DrSocalkwe3n/luajit
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Use common helper functions for unaligned loads.

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This commit is contained in:
Mike Pall
2011-05-09 18:09:29 +02:00
parent d9c1f771a7
commit 28e87d33e9
3 changed files with 34 additions and 23 deletions
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26
src/lj_def.h
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@@ -184,6 +184,28 @@ static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
#error "missing define for lj_bswap()"
#endif
typedef union __attribute__((packed)) Unaligned16 {
uint16_t u;
uint8_t b[2];
} Unaligned16;
typedef union __attribute__((packed)) Unaligned32 {
uint32_t u;
uint8_t b[4];
} Unaligned32;
/* Unaligned load of uint16_t. */
static LJ_AINLINE uint16_t lj_getu16(const void *p)
{
return ((const Unaligned16 *)p)->u;
}
/* Unaligned load of uint32_t. */
static LJ_AINLINE uint32_t lj_getu32(const void *p)
{
return ((const Unaligned32 *)p)->u;
}
#elif defined(_MSC_VER)
#define LJ_NORET __declspec(noreturn)
@@ -208,6 +230,10 @@ static LJ_AINLINE uint32_t lj_fls(uint32_t x)
#define lj_bswap(x) (_byteswap_ulong((x)))
#define lj_bswap64(x) (_byteswap_uint64((x)))
/* MSVC is only supported on x86/x64, where unaligned loads are always ok. */
#define lj_getu16(p) (*(uint16_t *)(p))
#define lj_getu32(p) (*(uint32_t *)(p))
#else
#error "missing defines for your compiler"
#endif