deps/jemalloc/include/msvc_compat/strings.h

   1 #ifndef strings_h
   2 #define strings_h
   3
   4 /* MSVC doesn't define ffs/ffsl. This dummy strings.h header is provided
   5  * for both */
   6 #include <intrin.h>
   7 #pragma intrinsic(_BitScanForward)
   8 static __forceinline int ffsl(long x)
   9 {
  10         unsigned long i;
  11
  12         if (_BitScanForward(&i, x))
  13                 return (i + 1);
  14         return (0);
  15 }
  16
  17 static __forceinline int ffs(int x)
  18 {
  19
  20         return (ffsl(x));
  21 }
  22
  23 #endif