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-rw-r--r--src/gallium/auxiliary/util/u_math.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index b12c97dfb4..b428dc544c 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -354,7 +354,9 @@ util_is_pot(unsigned x)
* Find first bit set in word. Least significant bit is 1.
* Return 0 if no bits set.
*/
-#if defined(_MSC_VER) && _MSC_VER >= 1300
+#if defined(_MSC_VER) && _MSC_VER >= 1300 && (_M_IX86 || _M_AMD64 || _M_IA64)
+unsigned char _BitScanForward(unsigned long* Index, unsigned long Mask);
+#pragma intrinsic(_BitScanForward)
static INLINE
unsigned long ffs( unsigned long u )
{