gallium/util: Don't implement u_bit_scan64 on MSVC.

As ffsll doesn't exist in MSVC yet, and u_bit_scan64 is only used by
radeonsi which is never built with MSVC.

This is just a stop-gap fix to unbreak MSVC build until we refactor these
mathematical portability wrappers into src/util.

Trivial.

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 7687100ae65722c3650146e65997f09028a91860..5db5b6699617a493c0c5f9e7c940c8ab98d2002b 100644 (file)
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -584,6 +584,7 @@ u_bit_scan(unsigned *mask)
    return i;
 }
 
+#ifndef _MSC_VER
 static INLINE int
 u_bit_scan64(uint64_t *mask)
 {
@@ -591,6 +592,7 @@ u_bit_scan64(uint64_t *mask)
    *mask &= ~(1llu << i);
    return i;
 }
+#endif
 
 /**
  * Return float bits.