libwebp: update to 0.4.4

third_party/libwebp/utils/endian_inl.h

 // Copyright 2014 Google Inc. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the COPYING file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS. All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // Endian related functions.
@@ skipping 17 matching lines @@
 
 #if defined(WORDS_BIGENDIAN)
 #define HToLE32 BSwap32
 #define HToLE16 BSwap16
 #else
 #define HToLE32(x) (x)
 #define HToLE16(x) (x)
 #endif
 
 #if !defined(HAVE_CONFIG_H)
-// clang-3.3 and gcc-4.3 have builtin functions for swap32/swap64
-#if LOCAL_GCC_PREREQ(4,3) || LOCAL_CLANG_PREREQ(3,3)
+#if LOCAL_GCC_PREREQ(4,8) || __has_builtin(__builtin_bswap16)
+#define HAVE_BUILTIN_BSWAP16
+#endif
+#if LOCAL_GCC_PREREQ(4,3) || __has_builtin(__builtin_bswap32)
 #define HAVE_BUILTIN_BSWAP32
+#endif
+#if LOCAL_GCC_PREREQ(4,3) || __has_builtin(__builtin_bswap64)
 #define HAVE_BUILTIN_BSWAP64
 #endif
-// clang-3.3 and gcc-4.8 have a builtin function for swap16
-#if LOCAL_GCC_PREREQ(4,8) || LOCAL_CLANG_PREREQ(3,3)
-#define HAVE_BUILTIN_BSWAP16
-#endif
 #endif  // !HAVE_CONFIG_H
 
 static WEBP_INLINE uint16_t BSwap16(uint16_t x) {
 #if defined(HAVE_BUILTIN_BSWAP16)
   return __builtin_bswap16(x);
 #elif defined(_MSC_VER)
   return _byteswap_ushort(x);
 #else
   // gcc will recognize a 'rorw $8, ...' here:
   return (x >> 8) | ((x & 0xff) << 8);
@@ skipping 34 matching lines @@
   return (uint64_t)_byteswap_uint64(x);
 #else  // generic code for swapping 64-bit values (suggested by bdb@)
   x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32);
   x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16);
   x = ((x & 0xff00ff00ff00ff00ull) >>  8) | ((x & 0x00ff00ff00ff00ffull) <<  8);
   return x;
 #endif  // HAVE_BUILTIN_BSWAP64
 }
 
 #endif  // WEBP_UTILS_ENDIAN_INL_H_