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Only use __attribute__(target("bmi2")) on supported compiler versions

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This commit is contained in:
Eric Biggers 2016-01-30 22:20:09 -06:00
parent 21205d0447
commit 4ad7bbe2df
3 changed files with 27 additions and 5 deletions
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26
src/compiler-gcc.h
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@ -1,7 +1,18 @@
/*
* compiler-gcc.h - definitions for the GNU C compiler (and for clang)
* compiler-gcc.h - definitions for the GNU C Compiler. Currently this also
* handles clang and the Intel C Compiler.
*/
#define GCC_PREREQ(major, minor) \
(!defined(__clang__) && !defined(__INTEL_COMPILER) && \
(__GNUC__ > major || \
(__GNUC__ == major && __GNUC_MINOR__ >= minor)))
#define CLANG_PREREQ(major, minor) \
(defined(__clang__) && \
(__clang_major__ > major || \
(__clang_major__ == major && __clang_minor__ >= minor)))
#ifdef _WIN32
# define LIBEXPORT __declspec(dllexport)
#else
@ -42,11 +53,11 @@ store_##type##_unaligned(type v, void *p) \
# define UNALIGNED_ACCESS_IS_FAST 1
#endif
#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
#if GCC_PREREQ(4, 8)
# define compiler_bswap16 __builtin_bswap16
#endif
#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
#if GCC_PREREQ(4, 3)
# define compiler_bswap32 __builtin_bswap32
# define compiler_bswap64 __builtin_bswap64
#endif
@ -55,3 +66,12 @@ store_##type##_unaligned(type v, void *p) \
#define compiler_fls64(n) (63 - __builtin_clzll(n))
#define compiler_ffs32(n) __builtin_ctz(n)
#define compiler_ffs64(n) __builtin_ctzll(n)
/* Does the compiler support the 'target' function attribute? */
#define COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE \
(CLANG_PREREQ(3, 7) || GCC_PREREQ(4, 4))
/* Does the compiler support __attribute__((target("bmi2")))? */
#define COMPILER_SUPPORTS_BMI2_TARGET \
(COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE && \
(CLANG_PREREQ(3, 7) || GCC_PREREQ(4, 7)))

3
src/deflate_decompress.c
View File

@ -783,7 +783,8 @@ copy_word_unaligned(const void *src, void *dst)
#undef FUNCNAME
#undef ATTRIBUTES
#if X86_CPU_FEATURES_ENABLED && !defined(__BMI2__)
#if X86_CPU_FEATURES_ENABLED && \
COMPILER_SUPPORTS_BMI2_TARGET && !defined(__BMI2__)
# define FUNCNAME deflate_decompress_bmi2
# define ATTRIBUTES __attribute__((target("bmi2")))
# include "decompress_impl.h"

3
src/x86_cpu_features.h
View File

@ -10,7 +10,8 @@
# define RUNTIME_CPU_DETECTION 1
#endif
#if RUNTIME_CPU_DETECTION && defined(__GNUC__) && defined(__x86_64__)
#if RUNTIME_CPU_DETECTION && defined(__x86_64__) && \
COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE
# define X86_CPU_FEATURES_ENABLED 1
#endif