mirror of
https://github.com/google/brotli.git
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169 lines
4.9 KiB
C
169 lines
4.9 KiB
C
/* Copyright 2015 Google Inc. All Rights Reserved.
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Distributed under MIT license.
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See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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*/
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/* Macros for compiler / platform specific features and build options.
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Build options are:
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* BROTLI_BUILD_32_BIT disables 64-bit optimizations
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* BROTLI_BUILD_64_BIT forces to use 64-bit optimizations
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* BROTLI_BUILD_BIG_ENDIAN forces to use big-endian optimizations
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* BROTLI_BUILD_ENDIAN_NEUTRAL disables endian-aware optimizations
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* BROTLI_BUILD_LITTLE_ENDIAN forces to use little-endian optimizations
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* BROTLI_BUILD_MODERN_COMPILER forces to use modern compilers built-ins,
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features and attributes
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* BROTLI_BUILD_PORTABLE disables dangerous optimizations, like unaligned
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read and overlapping memcpy; this reduces decompression speed by 5%
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* BROTLI_BUILD_NO_RBIT disables "rbit" optimization for ARM CPUs
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* BROTLI_DEBUG dumps file name and line number when decoder detects stream
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or memory error
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* BROTLI_ENABLE_LOG enables asserts and dumps various state information
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*/
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#ifndef BROTLI_DEC_PORT_H_
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#define BROTLI_DEC_PORT_H_
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#if defined(BROTLI_ENABLE_LOG) || defined(BROTLI_DEBUG)
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#include <assert.h>
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#include <stdio.h>
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#endif
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#include <brotli/port.h>
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#if defined(__arm__) || defined(__thumb__) || \
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defined(_M_ARM) || defined(_M_ARMT) || defined(__ARM64_ARCH_8__)
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#define BROTLI_TARGET_ARM
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#if (defined(__ARM_ARCH) && (__ARM_ARCH == 7)) || \
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(defined(M_ARM) && (M_ARM == 7))
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#define BROTLI_TARGET_ARMV7
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#endif /* ARMv7 */
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#if defined(__aarch64__) || defined(__ARM64_ARCH_8__)
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#define BROTLI_TARGET_ARMV8
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#endif /* ARMv8 */
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#endif /* ARM */
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#if defined(__i386) || defined(_M_IX86)
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#define BROTLI_TARGET_X86
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#endif
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#if defined(__x86_64__) || defined(_M_X64)
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#define BROTLI_TARGET_X64
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#endif
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#if defined(__PPC64__)
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#define BROTLI_TARGET_POWERPC64
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#endif
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#ifdef BROTLI_BUILD_PORTABLE
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#define BROTLI_ALIGNED_READ (!!1)
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#elif defined(BROTLI_TARGET_X86) || defined(BROTLI_TARGET_X64) || \
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defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8)
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/* Allow unaligned read only for white-listed CPUs. */
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#define BROTLI_ALIGNED_READ (!!0)
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#else
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#define BROTLI_ALIGNED_READ (!!1)
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#endif
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/* IS_CONSTANT macros returns true for compile-time constant expressions. */
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#if BROTLI_MODERN_COMPILER || __has_builtin(__builtin_constant_p)
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#define IS_CONSTANT(x) (!!__builtin_constant_p(x))
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#else
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#define IS_CONSTANT(x) (!!0)
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#endif
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#ifdef BROTLI_ENABLE_LOG
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#define BROTLI_DCHECK(x) assert(x)
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#define BROTLI_LOG(x) printf x
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#else
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#define BROTLI_DCHECK(x)
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#define BROTLI_LOG(x)
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#endif
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#if defined(BROTLI_DEBUG) || defined(BROTLI_ENABLE_LOG)
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static BROTLI_INLINE void BrotliDump(const char* f, int l, const char* fn) {
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fprintf(stderr, "%s:%d (%s)\n", f, l, fn);
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fflush(stderr);
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}
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#define BROTLI_DUMP() BrotliDump(__FILE__, __LINE__, __FUNCTION__)
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#else
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#define BROTLI_DUMP() (void)(0)
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#endif
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#if defined(BROTLI_BUILD_64_BIT)
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#define BROTLI_64_BITS 1
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#elif defined(BROTLI_BUILD_32_BIT)
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#define BROTLI_64_BITS 0
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#elif defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8) || \
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defined(BROTLI_TARGET_POWERPC64)
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#define BROTLI_64_BITS 1
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#else
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#define BROTLI_64_BITS 0
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#endif
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#if (BROTLI_64_BITS)
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#define reg_t uint64_t
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#else
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#define reg_t uint32_t
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#endif
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#if defined(BROTLI_BUILD_BIG_ENDIAN)
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#define BROTLI_LITTLE_ENDIAN 0
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#define BROTLI_BIG_ENDIAN 1
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#elif defined(BROTLI_BUILD_LITTLE_ENDIAN)
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#define BROTLI_LITTLE_ENDIAN 1
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#define BROTLI_BIG_ENDIAN 0
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#elif defined(BROTLI_BUILD_ENDIAN_NEUTRAL)
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#define BROTLI_LITTLE_ENDIAN 0
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#define BROTLI_BIG_ENDIAN 0
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#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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#define BROTLI_LITTLE_ENDIAN 1
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#define BROTLI_BIG_ENDIAN 0
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#elif defined(_WIN32)
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/* Win32 can currently always be assumed to be little endian */
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#define BROTLI_LITTLE_ENDIAN 1
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#define BROTLI_BIG_ENDIAN 0
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#else
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#if (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
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#define BROTLI_BIG_ENDIAN 1
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#else
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#define BROTLI_BIG_ENDIAN 0
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#endif
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#define BROTLI_LITTLE_ENDIAN 0
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#endif
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#define BROTLI_REPEAT(N, X) { \
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if ((N & 1) != 0) {X;} \
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if ((N & 2) != 0) {X; X;} \
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if ((N & 4) != 0) {X; X; X; X;} \
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}
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#if (BROTLI_MODERN_COMPILER || defined(__llvm__)) && \
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!defined(BROTLI_BUILD_NO_RBIT)
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#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8)
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/* TODO: detect ARMv6T2 and enable this code for it. */
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static BROTLI_INLINE reg_t BrotliRBit(reg_t input) {
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reg_t output;
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__asm__("rbit %0, %1\n" : "=r"(output) : "r"(input));
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return output;
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}
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#define BROTLI_RBIT(x) BrotliRBit(x)
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#endif /* armv7 */
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#endif /* gcc || clang */
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#if defined(BROTLI_TARGET_ARM)
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#define BROTLI_HAS_UBFX (!!1)
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#else
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#define BROTLI_HAS_UBFX (!!0)
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#endif
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#define BROTLI_ALLOC(S, L) S->alloc_func(S->memory_manager_opaque, L)
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#define BROTLI_FREE(S, X) { \
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S->free_func(S->memory_manager_opaque, X); \
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X = NULL; \
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}
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#endif /* BROTLI_DEC_PORT_H_ */
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