.TH "util_parity" 3avr "Fri Jan 1 2021" "Version 2.0.0" "avr-libc" \" -*- nroff -*-
.ad l
.nh
.SH NAME
util_parity \- <util/parity\&.h>: Parity bit generation
.SH SYNOPSIS
.br
.PP
.SS "Macros"

.in +1c
.ti -1c
.RI "#define \fBparity_even_bit\fP(val)"
.br
.in -1c
.SH "Detailed Description"
.PP 

.PP
.nf
#include <util/parity\&.h> 

.fi
.PP
.PP
This header file contains optimized assembler code to calculate the parity bit for a byte\&. 
.SH "Macro Definition Documentation"
.PP 
.SS "#define parity_even_bit(val)"
\fBValue:\fP
.PP
.nf
(__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);             \
 }))
.fi

.PP
\fBReturns\fP
.RS 4
1 if \fCval\fP has an odd number of bits set\&. 
.RE
.PP

.SH "Author"
.PP 
Generated automatically by Doxygen for avr-libc from the source code\&.