[llvm] r322985 - [SelectionDAG] Teach computeKnownBits about ATOMIC_CMP_SWAP_WITH_SUCCESS boolean return value

[Ulrich Weigand via llvm-commits]

Author: uweigand
Date: Fri Jan 19 12:47:14 2018
New Revision: 322985

URL: http://llvm.org/viewvc/llvm-project?rev=322985&view=rev
Log:
[SelectionDAG] Teach computeKnownBits about ATOMIC_CMP_SWAP_WITH_SUCCESS boolean return value

The second return value of ATOMIC_CMP_SWAP_WITH_SUCCESS is known to be a
boolean, and should therefore be treated by computeKnownBits just like
the second return values of SMULO / UMULO.

Differential Revision: https://reviews.llvm.org/D42067

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp?rev=322985&r1=322984&r2=322985&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp Fri Jan 19 12:47:14 2018
@@ -2442,6 +2442,7 @@ void SelectionDAG::computeKnownBits(SDVa
     break;
   case ISD::SMULO:
   case ISD::UMULO:
+  case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
     if (Op.getResNo() != 1)
       break;
     // The boolean result conforms to getBooleanContents.