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| author | Dan Gohman <gohman@apple.com> | 2008-04-28 19:51:27 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-04-28 19:51:27 +0000 |
| commit | 4c268c6241471b095206ae4d4f8211954a2ddd22 (patch) | |
| tree | 76709b13e649e24eebeeff8ecfc6220b467ca3bf /lib | |
| parent | e611b59c705ca8160bd77a8d9af3e4e8d7c10d9e (diff) | |
| download | external_llvm-4c268c6241471b095206ae4d4f8211954a2ddd22.zip external_llvm-4c268c6241471b095206ae4d4f8211954a2ddd22.tar.gz external_llvm-4c268c6241471b095206ae4d4f8211954a2ddd22.tar.bz2 | |
Fix DSE to not eliminate volatile loads with no uses.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50370 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/DeadStoreElimination.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp index f9d1205..89afa91 100644 --- a/lib/Transforms/Scalar/DeadStoreElimination.cpp +++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp @@ -326,9 +326,9 @@ bool DSE::handleEndBlock(BasicBlock& BB, // If we encounter a use of the pointer, it is no longer considered dead if (LoadInst* L = dyn_cast<LoadInst>(BBI)) { - // However, if this load is unused, we can go ahead and remove it, and - // not have to worry about it making our pointer undead! - if (L->use_empty()) { + // However, if this load is unused and not volatile, we can go ahead and remove it, + // and not have to worry about it making our pointer undead! + if (L->use_empty() && !L->isVolatile()) { MD.removeInstruction(L); // DCE instructions only used to calculate that load |