chromium/third_party/woff2/src/port.h

/* Copyright 2013 Google Inc. All Rights Reserved.

   Distributed under MIT license.
   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/

/* Helper function for bit twiddling and macros for branch prediction. */

#ifndef WOFF2_PORT_H_
#define WOFF2_PORT_H_

#include <assert.h>

namespace woff2 {

uint32;

inline int Log2Floor(uint32 n) { … }

} // namespace woff2

/* Compatibility with non-clang compilers. */
#ifndef __has_builtin
#define __has_builtin …
#endif

#if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || \
    (defined(__llvm__) && __has_builtin(__builtin_expect))
#define PREDICT_FALSE(x) …
#define PREDICT_TRUE(x) …
#else
#define PREDICT_FALSE …
#define PREDICT_TRUE …
#endif

#if (defined(__ARM_ARCH) && (__ARM_ARCH == 7)) || \
    (defined(M_ARM) && (M_ARM == 7)) || \
    defined(__aarch64__) || defined(__ARM64_ARCH_8__) || defined(__i386) || \
    defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)
#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
#define WOFF_LITTLE_ENDIAN
#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#define WOFF_BIG_ENDIAN
#endif  /* endianness */
#endif  /* CPU whitelist */

#endif  // WOFF2_PORT_H_