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);