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Use additional system macros to figure out endianness

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Also permit it being overridden by explicitly passing SECP256K1_{BIG,LITTLE}_ENDIAN
This commit is contained in:
Pieter Wuille 2020-08-14 11:49:34 -07:00
parent 979961c506
commit 5e5fb28b4a
1 changed files with 17 additions and 6 deletions
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src/util.h
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@ -176,16 +176,27 @@ static SECP256K1_INLINE void *manual_alloc(void** prealloc_ptr, size_t alloc_siz
# define SECP256K1_GNUC_EXT
#endif
#if defined(__BYTE_ORDER__)
# if defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && !defined(SECP256K1_LITTLE_ENDIAN)
/* If SECP256K1_{LITTLE,BIG}_ENDIAN is not explicitly provided, infer from various other system macros. */
#if !defined(SECP256K1_LITTLE_ENDIAN) && !defined(SECP256K1_BIG_ENDIAN)
/* Inspired by https://github.com/rofl0r/endianness.h/blob/9853923246b065a3b52d2c43835f3819a62c7199/endianness.h#L52L73 */
# if (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || \
defined(_X86_) || defined(__x86_64__) || defined(__i386__) || \
defined(__i486__) || defined(__i586__) || defined(__i686__) || \
defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL) || \
defined(__ARMEL__) || defined(__AARCH64EL__) || \
(defined(__LITTLE_ENDIAN__) && __LITTLE_ENDIAN__ == 1) || \
(defined(_LITTLE_ENDIAN) && _LITTLE_ENDIAN == 1) || \
defined(_M_IX86) || defined(_M_AMD64) || defined(_M_ARM) /* MSVC */
# define SECP256K1_LITTLE_ENDIAN
# elif defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && !defined(SECP256K1_BIG_ENDIAN)
# endif
# if (defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB) || \
defined(__MICROBLAZEEB__) || defined(__ARMEB__) || defined(__AARCH64EB__) || \
(defined(__BIG_ENDIAN__) && __BIG_ENDIAN__ == 1) || \
(defined(_BIG_ENDIAN) && _BIG_ENDIAN == 1)
# define SECP256K1_BIG_ENDIAN
# endif
#endif
#if defined(_MSC_VER) && defined(_WIN32) && !defined(SECP256K1_LITTLE_ENDIAN)
# define SECP256K1_LITTLE_ENDIAN
#endif
#if defined(SECP256K1_LITTLE_ENDIAN) == defined(SECP256K1_BIG_ENDIAN)
# error Please make sure that either SECP256K1_LITTLE_ENDIAN or SECP256K1_BIG_ENDIAN is set, see src/util.h.
#endif