Update FLAC to 1.3.1

src/libFLAC/include/private/bitmath.h

 /* libFLAC - Free Lossless Audio Codec library
- * Copyright (C) 2001,2002,2003,2004,2005,2006,2007  Josh Coalson
+ * Copyright (C) 2001-2009  Josh Coalson
+ * Copyright (C) 2011-2014  Xiph.Org Foundation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * - Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
  * - Redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FLAC__PRIVATE__BITMATH_H
 #define FLAC__PRIVATE__BITMATH_H
 
 #include "FLAC/ordinals.h"
+#include "FLAC/assert.h"
 
-unsigned FLAC__bitmath_ilog2(FLAC__uint32 v);
-unsigned FLAC__bitmath_ilog2_wide(FLAC__uint64 v);
+/* for CHAR_BIT */
+#include <limits.h>
+#include "share/compat.h"
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1400)
+#include <intrin.h> /* for _BitScanReverse* */
+#endif
+
+/* Will never be emitted for MSVC, GCC, Intel compilers */
+static inline unsigned int FLAC__clz_soft_uint32(unsigned int word)
+{
+    static const unsigned char byte_to_unary_table[] = {
+    8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
+    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    };
+
+    return (word) > 0xffffff ? byte_to_unary_table[(word) >> 24] :
+    (word) > 0xffff ? byte_to_unary_table[(word) >> 16] + 8 :
+    (word) > 0xff ? byte_to_unary_table[(word) >> 8] + 16 :
+    byte_to_unary_table[(word)] + 24;
+}
+
+static inline unsigned int FLAC__clz_uint32(FLAC__uint32 v)
+{
+/* Never used with input 0 */
+    FLAC__ASSERT(v > 0);
+#if defined(__INTEL_COMPILER)
+    return _bit_scan_reverse(v) ^ 31U;
+#elif defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+/* This will translate either to (bsr ^ 31U), clz , ctlz, cntlz, lzcnt depending on
+ * -march= setting or to a software routine in exotic machines. */
+    return __builtin_clz(v);
+#elif defined(_MSC_VER) && (_MSC_VER >= 1400)
+    {
+        unsigned long idx;
+        _BitScanReverse(&idx, v);
+        return idx ^ 31U;
+    }
+#else
+    return FLAC__clz_soft_uint32(v);
+#endif
+}
+
+/* This one works with input 0 */
+static inline unsigned int FLAC__clz2_uint32(FLAC__uint32 v)
+{
+    if (!v)
+        return 32;
+    return FLAC__clz_uint32(v);
+}
+
+/* An example of what FLAC__bitmath_ilog2() computes:
+ *
+ * ilog2( 0) = assertion failure
+ * ilog2( 1) = 0
+ * ilog2( 2) = 1
+ * ilog2( 3) = 1
+ * ilog2( 4) = 2
+ * ilog2( 5) = 2
+ * ilog2( 6) = 2
+ * ilog2( 7) = 2
+ * ilog2( 8) = 3
+ * ilog2( 9) = 3
+ * ilog2(10) = 3
+ * ilog2(11) = 3
+ * ilog2(12) = 3
+ * ilog2(13) = 3
+ * ilog2(14) = 3
+ * ilog2(15) = 3
+ * ilog2(16) = 4
+ * ilog2(17) = 4
+ * ilog2(18) = 4
+ */
+
+static inline unsigned FLAC__bitmath_ilog2(FLAC__uint32 v)
+{
+    FLAC__ASSERT(v > 0);
+#if defined(__INTEL_COMPILER)
+    return _bit_scan_reverse(v);
+#elif defined(_MSC_VER) && (_MSC_VER >= 1400)
+    {
+        unsigned long idx;
+        _BitScanReverse(&idx, v);
+        return idx;
+    }
+#else
+    return sizeof(FLAC__uint32) * CHAR_BIT  - 1 - FLAC__clz_uint32(v);
+#endif
+}
+
+
+#ifdef FLAC__INTEGER_ONLY_LIBRARY /* Unused otherwise */
+
+static inline unsigned FLAC__bitmath_ilog2_wide(FLAC__uint64 v)
+{
+    FLAC__ASSERT(v > 0);
+#if defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+    return sizeof(FLAC__uint64) * CHAR_BIT - 1 - __builtin_clzll(v);
+/* Sorry, only supported in x64/Itanium.. and both have fast FPU which makes integer-only encoder pointless */
+#elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && (defined(_M_IA64) || defined(_M_X64))
+    {
+        unsigned long idx;
+        _BitScanReverse64(&idx, v);
+        return idx;
+    }
+#else
+/*  Brain-damaged compilers will use the fastest possible way that is,
+    de Bruijn sequences (http://supertech.csail.mit.edu/papers/debruijn.pdf)
+    (C) Timothy B. Terriberry (tterribe@xiph.org) 2001-2009 CC0 (Public domain).
+*/
+    {
+        static const unsigned char DEBRUIJN_IDX64[64]={
+            0, 1, 2, 7, 3,13, 8,19, 4,25,14,28, 9,34,20,40,
+            5,17,26,38,15,46,29,48,10,31,35,54,21,50,41,57,
+            63, 6,12,18,24,27,33,39,16,37,45,47,30,53,49,56,
+            62,11,23,32,36,44,52,55,61,22,43,51,60,42,59,58
+        };
+        v|= v>>1;
+        v|= v>>2;
+        v|= v>>4;
+        v|= v>>8;
+        v|= v>>16;
+        v|= v>>32;
+        v= (v>>1)+1;
+        return DEBRUIJN_IDX64[v*0x218A392CD3D5DBF>>58&0x3F];
+    }
+#endif
+}
+#endif
+
 unsigned FLAC__bitmath_silog2(int v);
 unsigned FLAC__bitmath_silog2_wide(FLAC__int64 v);
 
 #endif