gallium/util: Use HAVE___BUILTIN_FFS* macros.

Make use of the builtin ffs macros and split out ffsll
to a seperate block.  Needed for at least OpenBSD which
does not have ffsll in libc.

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 8f62cac664ed08f5eccc9d1e1417dc4bcd46e110..3d27a59e8c0bf579528cdb1e58a6825e24895cc9 100644 (file)
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -383,13 +383,27 @@ unsigned ffs( unsigned u )
 
    return i;
 }
-#elif defined(__MINGW32__) || defined(PIPE_OS_ANDROID)
+#elif defined(__MINGW32__) || defined(PIPE_OS_ANDROID) || \
+    defined(HAVE___BUILTIN_FFS)
 #define ffs __builtin_ffs
-#define ffsll __builtin_ffsll
 #endif
 
 #endif /* FFS_DEFINED */
 
+/**
+ * Find first bit set in long long.  Least significant bit is 1.
+ * Return 0 if no bits set.
+ */
+#ifndef FFSLL_DEFINED
+#define FFSLL_DEFINED 1
+
+#if defined(__MINGW32__) || defined(PIPE_OS_ANDROID) || \
+    defined(HAVE___BUILTIN_FFSLL)
+#define ffsll __builtin_ffsll
+#endif
+
+#endif /* FFSLL_DEFINED */
+
 /**
  * Find last bit set in a word.  The least significant bit is 1.
  * Return 0 if no bits are set.