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Diffstat (limited to 'modules/brotli/dec/port.h')
| -rw-r--r-- | modules/brotli/dec/port.h | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/modules/brotli/dec/port.h b/modules/brotli/dec/port.h new file mode 100644 index 000000000..19b457c75 --- /dev/null +++ b/modules/brotli/dec/port.h @@ -0,0 +1,252 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Macros for compiler / platform specific features and build options. + + Build options are: + * BROTLI_BUILD_32_BIT disables 64-bit optimizations + * BROTLI_BUILD_64_BIT forces to use 64-bit optimizations + * BROTLI_BUILD_BIG_ENDIAN forces to use big-endian optimizations + * BROTLI_BUILD_ENDIAN_NEUTRAL disables endian-aware optimizations + * BROTLI_BUILD_LITTLE_ENDIAN forces to use little-endian optimizations + * BROTLI_BUILD_MODERN_COMPILER forces to use modern compilers built-ins, + features and attributes + * BROTLI_BUILD_PORTABLE disables dangerous optimizations, like unaligned + read and overlapping memcpy; this reduces decompression speed by 5% + * BROTLI_DEBUG dumps file name and line number when decoder detects stream + or memory error + * BROTLI_ENABLE_LOG enables asserts and dumps various state information + */ + +#ifndef BROTLI_DEC_PORT_H_ +#define BROTLI_DEC_PORT_H_ + +#if defined(BROTLI_ENABLE_LOG) || defined(BROTLI_DEBUG) +#include <assert.h> +#include <stdio.h> +#endif + +/* Compatibility with non-clang compilers. */ +#ifndef __has_builtin +#define __has_builtin(x) 0 +#endif + +#ifndef __has_attribute +#define __has_attribute(x) 0 +#endif + +#ifndef __has_feature +#define __has_feature(x) 0 +#endif + +#if defined(__arm__) || defined(__thumb__) || \ + defined(_M_ARM) || defined(_M_ARMT) +#define BROTLI_TARGET_ARM +#if (defined(__ARM_ARCH) && (__ARM_ARCH >= 7)) || \ + (defined(M_ARM) && (M_ARM >= 7)) +#define BROTLI_TARGET_ARMV7 +#endif /* ARMv7 */ +#if defined(__aarch64__) +#define BROTLI_TARGET_ARMV8 +#endif /* ARMv8 */ +#endif /* ARM */ + +#if defined(__i386) || defined(_M_IX86) +#define BROTLI_TARGET_X86 +#endif + +#if defined(__x86_64__) || defined(_M_X64) +#define BROTLI_TARGET_X64 +#endif + +#if defined(__PPC64__) +#define BROTLI_TARGET_POWERPC64 +#endif + +#if defined(__GNUC__) && defined(__GNUC_MINOR__) +#define BROTLI_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) +#else +#define BROTLI_GCC_VERSION 0 +#endif + +#if defined(__ICC) +#define BROTLI_ICC_VERSION __ICC +#else +#define BROTLI_ICC_VERSION 0 +#endif + +#if defined(BROTLI_BUILD_MODERN_COMPILER) +#define BROTLI_MODERN_COMPILER 1 +#elif (BROTLI_GCC_VERSION > 300) || (BROTLI_ICC_VERSION >= 1600) +#define BROTLI_MODERN_COMPILER 1 +#else +#define BROTLI_MODERN_COMPILER 0 +#endif + +#ifdef BROTLI_BUILD_PORTABLE +#define BROTLI_ALIGNED_READ (!!1) +#elif defined(BROTLI_TARGET_X86) || defined(BROTLI_TARGET_X64) || \ + defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8) +/* Allow unaligned read only for whitelisted CPUs. */ +#define BROTLI_ALIGNED_READ (!!0) +#else +#define BROTLI_ALIGNED_READ (!!1) +#endif + +/* Define "PREDICT_TRUE" and "PREDICT_FALSE" macros for capable compilers. + +To apply compiler hint, enclose the branching condition into macros, like this: + + if (PREDICT_TRUE(zero == 0)) { + // main execution path + } else { + // compiler should place this code outside of main execution path + } + +OR: + + if (PREDICT_FALSE(something_rare_or_unexpected_happens)) { + // compiler should place this code outside of main execution path + } + +*/ +#if BROTLI_MODERN_COMPILER || __has_builtin(__builtin_expect) +#define PREDICT_TRUE(x) (__builtin_expect(!!