[llvm] r265503 - [RS4GC] Add a comment

[Sanjoy Das via llvm-commits]

Author: sanjoy
Date: Tue Apr  5 20:33:54 2016
New Revision: 265503

URL: http://llvm.org/viewvc/llvm-project?rev=265503&view=rev
Log:
[RS4GC] Add a comment

Modified:
    llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp?rev=265503&r1=265502&r2=265503&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp Tue Apr  5 20:33:54 2016
@@ -1366,6 +1366,10 @@ makeStatepointExplicitImpl(const CallSit
     Flags |= uint32_t(StatepointFlags::GCTransition);
     TransitionArgs = TransitionBundle->Inputs;
   }
+
+  // Instead of lowering calls to @llvm.experimental.deoptimize as normal calls
+  // with a return value, we lower then as never returning calls to
+  // __llvm_deoptimize that are followed by unreachable to get better codegen.
   bool IsDeoptimize = false;
 
   StatepointDirectives SD =