commit d56c0cb634aa6812916307ad6f6a72e8589864b1
author Chris Lattner <sabre@nondot.org> Sat Oct 31 17:48:31 2009 +0000
committer Chris Lattner <sabre@nondot.org> Sat Oct 31 17:48:31 2009 +0000
tree d6729cae8d03a2f6e35e92264db908dd30d5d3e5
parent 80a0f8f856c40fcf82dafc313f76f2e7a64913c5

add a comment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85671 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/InstructionCombining.cpp

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index c2194c4..d1561d6 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -10998,6 +10998,10 @@
         PN.setIncomingValue(i, VB);
         PN.setIncomingBlock(j, BBA);
         PN.setIncomingValue(j, VA);
+        // NOTE: Instcombine normally would want us to "return &PN" if we
+        // modified any of the operands of an instruction.  However, since we
+        // aren't adding or removing uses (just rearranging them) we don't do
+        // this in this case.
       }
     }