diff options
Diffstat (limited to 'lib/Analysis/DependenceAnalysis.cpp')
| -rw-r--r-- | lib/Analysis/DependenceAnalysis.cpp | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/lib/Analysis/DependenceAnalysis.cpp b/lib/Analysis/DependenceAnalysis.cpp index 6f9effa127..b655be5a13 100644 --- a/lib/Analysis/DependenceAnalysis.cpp +++ b/lib/Analysis/DependenceAnalysis.cpp @@ -3189,8 +3189,8 @@ DependenceAnalysis::tryDelinearize(const SCEV *SrcSCEV, const SCEV *DstSCEV, return false; SmallVector<const SCEV *, 4> SrcSubscripts, DstSubscripts, SrcSizes, DstSizes; - SrcAR->delinearize(*SE, SrcSubscripts, SrcSizes); - DstAR->delinearize(*SE, DstSubscripts, DstSizes); + const SCEV *RemainderS = SrcAR->delinearize(*SE, SrcSubscripts, SrcSizes); + const SCEV *RemainderD = DstAR->delinearize(*SE, DstSubscripts, DstSizes); int size = SrcSubscripts.size(); // Fail when there is only a subscript: that's a linearized access function. @@ -3210,6 +3210,21 @@ DependenceAnalysis::tryDelinearize(const SCEV *SrcSCEV, const SCEV *DstSCEV, if (SrcSizes[i] != DstSizes[i]) return false; + // When the difference in remainders is different than a constant it might be + // that the base address of the arrays is not the same. + const SCEV *DiffRemainders = SE->getMinusSCEV(RemainderS, RemainderD); + if (!isa<SCEVConstant>(DiffRemainders)) + return false; + + // Normalize the last dimension: integrate the size of the "scalar dimension" + // and the remainder of the delinearization. + DstSubscripts[size-1] = SE->getMulExpr(DstSubscripts[size-1], + DstSizes[size-1]); + SrcSubscripts[size-1] = SE->getMulExpr(SrcSubscripts[size-1], + SrcSizes[size-1]); + SrcSubscripts[size-1] = SE->getAddExpr(SrcSubscripts[size-1], RemainderS); + DstSubscripts[size-1] = SE->getAddExpr(DstSubscripts[size-1], RemainderD); + #ifndef NDEBUG DEBUG(errs() << "\nSrcSubscripts: "); for (int i = 0; i < size; i++) |