[llvm] r372103 - [X86] Use APInt::getLowBitsSet helper. NFCI.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Tue Sep 17 03:51:30 2019
New Revision: 372103

URL: http://llvm.org/viewvc/llvm-project?rev=372103&view=rev
Log:
[X86] Use APInt::getLowBitsSet helper. NFCI.

Also avoids a static analyzer warning about out of range shifts.

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=372103&r1=372102&r2=372103&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Tue Sep 17 03:51:30 2019
@@ -20301,7 +20301,8 @@ X86TargetLowering::BuildSDIVPow2(SDNode
   SDLoc DL(N);
   SDValue N0 = N->getOperand(0);
   SDValue Zero = DAG.getConstant(0, DL, VT);
-  SDValue Pow2MinusOne = DAG.getConstant((1ULL << Lg2) - 1, DL, VT);
+  APInt Lg2Mask = APInt::getLowBitsSet(VT.getSizeInBits(), Lg2);
+  SDValue Pow2MinusOne = DAG.getConstant(Lg2Mask, DL, VT);
 
   // If N0 is negative, we need to add (Pow2 - 1) to it before shifting right.
   SDValue Cmp = DAG.getSetCC(DL, MVT::i8, N0, Zero, ISD::SETLT);