[llvm] r301767 - [X86] Clear KnownBits instead of reconstructing it. NFC

[Craig Topper via llvm-commits]

Author: ctopper
Date: Sun Apr 30 02:44:55 2017
New Revision: 301767

URL: http://llvm.org/viewvc/llvm-project?rev=301767&view=rev
Log:
[X86] Clear KnownBits instead of reconstructing it. NFC

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=301767&r1=301766&r2=301767&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Sun Apr 30 02:44:55 2017
@@ -26682,7 +26682,7 @@ void X86TargetLowering::computeKnownBits
          "Should use MaskedValueIsZero if you don't know whether Op"
          " is a target node!");
 
-  Known = KnownBits(BitWidth);   // Don't know anything.
+  Known.Zero.clearAllBits(); Known.One.clearAllBits();
   switch (Opc) {
   default: break;
   case X86ISD::ADD: