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

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There may be a single outside predecessor and
still need a new loop-preheader if the predecessor has multiple
successors.

llvm-svn: 5656
This commit is contained in:
Chris Lattner 2003-02-27 21:51:38 +00:00
parent e8dda81b22
commit e1d4fb3c2c
1 changed files with 7 additions and 0 deletions
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7
lib/Analysis/LoopInfo.cpp
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@ -200,6 +200,13 @@ BasicBlock *Loop::getLoopPreheader() const {
return 0; // Multiple predecessors outside the loop
Out = *PI;
}
// Make sure there is only one exit out of the preheader...
succ_iterator SI = succ_begin(Out);
++SI;
if (SI != succ_end(Out))
return 0; // Multiple exits from the block, must not be a preheader.
// If there is exactly one preheader, return it. If there was zero, then Out
// is still null.