From d503644a4a070e84addb5bd6a31f0d62e3877d5f Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Sun, 30 Apr 2017 07:44:55 +0000
Subject: [PATCH] [X86] Clear KnownBits instead of reconstructing it. NFC

llvm-svn: 301767
---
 llvm/lib/Target/X86/X86ISelLowering.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 535be01abc5b..d767a7a7d2c7 100644
--- 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: