diff options
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 969a9b084d..c693386f9b 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())) |