From 99abb2728b1fed706c892d93327ebb3bcc0c939c Mon Sep 17 00:00:00 2001
From: Sanjoy Das <sanjoy@playingwithpointers.com>
Date: Wed, 6 Apr 2016 01:33:54 +0000
Subject: [RS4GC] Add a comment

llvm-svn: 265503
---
 llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'llvm/lib/Transforms/Scalar')

diff --git a/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp b/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
index db1af57d9b5..6e6a776ea7e 100644
--- a/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
+++ b/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
@@ -1366,6 +1366,10 @@ makeStatepointExplicitImpl(const CallSite CS, /* to replace */
     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 =
-- 
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