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author | Chris Lattner <sabre@nondot.org> | 2004-04-18 05:38:05 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2004-04-18 05:38:05 +0000 |
commit | 24199db80ebd43398318b21d3e8d13e9bf72981d (patch) | |
tree | b73ebc3f53d3287b8f186f38f9dd073a1f0b79f7 /lib/Analysis/LoopInfo.cpp | |
parent | 4e55b7d2c62de7efa0147e0579980de8b1df9123 (diff) | |
download | external_llvm-24199db80ebd43398318b21d3e8d13e9bf72981d.zip external_llvm-24199db80ebd43398318b21d3e8d13e9bf72981d.tar.gz external_llvm-24199db80ebd43398318b21d3e8d13e9bf72981d.tar.bz2 |
Add a new method, add a check missing that caused a segfault if a loop didn't
have a canonical indvar
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13032 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/LoopInfo.cpp')
-rw-r--r-- | lib/Analysis/LoopInfo.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/Analysis/LoopInfo.cpp b/lib/Analysis/LoopInfo.cpp index 87c0723..38b9c66 100644 --- a/lib/Analysis/LoopInfo.cpp +++ b/lib/Analysis/LoopInfo.cpp @@ -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 = |