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Fix PR582. The rewriter can move casts around, which invalidated the

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BB iterator.  This fixes Transforms/IndVarsSimplify/2005-06-15-InstMoveCrash.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22221 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-06-15 21:29:31 +00:00
parent 73d31b9598
commit 4bd09d70cc
1 changed files with 11 additions and 1 deletions
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12
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -551,7 +551,7 @@ void IndVarSimplify::RewriteLoopExitValues(Loop *L) {
for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i)
if (LI->getLoopFor(L->getBlocks()[i]) == L) { // Not in a subloop...
BasicBlock *BB = L->getBlocks()[i];
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E;) {
if (I->getType()->isInteger()) { // Is an integer instruction
SCEVHandle SH = SE->getSCEV(I);
if (SH->hasComputableLoopEvolution(L) || // Varies predictably
@ -571,6 +571,10 @@ void IndVarSimplify::RewriteLoopExitValues(Loop *L) {
if (!isa<SCEVCouldNotCompute>(ExitValue)) {
Changed = true;
++NumReplaced;
// Remember the next instruction. The rewriter can move code
// around in some cases.
BasicBlock::iterator NextI = I; ++NextI;
Value *NewVal = Rewriter.expandCodeFor(ExitValue, InsertPt,
I->getType());
@ -582,10 +586,16 @@ void IndVarSimplify::RewriteLoopExitValues(Loop *L) {
// If this instruction is dead now, schedule it to be removed.
if (I->use_empty())
InstructionsToDelete.insert(I);
I = NextI;
continue; // Skip the ++I
}
}
}
}
// Next instruction. Continue instruction skips this.
++I;
}
}
DeleteTriviallyDeadInstructions(InstructionsToDelete);