Alchemy AU1550 board: establish endianness

"Roman Mashak" wrote in news:cimifa$2cik$ snipped-for-privacy@mpeks.tomsk.su:

one generic way (assuming sizeof(int)>sizeof(char)):

int i=1; if (*(char *)&i) /* little endian */;

BOO. Beware of optimizer. :-)

-- Michael N. Moran (h) 770 516 7918

"... abstractions save us time working, but they don't save us time learning." Joel Spolsky, The Law of Leaky Abstractions

The Beatles were wrong: 1 & 1 & 1 is 1

Followup to: By author: snipped-for-privacy@mnmoran.org In newsgroup: comp.arch.embedded

If the optimizer optimizes that out, then the optimizer is broken. However, try:

static volatile uint16_t i = 0x0102; volatile uint8_t *p = (volatile uint8_t *)&i;

switch ( *p ) { case 1: /* bigendian */ break; case 2: /* littleendian */ break; default: /* wtf */ break; }

If the optimizer optimizes *THAT* out then napalm your compiler vendor.

-hpa