[llvm] r372158 - [SimplifyDemandedBits] Use APInt::intersects to instead of ANDing and comparing to 0 separately. NFC

[Craig Topper via llvm-commits]

Author: ctopper
Date: Tue Sep 17 11:19:02 2019
New Revision: 372158

URL: http://llvm.org/viewvc/llvm-project?rev=372158&view=rev
Log:
[SimplifyDemandedBits] Use APInt::intersects to instead of ANDing and comparing to 0 separately. NFC

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

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp?rev=372158&r1=372157&r2=372158&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp Tue Sep 17 11:19:02 2019
@@ -1285,7 +1285,7 @@ bool TargetLowering::SimplifyDemandedBit
       // out) are never demanded.
       // TODO - support non-uniform vector amounts.
       if (Op0.getOpcode() == ISD::SRL) {
-        if ((DemandedBits & APInt::getLowBitsSet(BitWidth, ShAmt)) == 0) {
+        if (!DemandedBits.intersects(APInt::getLowBitsSet(BitWidth, ShAmt))) {
           if (ConstantSDNode *SA2 =
                   isConstOrConstSplat(Op0.getOperand(1), DemandedElts)) {
             if (SA2->getAPIntValue().ult(BitWidth)) {
@@ -1392,7 +1392,8 @@ bool TargetLowering::SimplifyDemandedBit
       if (Op0.getOpcode() == ISD::SHL) {
         if (ConstantSDNode *SA2 =
                 isConstOrConstSplat(Op0.getOperand(1), DemandedElts)) {
-          if ((DemandedBits & APInt::getHighBitsSet(BitWidth, ShAmt)) == 0) {
+          if (!DemandedBits.intersects(
+                  APInt::getHighBitsSet(BitWidth, ShAmt))) {
             if (SA2->getAPIntValue().ult(BitWidth)) {
               unsigned C1 = SA2->getZExtValue();
               unsigned Opc = ISD::SRL;