Reapply 95979, a compile-time speedup, now that the bug it exposed is fixed.

llvm-svn: 96005
This commit is contained in:
Dan Gohman 2010-02-12 19:35:25 +00:00
parent 006952d39d
commit cbf5771473

View File

@ -1902,10 +1902,10 @@ static void CollectSubexprs(const SCEV *S, const SCEVConstant *C,
} else if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
// Split a non-zero base out of an addrec.
if (!AR->getStart()->isZero()) {
CollectSubexprs(AR->getStart(), C, Ops, SE);
CollectSubexprs(SE.getAddRecExpr(SE.getIntegerSCEV(0, AR->getType()),
AR->getStepRecurrence(SE),
AR->getLoop()), C, Ops, SE);
CollectSubexprs(AR->getStart(), C, Ops, SE);
return;
}
} else if (const SCEVMulExpr *Mul = dyn_cast<SCEVMulExpr>(S)) {