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Bail out early, before modifying anything.

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llvm-svn: 42120
This commit is contained in:
Devang Patel 2007-09-19 00:11:01 +00:00
parent 9806df698b
commit 03df2adc31
1 changed files with 5 additions and 4 deletions
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9
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@ -542,6 +542,11 @@ bool LoopIndexSplit::processOneIterationLoop(SplitInfo &SD) {
if (!safeSplitCondition(SD))
return false;
BasicBlock *Latch = L->getLoopLatch();
BranchInst *BR = dyn_cast<BranchInst>(Latch->getTerminator());
if (!BR)
return false;
// Update CFG.
// Replace index variable with split value in loop body. Loop body is executed
@ -549,11 +554,7 @@ bool LoopIndexSplit::processOneIterationLoop(SplitInfo &SD) {
IndVar->replaceAllUsesWith(SD.SplitValue);
// Remove Latch to Header edge.
BasicBlock *Latch = L->getLoopLatch();
BasicBlock *LatchSucc = NULL;
BranchInst *BR = dyn_cast<BranchInst>(Latch->getTerminator());
if (!BR)
return false;
Header->removePredecessor(Latch);
for (succ_iterator SI = succ_begin(Latch), E = succ_end(Latch);
SI != E; ++SI) {