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Change the ExitBlocks list from being explicitly contained in the Loop

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structure to being dynamically computed on demand.  This makes updating
loop information MUCH easier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13045 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-04-18 22:14:10 +00:00
parent 7c8781e71f
commit f1ab4b4eac
7 changed files with 45 additions and 184 deletions
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23
lib/Transforms/Scalar/LoopUnroll.cpp
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@ -109,18 +109,6 @@ static inline void RemapInstruction(Instruction *I,
}
}
static void ChangeExitBlocksFromTo(Loop::iterator I, Loop::iterator E,
BasicBlock *Old, BasicBlock *New) {
for (; I != E; ++I) {
Loop *L = *I;
if (L->hasExitBlock(Old)) {
L->changeExitBlock(Old, New);
ChangeExitBlocksFromTo(L->begin(), L->end(), Old, New);
}
}
}
bool LoopUnroll::visitLoop(Loop *L) {
bool Changed = false;
@ -157,8 +145,7 @@ bool LoopUnroll::visitLoop(Loop *L) {
}
DEBUG(std::cerr << "UNROLLING!\n");
assert(L->getExitBlocks().size() == 1 && "Must have exactly one exit block!");
BasicBlock *LoopExit = L->getExitBlocks()[0];
BasicBlock *LoopExit = BI->getSuccessor(L->contains(BI->getSuccessor(0)));
// Create a new basic block to temporarily hold all of the cloned code.
BasicBlock *NewBlock = new BasicBlock();
@ -292,14 +279,6 @@ bool LoopUnroll::visitLoop(Loop *L) {
LI->removeBlock(Preheader);
LI->removeBlock(BB);
// If any loops used Preheader as an exit block, update them to use LoopExit.
if (Parent)
ChangeExitBlocksFromTo(Parent->begin(), Parent->end(),
Preheader, LoopExit);
else
ChangeExitBlocksFromTo(LI->begin(), LI->end(),
Preheader, LoopExit);
// If the preheader was the entry block of this function, move the exit block
// to be the new entry of the loop.
Function *F = LoopExit->getParent();