From 89e7b356f270e29c2e9e18c6bbd30e5925585f06 Mon Sep 17 00:00:00 2001 From: Nadav Rotem Date: Fri, 19 Oct 2012 01:24:18 +0000 Subject: vectorizer: Add support for reading and writing from the same memory location. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166255 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Vectorize/LoopVectorize.cpp | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) (limited to 'lib/Transforms/Vectorize/LoopVectorize.cpp') diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index f5c9bb31e0..5152ec11e5 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -715,6 +715,7 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) { ValueVector Reads; ValueVector Writes; + SmallPtrSet AnalyzedPtrs; unsigned NumPhis = 0; for (BasicBlock::iterator it = BB.begin(), e = BB.end(); it != e; ++it) { Instruction *I = it; @@ -766,7 +767,10 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) { DEBUG(dbgs() << "LV: Found a non-simple load.\n"); return false; } - GetUnderlyingObjects(Ld->getPointerOperand(), Reads, DL); + + Value* Ptr = Ld->getPointerOperand(); + if (AnalyzedPtrs.insert(Ptr)) + GetUnderlyingObjects(Ptr, Reads, DL); } // Record store pointers. Abort on all other instructions that write to @@ -778,7 +782,10 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) { DEBUG(dbgs() << "LV: Found a non-simple store.\n"); return false; } - GetUnderlyingObjects(St->getPointerOperand(), Writes, DL); + + Value* Ptr = St->getPointerOperand(); + if (AnalyzedPtrs.insert(Ptr)) + GetUnderlyingObjects(St->getPointerOperand(), Writes, DL); } // We still don't handle functions. -- cgit v1.2.3-18-g5258