mirror of
https://github.com/cuberite/libdeflate.git
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117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/*
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* compiler_gcc.h - definitions for the GNU C Compiler. Currently this also
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* handles clang and the Intel C Compiler.
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*/
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#define GCC_PREREQ(major, minor) \
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(!defined(__clang__) && !defined(__INTEL_COMPILER) && \
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(__GNUC__ > (major) || \
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(__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))))
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#ifndef __has_attribute
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# define __has_attribute(attribute) 0
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#endif
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#ifndef __has_feature
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# define __has_feature(feature) 0
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#endif
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#ifndef __has_builtin
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# define __has_builtin(builtin) 0
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#endif
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#ifdef _WIN32
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# define LIBEXPORT __declspec(dllexport)
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#else
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# define LIBEXPORT __attribute__((visibility("default")))
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#endif
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#define inline inline
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#define forceinline inline __attribute__((always_inline))
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#define restrict __restrict__
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#define likely(expr) __builtin_expect(!!(expr), 1)
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#define unlikely(expr) __builtin_expect(!!(expr), 0)
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#define prefetchr(addr) __builtin_prefetch((addr), 0)
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#define prefetchw(addr) __builtin_prefetch((addr), 1)
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#define _aligned_attribute(n) __attribute__((aligned(n)))
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#define COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE \
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(GCC_PREREQ(4, 4) || __has_attribute(target))
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/*
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* Support for the following instruction set extensions was introduced by the
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* following gcc versions:
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*
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* PCLMUL 4.4
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* AVX 4.6
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* BMI2 4.7
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* AVX2 4.7
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*
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* However, target-specific intrinsics don't work in __attribute__((target(..)))
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* functions until gcc 4.9. Currently we need this for PCLMUL and AVX2 but not
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* AVX and BMI2. Hence the particular version checks below.
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*
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* Note: clang does not have this problem and also supports __has_builtin() for
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* testing for whether an intrinsic is available without having to check the
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* compiler version.
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*/
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#define COMPILER_SUPPORTS_PCLMUL_TARGET \
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(COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE && \
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(GCC_PREREQ(4, 9) || __has_builtin(__builtin_ia32_pclmulqdq128)))
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#define COMPILER_SUPPORTS_AVX_TARGET \
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(COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE && \
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(GCC_PREREQ(4, 6) || __has_builtin(__builtin_ia32_maxps256)))
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#define COMPILER_SUPPORTS_BMI2_TARGET \
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(COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE && \
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(GCC_PREREQ(4, 7) || __has_builtin(__builtin_ia32_pdep_di)))
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#define COMPILER_SUPPORTS_AVX2_TARGET \
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(COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE && \
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(GCC_PREREQ(4, 9) || __has_builtin(__builtin_ia32_pmaddwd256)))
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/* Newer gcc supports __BYTE_ORDER__. Older gcc doesn't. */
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#ifdef __BYTE_ORDER__
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# define CPU_IS_LITTLE_ENDIAN() (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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#endif
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#if GCC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16)
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# define bswap16 __builtin_bswap16
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#endif
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#if GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap32)
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# define bswap32 __builtin_bswap32
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#endif
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#if GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap64)
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# define bswap64 __builtin_bswap64
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#endif
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#if defined(__x86_64__) || defined(__i386__) || defined(__ARM_FEATURE_UNALIGNED)
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# define UNALIGNED_ACCESS_IS_FAST 1
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#endif
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/* With gcc, we can access unaligned memory through 'packed' structures. */
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#define DEFINE_UNALIGNED_TYPE(type) \
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\
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struct type##unaligned { \
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type v; \
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} __attribute__((packed)); \
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\
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static forceinline type \
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load_##type##_unaligned(const void *p) \
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{ \
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return ((const struct type##unaligned *)p)->v; \
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} \
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\
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static forceinline void \
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store_##type##_unaligned(type v, void *p) \
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{ \
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((struct type##unaligned *)p)->v = v; \
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}
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#define bsr32(n) (31 - __builtin_clz(n))
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#define bsr64(n) (63 - __builtin_clzll(n))
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#define bsf32(n) __builtin_ctz(n)
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#define bsf64(n) __builtin_ctzll(n)
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