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bytesex: more endianness detection hacks

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A few more tricks for sussing out endinanness, and add an ultimate
fallback option.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin
2017-04-25 12:51:17 -07:00
parent 573112ee86
commit 53cd7c7bf0
2 changed files with 54 additions and 11 deletions
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38
include/bytesex.h
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@@ -223,8 +223,42 @@ static inline uint64_t cpu_to_le64(uint64_t v)
#else /* not WORDS_LITTLEENDIAN or WORDS_BIGENDIAN */
#error "Update byteord.h to include arbitrary byte orders"
static inline uint16_t cpu_to_le16(uint16_t v)
{
union u16 {
uint16_t v;
uint8_t c[2];
} x;
uint8_t *cp = &x.c;
WRITESHORT(cp, v);
return x.v;
}
static inline uint32_t cpu_to_le32(uint32_t v)
{
union u32 {
uint32_t v;
uint8_t c[4];
} x;
uint8_t *cp = &x.c;
WRITELONG(cp, v);
return x.v;
}
static inline uint64_t cpu_to_le64(uint64_t v)
{
union u64 {
uint64_t v;
uint8_t c[8];
} x;
uint8_t *cp = &x.c;
WRITEDLONG(cp, v);
return x.v;
}
#endif
#endif /* NASM_BYTEORD_H */
#endif /* NASM_BYTESEX_H */