TBR=mstarzinger@chromium.org
Review URL: https://chromiumcodereview.appspot.com/
10198020
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11428
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00
}
int CompilerIntrinsics::CountSetBits(uint32_t value) {
- // __popcnt is only supported from VS2008.
-#define _MSC_VER_VS2008 1500
-#if _MSC_VER >= _MSC_VER_VS2008
- return __popcnt(value);
-#else
// Manually count set bits.
value = ((value >> 1) & 0x55555555) + (value & 0x55555555);
value = ((value >> 2) & 0x33333333) + (value & 0x33333333);
value = ((value >> 8) & 0x00ff00ff) + (value & 0x00ff00ff);
value = ((value >> 16) & 0x0000ffff) + (value & 0x0000ffff);
return value;
-#endif
-#undef _MSC_VER_VS2008
}
#else