oracular (3) util_parity.3avr.gz

Provided by: avr-libc_2.0.0+Atmel3.7.0-1_all bug

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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