[llvm-commits] [llvm] r172734 - /llvm/trunk/include/llvm/Support/MathExtras.h

[Benjamin Kramer]

On 17.01.2013, at 19:27, Aaron Ballman <aaron at aaronballman.com> wrote:

> Author: aaronballman
> Date: Thu Jan 17 12:27:30 2013
> New Revision: 172734
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=172734&view=rev
> Log:
> Reverting back to the fallback instead of using popcnt; this instruction doesn't exist on all CPU architectures.  Fixes PR14982

popcntq isn't available on all _M_X64 machines either.

- Ben
> 
> 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=172734&r1=172733&r2=172734&view=diff
> ==============================================================================
> --- llvm/trunk/include/llvm/Support/MathExtras.h (original)
> +++ llvm/trunk/include/llvm/Support/MathExtras.h Thu Jan 17 12:27:30 2013
> @@ -303,8 +303,6 @@
> inline unsigned CountPopulation_32(uint32_t Value) {
> #if __GNUC__ >= 4
>   return __builtin_popcount(Value);
> -#elif defined(_MSC_VER)
> -  return __popcnt(Value);
> #else
>   uint32_t v = Value - ((Value >> 1) & 0x55555555);
>   v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
> 
> 
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits