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Correct rewriting of exit blocks after my last patch

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13048 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-04-18 22:27:10 +00:00
parent 343c0cfa19
commit 59fb87d469
1 changed files with 8 additions and 3 deletions
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11
lib/Transforms/Utils/LoopSimplify.cpp
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@ -73,7 +73,7 @@ namespace {
bool ProcessLoop(Loop *L);
BasicBlock *SplitBlockPredecessors(BasicBlock *BB, const char *Suffix,
const std::vector<BasicBlock*> &Preds);
void RewriteLoopExitBlock(Loop *L, BasicBlock *Exit);
BasicBlock *RewriteLoopExitBlock(Loop *L, BasicBlock *Exit);
void InsertPreheaderForLoop(Loop *L);
Loop *SeparateNestedLoop(Loop *L);
void InsertUniqueBackedgeBlock(Loop *L);
@ -158,7 +158,11 @@ bool LoopSimplify::ProcessLoop(Loop *L) {
for (pred_iterator PI = pred_begin(ExitBlock), PE = pred_end(ExitBlock);
PI != PE; ++PI)
if (!L->contains(*PI)) {
RewriteLoopExitBlock(L, ExitBlock);
BasicBlock *NewBB = RewriteLoopExitBlock(L, ExitBlock);
for (unsigned j = i; j != ExitBlocks.size(); ++j)
if (ExitBlocks[j] == ExitBlock)
ExitBlocks[j] = NewBB;
NumInserted++;
Changed = true;
break;
@ -387,7 +391,7 @@ void LoopSimplify::InsertPreheaderForLoop(Loop *L) {
/// RewriteLoopExitBlock - Ensure that the loop preheader dominates all exit
/// blocks. This method is used to split exit blocks that have predecessors
/// outside of the loop.
void LoopSimplify::RewriteLoopExitBlock(Loop *L, BasicBlock *Exit) {
BasicBlock *LoopSimplify::RewriteLoopExitBlock(Loop *L, BasicBlock *Exit) {
DominatorSet &DS = getAnalysis<DominatorSet>();
std::vector<BasicBlock*> LoopBlocks;
@ -405,6 +409,7 @@ void LoopSimplify::RewriteLoopExitBlock(Loop *L, BasicBlock *Exit) {
// Update dominator information (set, immdom, domtree, and domfrontier)
UpdateDomInfoForRevectoredPreds(NewBB, LoopBlocks);
return NewBB;
}
/// AddBlockAndPredsToSet - Add the specified block, and all of its