mirror of https://github.com/PentHertz/srsLTE.git
37 lines
683 B
C
37 lines
683 B
C
/*
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* Copyright 2004, Phil Karn, KA9Q
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* May be used under the terms of the GNU Affero 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 uint32_t parityb(uint8_t x){
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__asm__ __volatile__ ("test %1,%1;setpo %0" : "=q" (x) : "q" (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 uint32_t parityb(uint8_t x){
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extern uint8_t Partab[256];
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extern uint32_t 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 uint32_t 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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