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Compute parity without using assembler

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ismagom 2014-06-09 18:59:57 +01:00
parent c3504cb385
commit c56d099afd
1 changed files with 29 additions and 0 deletions
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lte/lib/fec/src/parity.c Normal file
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/*
* Copyright 2004, Phil Karn, KA9Q
* May be used under the terms of the GNU Lesser General Public License (LGPL)
*/
#include <stdio.h>
unsigned char Partab[256];
int P_init;
/* Create 256-entry odd-parity lookup table
* Needed only on non-ia32 machines
*/
void partab_init(void) {
int i, cnt, ti;
/* Initialize parity lookup table */
for (i = 0; i < 256; i++) {
cnt = 0;
ti = i;
while (ti) {
if (ti & 1)
cnt++;
ti >>= 1;
}
Partab[i] = cnt & 1;
}
P_init = 1;
}