[X86] Clear KnownBits instead of reconstructing it. NFC

llvm-svn: 301767
2017-04-30 07:44:55 +00:00 · 2017-04-30 07:44:55 +00:00 · d503644a4a
parent 9d8cd821e6
commit d503644a4a
1 changed files with 1 additions and 1 deletions
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@ -26682,7 +26682,7 @@ void X86TargetLowering::computeKnownBitsForTargetNode(const SDValue Op,
         "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: