.TH "<util/parity.h>: Parity bit generation" 3 "24 Jun 2019" "Version 2.0.0" "avr-libc" \" -*- nroff -*-
.ad l
.nh
.SH NAME
<util/parity.h>: Parity bit generation \- 
.SS "Defines"

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

.SH "Author"
.PP 
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