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-rw-r--r--src/mesa/main/imports.c26
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