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use builtin bswap when available

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PiperOrigin-RevId: 813849285
This commit is contained in:
Evgenii Kliuchnikov
2025-10-01 11:55:32 -07:00
committed by Copybara-Service
parent a896e79d4f
commit 54481d4ebe
1 changed files with 30 additions and 16 deletions
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46
c/common/platform.h
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@@ -291,6 +291,32 @@ static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
memcpy(p, &v, sizeof v);
}
#if BROTLI_GNUC_HAS_BUILTIN(__builtin_bswap16, 4, 3, 0)
#define BROTLI_BSWAP16(V) ((uint16_t)__builtin_bswap16(V))
#else
#define BROTLI_BSWAP16(V) ((uint16_t)( \
(((V) & 0xFFU) << 8) | \
(((V) >> 8) & 0xFFU)))
#endif
#if BROTLI_GNUC_HAS_BUILTIN(__builtin_bswap32, 4, 3, 0)
#define BROTLI_BSWAP32(V) ((uint32_t)__builtin_bswap32(V))
#else
#define BROTLI_BSWAP32(V) ((uint32_t)( \
(((V) & 0xFFU) << 24) | (((V) & 0xFF00U) << 8) | \
(((V) >> 8) & 0xFF00U) | (((V) >> 24) & 0xFFU)))
#endif
#if BROTLI_GNUC_HAS_BUILTIN(__builtin_bswap64, 4, 3, 0)
#define BROTLI_BSWAP64(V) ((uint64_t)__builtin_bswap64(V))
#else
#define BROTLI_BSWAP64(V) ((uint64_t)( \
(((V) & 0xFFU) << 56) | (((V) & 0xFF00U) << 40) | \
(((V) & 0xFF0000U) << 24) | (((V) & 0xFF000000U) << 8) | \
(((V) >> 8) & 0xFF000000U) | (((V) >> 24) & 0xFF0000U) | \
(((V) >> 40) & 0xFF00U) | (((V) >> 56) & 0xFFU)))
#endif
#if BROTLI_LITTLE_ENDIAN
/* Straight endianness. Just read / write values. */
#define BROTLI_UNALIGNED_LOAD16LE BrotliUnalignedRead16
@@ -298,32 +324,20 @@ static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
#define BROTLI_UNALIGNED_LOAD64LE BrotliUnalignedRead64
#define BROTLI_UNALIGNED_STORE64LE BrotliUnalignedWrite64
#elif BROTLI_BIG_ENDIAN /* BROTLI_LITTLE_ENDIAN */
/* Explain compiler to byte-swap values. */
#define BROTLI_BSWAP16_(V) ((uint16_t)( \
(((V) & 0xFFU) << 8) | \
(((V) >> 8) & 0xFFU)))
static BROTLI_INLINE uint16_t BROTLI_UNALIGNED_LOAD16LE(const void* p) {
uint16_t value = BrotliUnalignedRead16(p);
return BROTLI_BSWAP16_(value);
return BROTLI_BSWAP16(value);
}
#define BROTLI_BSWAP32_(V) ( \
(((V) & 0xFFU) << 24) | (((V) & 0xFF00U) << 8) | \
(((V) >> 8) & 0xFF00U) | (((V) >> 24) & 0xFFU))
static BROTLI_INLINE uint32_t BROTLI_UNALIGNED_LOAD32LE(const void* p) {
uint32_t value = BrotliUnalignedRead32(p);
return BROTLI_BSWAP32_(value);
return BROTLI_BSWAP32(value);
}
#define BROTLI_BSWAP64_(V) ( \
(((V) & 0xFFU) << 56) | (((V) & 0xFF00U) << 40) | \
(((V) & 0xFF0000U) << 24) | (((V) & 0xFF000000U) << 8) | \
(((V) >> 8) & 0xFF000000U) | (((V) >> 24) & 0xFF0000U) | \
(((V) >> 40) & 0xFF00U) | (((V) >> 56) & 0xFFU))
static BROTLI_INLINE uint64_t BROTLI_UNALIGNED_LOAD64LE(const void* p) {
uint64_t value = BrotliUnalignedRead64(p);
return BROTLI_BSWAP64_(value);
return BROTLI_BSWAP64(value);
}
static BROTLI_INLINE void BROTLI_UNALIGNED_STORE64LE(void* p, uint64_t v) {
uint64_t value = BROTLI_BSWAP64_(v);
uint64_t value = BROTLI_BSWAP64(v);
BrotliUnalignedWrite64(p, value);
}
#else /* BROTLI_LITTLE_ENDIAN */