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Check whether compiler supports SHA-NI intrinsics

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SHA intrinsics are available in Clang >=3.8, GCC >=5, and MSVC >=14,
so if supported compiler is used, COMPILER_SUPPORTS_SHA_NI macro
becomes defined
This commit is contained in:
Pavel I. Kryukov 2018-02-11 13:27:39 +03:00 committed by Simon Tatham
parent b2b8f6c3d4
commit 5a38b293bd
1 changed files with 31 additions and 0 deletions
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31
ssh.h
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@ -502,6 +502,37 @@ extern int ssh_fallback_cmd(void *handle);
void SHATransform(word32 * digest, word32 * data); void SHATransform(word32 * digest, word32 * data);
#endif #endif
/*
* Check of compiler version
*/
#ifdef _FORCE_SHA_NI
# define COMPILER_SUPPORTS_SHA_NI
#elif defined(__clang__)
# if (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 8)) && (defined(__x86_64__) || defined(__i386))
# define COMPILER_SUPPORTS_SHA_NI
# endif
#elif defined(__GNUC__)
# if ((__GNUC__ >= 5) && (defined(__x86_64__) || defined(__i386)))
# define COMPILER_SUPPORTS_SHA_NI
# endif
#elif defined (_MSC_VER)
# if (defined(_M_X64) || defined(_M_IX86)) && _MSC_VER >= 1900
# define COMPILER_SUPPORTS_SHA_NI
# endif
#endif
#ifdef _FORCE_SOFTWARE_SHA
# undef COMPILER_SUPPORTS_SHA_NI
#endif
#if defined(__clang__)
# if !__has_attribute(target)
/* If clang is old enough not to support __attribute__((target(...)))
* as used below, then we can't use this code after all. */
# undef COMPILER_SUPPORTS_SHA_NI
# endif
#endif
int random_byte(void); int random_byte(void);
void random_add_noise(void *noise, int length); void random_add_noise(void *noise, int length);
void random_add_heavynoise(void *noise, int length); void random_add_heavynoise(void *noise, int length);