[llvm-commits] [llvm] r172645 - /llvm/trunk/include/llvm/Support/MathExtras.h

[Michael J. Spencer]

Author: mspencer
Date: Wed Jan 16 13:52:12 2013
New Revision: 172645

URL: http://llvm.org/viewvc/llvm-project?rev=172645&view=rev
Log:
[Support] Add MSVC intrinsic for CountPopulation.

Patch by Jakub Staszak.

Modified:
    llvm/trunk/include/llvm/Support/MathExtras.h

Modified: llvm/trunk/include/llvm/Support/MathExtras.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/MathExtras.h?rev=172645&r1=172644&r2=172645&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Support/MathExtras.h (original)
+++ llvm/trunk/include/llvm/Support/MathExtras.h Wed Jan 16 13:52:12 2013
@@ -299,6 +299,8 @@
 inline unsigned CountPopulation_32(uint32_t Value) {
 #if __GNUC__ >= 4
   return __builtin_popcount(Value);
+#elif _MSC_VER
+  return __popcnt(Value);
 #else
   uint32_t v = Value - ((Value >> 1) & 0x55555555);
   v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
@@ -311,6 +313,8 @@
 inline unsigned CountPopulation_64(uint64_t Value) {
 #if __GNUC__ >= 4
   return __builtin_popcountll(Value);
+#elif _MSC_VER
+  return __popcnt64(Value);
 #else
   uint64_t v = Value - ((Value >> 1) & 0x5555555555555555ULL);
   v = (v & 0x3333333333333333ULL) + ((v >> 2) & 0x3333333333333333ULL);