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)

(__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.

Author

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