[llvm] r284937 - Use APInt::isAllOnesValue instead of popcnt. NFCI.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Sun Oct 23 10:09:44 2016
New Revision: 284937

URL: http://llvm.org/viewvc/llvm-project?rev=284937&view=rev
Log:
Use APInt::isAllOnesValue instead of popcnt. NFCI.

More obvious implementation and faster too.

Modified:
    llvm/trunk/lib/Target/X86/X86ShuffleDecodeConstantPool.cpp

Modified: llvm/trunk/lib/Target/X86/X86ShuffleDecodeConstantPool.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ShuffleDecodeConstantPool.cpp?rev=284937&r1=284936&r2=284937&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ShuffleDecodeConstantPool.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ShuffleDecodeConstantPool.cpp Sun Oct 23 10:09:44 2016
@@ -82,7 +82,7 @@ static bool extractConstantMask(const Co
 
     // Only treat the element as UNDEF if all bits are UNDEF, otherwise
     // treat it as zero.
-    if (EltUndef.countPopulation() == MaskEltSizeInBits) {
+    if (EltUndef.isAllOnesValue()) {
       UndefElts[i] = true;
       RawMask[i] = 0;
       continue;