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| author | Dan Gohman <gohman@apple.com> | 2007-08-27 16:32:11 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2007-08-27 16:32:11 +0000 |
| commit | 9625d812c950ec38aefe87e1493ef14fcc1f6444 (patch) | |
| tree | efefbe0cffe86eca3c0c4a821bf82f4cfa027fd2 /llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | 90064ed445667f7789e5facf12ba22d7c56794df (diff) | |
| download | bcm5719-llvm-9625d812c950ec38aefe87e1493ef14fcc1f6444.tar.gz bcm5719-llvm-9625d812c950ec38aefe87e1493ef14fcc1f6444.zip | |
Make DAGCombiner's global alias analysis query more precise in the case
where both pointers have non-zero offsets.
llvm-svn: 41491
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index fda0589a6de..0514bc181be 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -4606,8 +4606,9 @@ bool DAGCombiner::isAlias(SDOperand Ptr1, int64_t Size1, if (CombinerGlobalAA) { // Use alias analysis information. - int Overlap1 = Size1 + SrcValueOffset1; - int Overlap2 = Size2 + SrcValueOffset2; + int64_t MinOffset = std::min(SrcValueOffset1, SrcValueOffset2); + int64_t Overlap1 = Size1 + SrcValueOffset1 - MinOffset; + int64_t Overlap2 = Size2 + SrcValueOffset2 - MinOffset; AliasAnalysis::AliasResult AAResult = AA.alias(SrcValue1, Overlap1, SrcValue2, Overlap2); if (AAResult == AliasAnalysis::NoAlias) |
