NAME

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

SYNOPSIS

   Macros
       #define parity_even_bit(val)

Detailed Description

       #include <util/parity.h>

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

Macro Definition Documentation

   #define parity_even_bit(val)
       Value:.PP
       (__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.

Author

       Generated automatically by Doxygen for avr-libc from the source code.