Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 128 insertions, 0 deletions

diff --git a/media/libtheora/lib/ocintrin.h b/media/libtheora/lib/ocintrin.h
new file mode 100644
index 0000000000..b200ceafce
--- /dev/null
+++ b/media/libtheora/lib/ocintrin.h
@@ -0,0 +1,128 @@
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE.   *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
+ *                                                                  *
+ * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009                *
+ * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
+ *                                                                  *
+ ********************************************************************
+
+  function:
+    last mod: $Id$
+
+ ********************************************************************/
+
+/*Some common macros for potential platform-specific optimization.*/
+#include <math.h>
+#if !defined(_ocintrin_H)
+# define _ocintrin_H (1)
+
+/*Some specific platforms may have optimized intrinsic or inline assembly
+   versions of these functions which can substantially improve performance.
+  We define macros for them to allow easy incorporation of these non-ANSI
+   features.*/
+
+/*Note that we do not provide a macro for abs(), because it is provided as a
+   library function, which we assume is translated into an intrinsic to avoid
+   the function call overhead and then implemented in the smartest way for the
+   target platform.
+  With modern gcc (4.x), this is true: it uses cmov instructions if the
+   architecture supports it and branchless bit-twiddling if it does not (the
+   speed difference between the two approaches is not measurable).
+  Interestingly, the bit-twiddling method was patented in 2000 (US 6,073,150)
+   by Sun Microsystems, despite prior art dating back to at least 1996:
+   http://web.archive.org/web/19961201174141/www.x86.org/ftp/articles/pentopt/PENTOPT.TXT
+  On gcc 3.x, however, our assumption is not true, as abs() is translated to a
+   conditional jump, which is horrible on deeply piplined architectures (e.g.,
+   all consumer architectures for the past decade or more).
+  Also be warned that -C*abs(x) where C is a constant is mis-optimized as
+   abs(C*x) on every gcc release before 4.2.3.
+  See bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34130 */
+
+/*Modern gcc (4.x) can compile the naive versions of min and max with cmov if
+   given an appropriate architecture, but the branchless bit-twiddling versions
+   are just as fast, and do not require any special target architecture.
+  Earlier gcc versions (3.x) compiled both code to the same assembly
+   instructions, because of the way they represented ((_b)>(_a)) internally.*/
+#define OC_MAXI(_a,_b)      ((_a)-((_a)-(_b)&-((_b)>(_a))))
+#define OC_MINI(_a,_b)      ((_a)+((_b)-(_a)&-((_b)<(_a))))
+/*Clamps an integer into the given range.
+  If _a>_c, then the lower bound _a is respected over the upper bound _c (this
+   behavior is required to meet our documented API behavior).
+  _a: The lower bound.
+  _b: The value to clamp.
+  _c: The upper boud.*/
+#define OC_CLAMPI(_a,_b,_c) (OC_MAXI(_a,OC_MINI(_b,_c)))
+#define OC_CLAMP255(_x)     ((unsigned char)((((_x)<0)-1)&((_x)|-((_x)>255))))
+/*This has a chance of compiling branchless, and is just as fast as the
+   bit-twiddling method, which is slightly less portable, since it relies on a
+   sign-extended rightshift, which is not guaranteed by ANSI (but present on
+   every relevant platform).*/
+#define OC_SIGNI(_a)        (((_a)>0)-((_a)<0))
+/*Slightly more portable than relying on a sign-extended right-shift (which is
+   not guaranteed by ANSI), and just as fast, since gcc (3.x and 4.x both)
+   compile it into the right-shift anyway.*/
+#define OC_SIGNMASK(_a)     (-((_a)<0))
+/*Divides an integer by a power of two, truncating towards 0.
+  _dividend: The integer to divide.
+  _shift:    The non-negative power of two to divide by.
+  _rmask:    (1<<_shift)-1*/
+#define OC_DIV_POW2(_dividend,_shift,_rmask)\
+  ((_dividend)+(OC_SIGNMASK(_dividend)&(_rmask))>>(_shift))
+/*Divides _x by 65536, truncating towards 0.*/
+#define OC_DIV2_16(_x) OC_DIV_POW2(_x,16,0xFFFF)
+/*Divides _x by 2, truncating towards 0.*/
+#define OC_DIV2(_x) OC_DIV_POW2(_x,1,0x1)
+/*Divides _x by 8, truncating towards 0.*/
+#define OC_DIV8(_x) OC_DIV_POW2(_x,3,0x7)
+/*Divides _x by 16, truncating towards 0.*/
+#define OC_DIV16(_x) OC_DIV_POW2(_x,4,0xF)
+/*Right shifts _dividend by _shift, adding _rval, and subtracting one for
+   negative dividends first.
+  When _rval is (1<<_shift-1), this is equivalent to division with rounding
+   ties away from zero.*/
+#define OC_DIV_ROUND_POW2(_dividend,_shift,_rval)\
+  ((_dividend)+OC_SIGNMASK(_dividend)+(_rval)>>(_shift))
+/*Divides a _x by 2, rounding towards even numbers.*/
+#define OC_DIV2_RE(_x) ((_x)+((_x)>>1&1)>>1)
+/*Divides a _x by (1<<(_shift)), rounding towards even numbers.*/
+#define OC_DIV_POW2_RE(_x,_shift) \
+  ((_x)+((_x)>>(_shift)&1)+((1<<(_shift))-1>>1)>>(_shift))
+/*Swaps two integers _a and _b if _a>_b.*/
+#define OC_SORT2I(_a,_b) \
+  do{ \
+    int t__; \
+    t__=((_a)^(_b))&-((_b)<(_a)); \
+    (_a)^=t__; \
+    (_b)^=t__; \
+  } \
+  while(0)
+
+/*Accesses one of four (signed) bytes given an index.
+  This can be used to avoid small lookup tables.*/
+#define OC_BYTE_TABLE32(_a,_b,_c,_d,_i) \
+  ((signed char) \
+   (((_a)&0xFF|((_b)&0xFF)<<8|((_c)&0xFF)<<16|((_d)&0xFF)<<24)>>(_i)*8))
+/*Accesses one of eight (unsigned) nibbles given an index.
+  This can be used to avoid small lookup tables.*/
+#define OC_UNIBBLE_TABLE32(_a,_b,_c,_d,_e,_f,_g,_h,_i) \
+  ((((_a)&0xF|((_b)&0xF)<<4|((_c)&0xF)<<8|((_d)&0xF)<<12| \
+   ((_e)&0xF)<<16|((_f)&0xF)<<20|((_g)&0xF)<<24|((_h)&0xF)<<28)>>(_i)*4)&0xF)
+
+
+
+/*All of these macros should expect floats as arguments.*/
+#define OC_MAXF(_a,_b)      ((_a)<(_b)?(_b):(_a))
+#define OC_MINF(_a,_b)      ((_a)>(_b)?(_b):(_a))
+#define OC_CLAMPF(_a,_b,_c) (OC_MINF(_a,OC_MAXF(_b,_c)))
+#define OC_FABSF(_f)        ((float)fabs(_f))
+#define OC_SQRTF(_f)        ((float)sqrt(_f))
+#define OC_POWF(_b,_e)      ((float)pow(_b,_e))
+#define OC_LOGF(_f)         ((float)log(_f))
+#define OC_IFLOORF(_f)      ((int)floor(_f))
+#define OC_ICEILF(_f)       ((int)ceil(_f))
+
+#endif