On Fri, 7 Dec 2007, Ross Ridge wrote: > Boris Boesler writes: > > Ok, so what have I to do to write a back-end where all addresses are > > given in bits? Memory is addressed in bits, not bytes. So I set: > > > > #define BITS_PER_UNIT 1 > > #define UNITS_PER_WORD 32 > > I don't know if it's useful to define the size of a byte to be less than > 8-bits, even if that more accurately reflects the hardware. Standard C > requires that the char type both be at least 8 bits (UCHAR_MAX >= 256) > and the same size as a byte (sizeof(char) == 1). You can't define any > types that are smaller than a char and have sizeof work correctly.
In theory GCC supports CHAR_TYPE_SIZE > BITS_PER_UNIT, so sizeof(char) is still 1 (sizeof counts in units of CHAR_TYPE_SIZE not BITS_PER_UNIT) but a char is not the hardware addressing unit. I expect this is even more broken in practice than BITS_PER_UNIT > 8. -- Joseph S. Myers [EMAIL PROTECTED]
