<util/parity.h>: Parity bit generation(3)

NAME
<util/parity.h>: Parity bit generation -

Detailed Description

 #include <util/parity.h>

This header file contains optimized assembler code to calculate the parity bit for a byte.

  Defines
#define parity_even_bit(val)

Define Documentation

  #define parity_even_bit(val)

Value:

(__extension__({                                                unsigned char __t;                                      __asm__ (                                                       'mov __tmp_reg__,%0' 't'                             'swap %0' 't'                                        'eor %0,__tmp_reg__' 't'                             'mov __tmp_reg__,%0' 't'                             'lsr %0' 't'                                         'lsr %0' 't'                                         'eor %0,__tmp_reg__'                                    : '=r' (__t)                                            : '0' ((unsigned char)(val))                            : 'r0'                                          );                                                      (((__t + 1) >> 1) & 1);                          }))
Returns:
    1 if val has an odd number of bits set.