ryujinx/SDL
1
0
Fork 0
mirror of https://github.com/Ryujinx/SDL.git synced 2024-12-23 09:55:35 +00:00
Code Issues Packages Projects Releases Wiki Activity

Implement SDL_MostSignificantBitIndex32 using MSVC intrinsics

Browse source
This commit is contained in:
Cameron Gutman 2021-01-03 14:02:55 -06:00
parent 014f507c40
commit 91a831e2d0
1 changed files with 6 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
include/SDL_bits.h
View file

@ -73,6 +73,12 @@ SDL_MostSignificantBitIndex32(Uint32 x)
return -1;
}
return 31 - _SDL_clz_watcom(x);
#elif defined(_MSC_VER)
unsigned long index;
if (_BitScanReverse(&index, x)) {
return index;
}
return -1;
#else
/* Based off of Bit Twiddling Hacks by Sean Eron Anderson
* <seander@cs.stanford.edu>, released in the public domain.