NAME

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

   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:

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

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