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Fix bug: LICM/2003-02-27-PreheaderExitNodeUpdate.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5667 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-02-28 03:07:54 +00:00
parent 1db0a40037
commit 74cd04ea01
1 changed files with 5 additions and 1 deletions
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6
lib/Transforms/Utils/LoopSimplify.cpp
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@ -28,6 +28,7 @@
#include "llvm/Support/CFG.h"
#include "Support/SetOperations.h"
#include "Support/Statistic.h"
#include "Support/DepthFirstIterator.h"
namespace {
Statistic<> NumInserted("preheaders", "Number of pre-header nodes inserted");
@ -303,7 +304,10 @@ void Preheaders::RewriteLoopExitBlock(Loop *L, BasicBlock *Exit) {
// loop of L.
if (Loop *Parent = L->getParentLoop())
Parent->addBasicBlockToLoop(NewBB, getAnalysis<LoopInfo>());
L->changeExitBlock(Exit, NewBB); // Update exit block information
// Replace any instances of Exit with NewBB in this and any nested loops...
for (df_iterator<Loop*> I = df_begin(L), E = df_end(L); I != E; ++I)
I->changeExitBlock(Exit, NewBB); // Update exit block information
// Update dominator information... The blocks that dominate NewBB are the
// intersection of the dominators of predecessors, plus the block itself.