(x), 1)) +#define PREDICT_FALSE(x) (__builtin_expect(x, 0)) +#else +#define PREDICT_FALSE(x) (x) +#define PREDICT_TRUE(x) (x) +#endif + +/* IS_CONSTANT macros returns true for compile-time constant expressions. */ +#if BROTLI_MODERN_COMPILER || __has_builtin(__builtin_constant_p) +#define IS_CONSTANT(x) (!!__builtin_constant_p(x)) +#else +#define IS_CONSTANT(x) (!!0) +#endif + +#if BROTLI_MODERN_COMPILER || __has_attribute(always_inline) +#define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((always_inline)) +#else +#define ATTRIBUTE_ALWAYS_INLINE +#endif + +#if defined(_WIN32) || defined(__CYGWIN__) +#define ATTRIBUTE_VISIBILITY_HIDDEN +#elif BROTLI_MODERN_COMPILER || __has_attribute(visibility) +#define ATTRIBUTE_VISIBILITY_HIDDEN __attribute__ ((visibility ("hidden"))) +#else +#define ATTRIBUTE_VISIBILITY_HIDDEN +#endif + +#ifndef BROTLI_INTERNAL +#define BROTLI_INTERNAL ATTRIBUTE_VISIBILITY_HIDDEN +#endif + +#ifndef _MSC_VER +#if defined(__cplusplus) || !defined(__STRICT_ANSI__) || \ + __STDC_VERSION__ >= 199901L +#define BROTLI_INLINE inline ATTRIBUTE_ALWAYS_INLINE +#else +#define BROTLI_INLINE +#endif +#else /* _MSC_VER */ +#define BROTLI_INLINE __forceinline +#endif /* _MSC_VER */ + +#ifdef BROTLI_ENABLE_LOG +#define BROTLI_DCHECK(x) assert(x) +#define BROTLI_LOG(x) printf x +#else +#define BROTLI_DCHECK(x) +#define BROTLI_LOG(x) +#endif + +#if defined(BROTLI_DEBUG) || defined(BROTLI_ENABLE_LOG) +static inline void BrotliDump(const char* f, int l, const char* fn) { + fprintf(stderr, "%s:%d (%s)\n", f, l, fn); + fflush(stderr); +} +#define BROTLI_DUMP() BrotliDump(__FILE__, __LINE__, __FUNCTION__) +#else +#define BROTLI_DUMP() (void)(0) +#endif + +#if defined(BROTLI_BUILD_64_BIT) +#define BROTLI_64_BITS 1 +#elif defined(BROTLI_BUILD_32_BIT) +#define BROTLI_64_BITS 0 +#elif defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8) || \ + defined(BROTLI_TARGET_POWERPC64) +#define BROTLI_64_BITS 1 +#else +#define BROTLI_64_BITS 0 +#endif + +#if defined(BROTLI_BUILD_BIG_ENDIAN) +#define BROTLI_LITTLE_ENDIAN 0 +#define BROTLI_BIG_ENDIAN 1 +#elif defined(BROTLI_BUILD_LITTLE_ENDIAN) +#define BROTLI_LITTLE_ENDIAN 1 +#define BROTLI_BIG_ENDIAN 0 +#elif defined(BROTLI_BUILD_ENDIAN_NEUTRAL) +#define BROTLI_LITTLE_ENDIAN 0 +#define BROTLI_BIG_ENDIAN 0 +#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) +#define BROTLI_LITTLE_ENDIAN 1 +#define BROTLI_BIG_ENDIAN 0 +#elif defined(_WIN32) +/* Win32 can currently always be assumed to be little endian */ +#define BROTLI_LITTLE_ENDIAN 1 +#define BROTLI_BIG_ENDIAN 0 +#else +#if (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)) +#define BROTLI_BIG_ENDIAN 1 +#else +#define BROTLI_BIG_ENDIAN 0 +#endif +#define BROTLI_LITTLE_ENDIAN 0 +#endif + +#if BROTLI_MODERN_COMPILER || __has_attribute(noinline) +#define BROTLI_NOINLINE __attribute__((noinline)) +#else +#define BROTLI_NOINLINE +#endif + +#define BROTLI_REPEAT(N, X) { \ + if ((N & 1) != 0) {X;} \ + if ((N & 2) != 0) {X; X;} \ + if ((N & 4) != 0) {X; X; X; X;} \ +} + +#if BROTLI_MODERN_COMPILER || defined(__llvm__) +#if defined(BROTLI_TARGET_ARMV7) +static BROTLI_INLINE unsigned BrotliRBit(unsigned input) { + unsigned output; + __asm__("rbit %0, %1\n" : "=r"(output) : "r"(input)); + return output; +} +#define BROTLI_RBIT(x) BrotliRBit(x) +#endif /* armv7 */ +#endif /* gcc || clang */ + +#if defined(BROTLI_TARGET_ARM) +#define BROTLI_HAS_UBFX (!!1) +#else +#define BROTLI_HAS_UBFX (!!0) +#endif + +#define BROTLI_ALLOC(S, L) S->alloc_func(S->memory_manager_opaque, L) + +#define BROTLI_FREE(S, X) { \ + S->free_func(S->memory_manager_opaque, X); \ + X = NULL; \ +} + +#define BROTLI_UNUSED(X) (void)(X) + +#endif /* BROTLI_DEC_PORT_H_ */ |