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Add bswap_128()

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This greatly helps for IPv6 endianess convertion
This commit is contained in:
Hugues Morisset 2025-08-10 17:08:05 +02:00
parent f1e83d5240
commit f466d757ec
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3 changed files with 58 additions and 39 deletions
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5
libc/intrin/bswap.c
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@ -45,3 +45,8 @@ uint64_t(bswap_64)(uint64_t x) {
(0x00ff000000000000ull & x) >> 050 |
(0xff00000000000000ull & x) >> 070;
}
uint128_t(bswap_128)(uint128_t x) {
return ((uint128_t)bswap_64((uint64_t)x) << 64) |
(uint128_t)bswap_64((uint64_t)(x >> 64));
}

2
libc/intrin/bswap.h
View file

@ -5,11 +5,13 @@ COSMOPOLITAN_C_START_
libcesque uint16_t bswap_16(uint16_t) pureconst;
libcesque uint32_t bswap_32(uint32_t) pureconst;
libcesque uint64_t bswap_64(uint64_t) pureconst;
libcesque uint128_t bswap_128(uint128_t) pureconst;
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
#define bswap_16(x) __builtin_bswap16(x)
#define bswap_32(x) __builtin_bswap32(x)
#define bswap_64(x) __builtin_bswap64(x)
#define bswap_128(x) __builtin_bswap128(x)
#endif /* defined(__GNUC__) && !defined(__STRICT_ANSI__) */
COSMOPOLITAN_C_END_

12
libc/intrin/newbie.h
View file

@ -17,6 +17,9 @@
#define htobe64(x) bswap_64(x)
#define be64toh(x) bswap_64(x)
#define betoh64(x) bswap_64(x)
#define htobe128(x) bswap_128(x)
#define be128toh(x) bswap_128(x)
#define betoh128(x) bswap_128(x)
#define htole16(x) (uint16_t)(x)
#define le16toh(x) (uint16_t)(x)
#define letoh16(x) (uint16_t)(x)
@ -26,6 +29,9 @@
#define htole64(x) (uint64_t)(x)
#define le64toh(x) (uint64_t)(x)
#define letoh64(x) (uint64_t)(x)
#define htole128(x) (uint128_t)(x)
#define le128toh(x) (uint128_t)(x)
#define letoh128(x) (uint128_t)(x)
#else
#define htobe16(x) (uint16_t)(x)
#define be16toh(x) (uint16_t)(x)
@ -36,6 +42,9 @@
#define htobe64(x) (uint64_t)(x)
#define be64toh(x) (uint64_t)(x)
#define betoh64(x) (uint64_t)(x)
#define htobe128(x) (uint128_t)(x)
#define be128toh(x) (uint128_t)(x)
#define betoh128(x) (uint128_t)(x)
#define htole16(x) bswap_16(x)
#define le16toh(x) bswap_16(x)
#define letoh16(x) bswap_16(x)
@ -45,6 +54,9 @@
#define htole64(x) bswap_64(x)
#define le64toh(x) bswap_64(x)
#define letoh64(x) bswap_64(x)
#define htole128(x) bswap_128(x)
#define le128toh(x) bswap_128(x)
#define letoh128(x) bswap_128(x)
#endif
#endif /* COSMOPOLITAN_LIBC_BITS_NEWBIE_H_ */