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util_parity(3avr) avr-libc util_parity(3avr)

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

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Fri Nov 24 2023 23:59:10 Version 2.0.0