1 files changed, 5 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/Utils/InlineFunction.cpp b/llvm/lib/Transforms/Utils/InlineFunction.cpp
index 2fb00f9..7e835bd 100644
--- a/llvm/lib/Transforms/Utils/InlineFunction.cpp
+++ b/llvm/lib/Transforms/Utils/InlineFunction.cpp
@@ -2194,9 +2194,11 @@ llvm::InlineResult llvm::InlineFunction(CallBase &CB, InlineFunctionInfo &IFI,
         CI->setTailCallKind(ChildTCK);
         InlinedMustTailCalls |= CI->isMustTailCall();
 
-        // Calls inlined through a 'nounwind' call site should be marked
-        // 'nounwind'.
-        if (MarkNoUnwind)
+        // Call sites inlined through a 'nounwind' call site should be
+        // 'nounwind' as well. However, avoid marking call sites explicitly
+        // where possible. This helps expose more opportunities for CSE after
+        // inlining, commonly when the callee is an intrinsic.
+        if (MarkNoUnwind && !CI->doesNotThrow())
           CI->setDoesNotThrow();
       }
     }