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| author | Chris Lattner <sabre@nondot.org> | 2008-12-07 00:25:15 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-12-07 00:25:15 +0000 |
| commit | 5df5b4cc2eca2e8437b7b821d553fde9151b1fed (patch) | |
| tree | 8f5193147203a52f61eab5eb22f5bc2608404bf7 /llvm/lib/Transforms | |
| parent | f5891941b46720a530bcc6041142e451b5f4dde7 (diff) | |
| download | bcm5719-llvm-5df5b4cc2eca2e8437b7b821d553fde9151b1fed.tar.gz bcm5719-llvm-5df5b4cc2eca2e8437b7b821d553fde9151b1fed.zip | |
don't bother touching volatile stores, they will just return clobber on
everything interesting anyway.
llvm-svn: 60640
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp index 92431c3fe31..8b40da656ee 100644 --- a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp +++ b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp @@ -90,6 +90,11 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) { // If we find a store or a free, get it's memory dependence. if (!isa<StoreInst>(Inst) && !isa<FreeInst>(Inst)) continue; + + // Don't molest volatile stores or do queries that will return "clobber". + if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) + if (SI->isVolatile()) + continue; MemDepResult InstDep = MD.getDependency(Inst); |
