDeadInstructions(PN);
break;