From 35b4cf868e2da677214d97a12d1f34ce6811a088 Mon Sep 17 00:00:00 2001 From: Arnold Schwaighofer Date: Fri, 31 May 2013 21:48:56 +0000 Subject: [PATCH] LoopVectorize: Change API call to get the backedge taken count Use ScalarEvolution's getBackedgeTakenCount API instead of getExitCount since that is really what we want to know. Using the more specific getExitCount was safe because we made sure that there is only one exiting block. No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183047 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Vectorize/LoopVectorize.cpp | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index 4482d13e596..3693f4a294e 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -1013,7 +1013,7 @@ LoopVectorizationLegality::RuntimePointerCheck::insert(ScalarEvolution *SE, const SCEV *Sc = SE->getSCEV(Ptr); const SCEVAddRecExpr *AR = dyn_cast(Sc); assert(AR && "Invalid addrec expression"); - const SCEV *Ex = SE->getExitCount(Lp, Lp->getLoopLatch()); + const SCEV *Ex = SE->getBackedgeTakenCount(Lp); const SCEV *ScEnd = AR->evaluateAtIteration(Ex, *SE); Pointers.push_back(Ptr); Starts.push_back(AR->getStart()); @@ -1456,7 +1456,7 @@ InnerLoopVectorizer::createEmptyLoop(LoopVectorizationLegality *Legal) { Type *IdxTy = Legal->getWidestInductionType(); // Find the loop boundaries. - const SCEV *ExitCount = SE->getExitCount(OrigLoop, OrigLoop->getLoopLatch()); + const SCEV *ExitCount = SE->getBackedgeTakenCount(OrigLoop); assert(ExitCount != SE->getCouldNotCompute() && "Invalid loop count"); // Get the total trip count from the count by adding 1. @@ -2584,7 +2584,7 @@ bool LoopVectorizationLegality::canVectorize() { TheLoop->getHeader()->getName() << "\n"); // ScalarEvolution needs to be able to find the exit count. - const SCEV *ExitCount = SE->getExitCount(TheLoop, Latch); + const SCEV *ExitCount = SE->getBackedgeTakenCount(TheLoop); if (ExitCount == SE->getCouldNotCompute()) { DEBUG(dbgs() << "LV: SCEV could not compute the loop exit count.\n"); return false;