37 lines
709 B
C
37 lines
709 B
C
/* User include file for libfec
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* Copyright 2004, Phil Karn, KA9Q
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* May be used under the terms of the GNU Lesser General Public License (LGPL)
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*/
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#ifdef __x86_64__
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#define __i386__
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#endif
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/* Determine parity of argument: 1 = odd, 0 = even */
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#ifdef __i386__
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static inline int parityb(unsigned char x){
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__asm__ __volatile__ ("test %1,%1;setpo %0" : "=g"(x) : "r" (x));
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return x;
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}
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#else
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void partab_init();
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static inline int parityb(unsigned char x){
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extern unsigned char Partab[256];
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extern int P_init;
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if(!P_init){
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partab_init();
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}
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return Partab[x];
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}
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#endif
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static inline int parity(int x){
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/* Fold down to one byte */
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x ^= (x >> 16);
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x ^= (x >> 8);
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return parityb(x);
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}
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