From c5b59c23b59592429d785abae362449b27bf2875 Mon Sep 17 00:00:00 2001 From: Silviu Baranga Date: Tue, 10 May 2016 12:28:49 +0000 Subject: [PATCH] [LAA] Use re-written SCEV expressions when computing distances This removes a redundant stride versioning step (we already do it in getPtrStride, so it has no effect) and uses PSE to get the SCEV expressions for the source and destination (this might have changed when getPtrStride was called). I discovered this through code inspection, and couldn't produce a regression test for it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269052 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/LoopAccessAnalysis.cpp | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/lib/Analysis/LoopAccessAnalysis.cpp b/lib/Analysis/LoopAccessAnalysis.cpp index 630ff7639b5..173b03178b5 100644 --- a/lib/Analysis/LoopAccessAnalysis.cpp +++ b/lib/Analysis/LoopAccessAnalysis.cpp @@ -1158,20 +1158,15 @@ MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx, BPtr->getType()->getPointerAddressSpace()) return Dependence::Unknown; - const SCEV *AScev = replaceSymbolicStrideSCEV(PSE, Strides, APtr); - const SCEV *BScev = replaceSymbolicStrideSCEV(PSE, Strides, BPtr); - int StrideAPtr = getPtrStride(PSE, APtr, InnermostLoop, Strides, true); int StrideBPtr = getPtrStride(PSE, BPtr, InnermostLoop, Strides, true); - const SCEV *Src = AScev; - const SCEV *Sink = BScev; + const SCEV *Src = PSE.getSCEV(APtr); + const SCEV *Sink = PSE.getSCEV(BPtr); // If the induction step is negative we have to invert source and sink of the // dependence. if (StrideAPtr < 0) { - //Src = BScev; - //Sink = AScev; std::swap(APtr, BPtr); std::swap(Src, Sink); std::swap(AIsWrite, BIsWrite); -- 2.50.1