El 18/10/2013 18:29, Ion Gaztañaga wrote:
> Maybe we can require CHAR_BIT to be power of two but not exactly 8 bits.

Correction: Freescale's 24 bit DSPs for signal processing (I also can
see references for 28/56 bit DSPs from Analog) has CHAR_BIT == 24.

application-notes.digchip.com/314/314-68461.pdf‎

"3.4 Data Types and Sizes

Due to the word orientation ofthe DSP56300 family (24-bit words), all
data types are aligned on word boundaries. This has several side
effects,one of which is that sizeof(char) is equal to sizeof(int)."

"Data Type / Size (words) / Min value / Max value

char / 1 / -8388608 / 8388607
unsigned char / 1 / 0 / 0xFFFFFF
short / 1 / -8388608 / 8388607
unsigned short / 1 / 0 / 0xFFFFFF
int / 1 / -8388608 / 8388607
unsigned int / 1 / 0 / 0xFFFFFF
long / 2 / -140737488355328 / 140737488355327
unsigned long / 2 / 0 / 0xFFFFFFFFFFFF"

Best,

Ion