[llvm] r338516 - [X86] Use isNullConstant helper. NFCI.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Wed Aug  1 04:24:11 2018
New Revision: 338516

URL: http://llvm.org/viewvc/llvm-project?rev=338516&view=rev
Log:
[X86] Use isNullConstant helper. NFCI.

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=338516&r1=338515&r2=338516&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Wed Aug  1 04:24:11 2018
@@ -37928,8 +37928,7 @@ static SDValue combineFMA(SDNode *N, Sel
     // Look through extract_vector_elts. If it comes from an FNEG, create a
     // new extract from the FNEG input.
     if (V.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
-        isa<ConstantSDNode>(V.getOperand(1)) &&
-        cast<ConstantSDNode>(V.getOperand(1))->getZExtValue() == 0) {
+        isNullConstant(V.getOperand(1))) {
       if (SDValue NegVal = isFNEG(V.getOperand(0).getNode())) {
         NegVal = DAG.getBitcast(V.getOperand(0).getValueType(), NegVal);
         V = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SDLoc(V), V.getValueType(),