[llvm-commits] [llvm] r124283 - /llvm/trunk/lib/Analysis/ValueTracking.cpp

[Duncan Sands]

Author: baldrick
Date: Wed Jan 26 02:44:16 2011
New Revision: 124283

URL: http://llvm.org/viewvc/llvm-project?rev=124283&view=rev
Log:
APInt has a method for determining whether a number is a power of 2
which is more efficient than countPopulation - use it.

Modified:
    llvm/trunk/lib/Analysis/ValueTracking.cpp

Modified: llvm/trunk/lib/Analysis/ValueTracking.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ValueTracking.cpp?rev=124283&r1=124282&r2=124283&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/ValueTracking.cpp (original)
+++ llvm/trunk/lib/Analysis/ValueTracking.cpp Wed Jan 26 02:44:16 2011
@@ -656,7 +656,7 @@
 /// types and vectors of integers.
 bool llvm::isPowerOfTwo(Value *V, const TargetData *TD, unsigned Depth) {
   if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
-    return CI->getValue().countPopulation() == 1;
+    return CI->getValue().isPowerOf2();
   // TODO: Handle vector constants.
 
   // 1 << X is clearly a power of two if the one is not shifted off the end.  If