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util: Add _BitScanForward intrinsic's declaration.
author
José Fonseca
<jfonseca@vmware.com>
Mon, 1 Jun 2009 15:58:34 +0000
(08:58 -0700)
committer
José Fonseca
<jfonseca@vmware.com>
Mon, 14 Sep 2009 19:12:01 +0000
(20:12 +0100)
It is missing in some Microsoft DDKs.
src/gallium/auxiliary/util/u_math.h
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diff --git
a/src/gallium/auxiliary/util/u_math.h
b/src/gallium/auxiliary/util/u_math.h
index
b12c97d
..
b428dc5
100644
(file)
--- 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 )
{