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| author | Eli Friedman <eli.friedman@gmail.com> | 2011-07-27 01:08:30 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2011-07-27 01:08:30 +0000 |
| commit | 8a552bb85a5e9a6c250c0a899941fbd3ae7b5006 (patch) | |
| tree | 9577dd8f2a50604b5dd734cc240adb81390776ec /lib/Transforms/Scalar/DeadStoreElimination.cpp | |
| parent | 751bef77d0ac9776ac5133bd806be4a22ea4fa55 (diff) | |
| download | external_llvm-8a552bb85a5e9a6c250c0a899941fbd3ae7b5006.zip external_llvm-8a552bb85a5e9a6c250c0a899941fbd3ae7b5006.tar.gz external_llvm-8a552bb85a5e9a6c250c0a899941fbd3ae7b5006.tar.bz2 | |
Misc mid-level changes for new 'fence' instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136205 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/DeadStoreElimination.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/DeadStoreElimination.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp index e6089a9..a645f92 100644 --- a/lib/Transforms/Scalar/DeadStoreElimination.cpp +++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp @@ -665,7 +665,7 @@ bool DSE::handleEndBlock(BasicBlock &BB) { continue; } - + AliasAnalysis::Location LoadedLoc; // If we encounter a use of the pointer, it is no longer considered dead @@ -675,9 +675,12 @@ bool DSE::handleEndBlock(BasicBlock &BB) { LoadedLoc = AA->getLocation(V); } else if (MemTransferInst *MTI = dyn_cast<MemTransferInst>(BBI)) { LoadedLoc = AA->getLocationForSource(MTI); - } else { - // Not a loading instruction. + } else if (!BBI->mayReadOrWriteMemory()) { + // Instruction doesn't touch memory. continue; + } else { + // Unknown inst; assume it clobbers everything. + break; } // Remove any allocas from the DeadPointer set that are loaded, as this |