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Change 'while' loop to 'do' loop.

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Add a safety measure. It isn't safe to assume in ScalarEvolutionExpander that
all loops are in canonical form (but it should be safe for loops that have
AddRecs).
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llvm-svn: 52275
This commit is contained in:
Wojciech Matyjewicz 2008-06-14 16:48:22 +00:00
parent 327c3e7559
commit f66a7fe9de
1 changed files with 11 additions and 4 deletions
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15
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -185,14 +185,21 @@ Value *SCEVExpander::visitAddRecExpr(SCEVAddRecExpr *S) {
Loop *InsertPtLoop = LI.getLoopFor(MulInsertPt->getParent());
if (InsertPtLoop != L && InsertPtLoop &&
L->contains(InsertPtLoop->getHeader())) {
while (InsertPtLoop != L) {
do {
// If we cannot hoist the multiply out of this loop, don't.
if (!InsertPtLoop->isLoopInvariant(F)) break;
// Otherwise, move the insert point to the preheader of the loop.
MulInsertPt = InsertPtLoop->getLoopPreheader()->getTerminator();
BasicBlock *InsertPtLoopPH = InsertPtLoop->getLoopPreheader();
// If this loop hasn't got a preheader, we aren't able to hoist the
// multiply.
if (!InsertPtLoopPH)
break;
// Otherwise, move the insert point to the preheader.
MulInsertPt = InsertPtLoopPH->getTerminator();
InsertPtLoop = InsertPtLoop->getParentLoop();
}
} while (InsertPtLoop != L);
}
return InsertBinop(Instruction::Mul, I, F, MulInsertPt);