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| author | Devang Patel <dpatel@apple.com> | 2011-10-20 17:31:18 +0000 |
|---|---|---|
| committer | Devang Patel <dpatel@apple.com> | 2011-10-20 17:31:18 +0000 |
| commit | e6de9f30cbdbeca7f6632420f2cd5728d9a2dc1c (patch) | |
| tree | 6d679901e2830e7b13f94e4b5acafbd9f381f43f /lib/CodeGen/MachineLICM.cpp | |
| parent | 01817c39a9d7ff864d0b5de4941eec93d2f9e3a8 (diff) | |
| download | external_llvm-e6de9f30cbdbeca7f6632420f2cd5728d9a2dc1c.zip external_llvm-e6de9f30cbdbeca7f6632420f2cd5728d9a2dc1c.tar.gz external_llvm-e6de9f30cbdbeca7f6632420f2cd5728d9a2dc1c.tar.bz2 | |
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142592 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineLICM.cpp')
| -rw-r--r-- | lib/CodeGen/MachineLICM.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/CodeGen/MachineLICM.cpp b/lib/CodeGen/MachineLICM.cpp index 969a9b0..c693386 100644 --- a/lib/CodeGen/MachineLICM.cpp +++ b/lib/CodeGen/MachineLICM.cpp @@ -788,7 +788,9 @@ bool MachineLICM::IsLICMCandidate(MachineInstr &I) { // If it is load then check if it is guaranteed to execute by making sure that // it dominates all exiting blocks. If it doesn't, then there is a path out of - // the loop which does not execute this load, so we can't hoist it. + // the loop which does not execute this load, so we can't hoist it. Loads + // from constant memory are not safe to speculate all the time, for example + // indexed load from a jump table. // Stores and side effects are already checked by isSafeToMove. if (I.getDesc().mayLoad() && !isLoadFromGOT(I) && !IsGuaranteedToExecute(I.getParent())) |