util_parity (3avr)

#include <util/parity.h>

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

#define parity_even_bit(val)

Value:

(__extension__({                                             unsigned char __t;                                       __asm__ (                                                        "mov __tmp_reg__,%0" "\n\t"                              "swap %0" "\n\t"                                         "eor %0,__tmp_reg__" "\n\t"                              "mov __tmp_reg__,%0" "\n\t"                              "lsr %0" "\n\t"                                          "lsr %0" "\n\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.

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