diff options
| -rw-r--r-- | src/mesa/main/imports.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/src/mesa/main/imports.c b/src/mesa/main/imports.c index 3bf9b95a0b..de8456d3b7 100644 --- a/src/mesa/main/imports.c +++ b/src/mesa/main/imports.c @@ -535,12 +535,26 @@ int _mesa_ffs(int i) { #if defined(_WIN32) && !defined(__MINGW32__) - int bit; - if (i == 0) - return 0; - for (bit = 1; !(i & 1); bit++) - i >>= 1; - return bit; + register int bit = 0; + if (i != 0) { + if ((i & 0xffff) == 0) { + bit += 16; + i >>= 16; + } + if ((i & 0xff) == 0) { + bit += 8; + i >>= 8; + } + if ((i & 0xf) == 0) { + bit += 4; + i >>= 4; + } + while ((i & 1) == 0) { + bit++; + i >>= 1; + } + return bit; + } #elif defined(XFree86LOADER) && defined(IN_MODULE) return xf86ffs(i); #else |