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Add a new method, add a check missing that caused a segfault if a loop didn't

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have a canonical indvar


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13032 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-04-18 05:38:05 +00:00
parent 4e55b7d2c6
commit 24199db80e
1 changed files with 14 additions and 0 deletions
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14
lib/Analysis/LoopInfo.cpp
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@ -315,6 +315,19 @@ void LoopInfo::changeTopLevelLoop(Loop *OldLoop, Loop *NewLoop) {
"Loops already embedded into a subloop!");
}
/// removeLoop - This removes the specified top-level loop from this loop info
/// object. The loop is not deleted, as it will presumably be inserted into
/// another loop.
Loop *LoopInfo::removeLoop(iterator I) {
assert(I != end() && "Cannot remove end iterator!");
Loop *L = *I;
assert(L->getParentLoop() == 0 && "Not a top-level loop!");
TopLevelLoops.erase(TopLevelLoops.begin() + (I-begin()));
return L;
}
//===----------------------------------------------------------------------===//
// APIs for simple analysis of the loop.
//
@ -409,6 +422,7 @@ Value *Loop::getTripCount() const {
// Canonical loops will end with a 'setne I, V', where I is the incremented
// canonical induction variable and V is the trip count of the loop.
Instruction *Inc = getCanonicalInductionVariableIncrement();
if (Inc == 0) return 0;
PHINode *IV = cast<PHINode>(Inc->getOperand(0));
BasicBlock *BackedgeBlock =