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If the preheader of the loop was the entry block of the function, make sure

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that the exit block of the loop becomes the new entry block of the function.

This was causing a verifier assertion on 252.eon.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13039 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-04-18 17:38:42 +00:00
parent 998f44f859
commit cc43909bb6
1 changed files with 7 additions and 2 deletions
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9
lib/Transforms/Scalar/LoopUnroll.cpp
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@ -300,10 +300,15 @@ bool LoopUnroll::visitLoop(Loop *L) {
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();
if (Preheader == &F->front())
F->getBasicBlockList().splice(F->begin(), F->getBasicBlockList(), LoopExit);
// Actually delete the blocks now.
LoopExit->getParent()->getBasicBlockList().erase(Preheader);
LoopExit->getParent()->getBasicBlockList().erase(BB);
F->getBasicBlockList().erase(Preheader);
F->getBasicBlockList().erase(BB);
++NumUnrolled;
return true;