Add a comment for r167040.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167046 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index eacba90..d6016d2 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -6145,6 +6145,10 @@
// Compute the constraint code and ConstraintType to use.
TLI.ComputeConstraintToUse(OpInfo, SDValue());
+ // Ideally, we would only check against memory constraints. However, the
+ // meaning of an other constraint can be target-specific and we can't easily
+ // reason about it. Therefore, be conservative and set MayLoad/MayStore
+ // for other constriants as well.
if (OpInfo.ConstraintType == TargetLowering::C_Memory ||
OpInfo.ConstraintType == TargetLowering::C_Other) {
if (OpInfo.Type == InlineAsm::isInput)