From 24199db80ebd43398318b21d3e8d13e9bf72981d Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 18 Apr 2004 05:38:05 +0000 Subject: [PATCH] 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 --- lib/Analysis/LoopInfo.cpp | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/lib/Analysis/LoopInfo.cpp b/lib/Analysis/LoopInfo.cpp index 87c0723312d..38b9c669999 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(Inc->getOperand(0)); BasicBlock *BackedgeBlock = -- 2.34.1