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70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
// Copyright (c) 2000-2011 by Digital Mars
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// All Rights Reserved
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// written by Walter Bright
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// http://www.digitalmars.com
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// License for redistribution is by either the Artistic License
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// in artistic.txt, or the GNU General Public License in gnu.txt.
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// See the included readme.txt for details.
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// Bit operations for GCC and I386
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#ifndef GCCBITOPS_H
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#define GCCBITOPS_H 1
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inline int _inline_bsf(int w)
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{ int index;
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__asm__ __volatile__
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(
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"bsfl %1, %0 \n\t"
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: "=r" (index)
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: "r" (w)
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);
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return index;
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}
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inline int _inline_bt(unsigned *p, int i)
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{
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char result;
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__asm__ __volatile__
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(
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"btl %2,%1 \n\t"
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"setc %0 \n\t"
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:"=r" (result)
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:"m" (*p), "r" (i)
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);
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return result;
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}
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inline int _inline_bts(unsigned *p, int i)
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{
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char result;
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__asm__ __volatile__
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(
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"btsl %2,%1 \n\t"
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"setc %0 \n\t"
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:"=r" (result)
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:"m" (*p), "r" (i)
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);
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return result;
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}
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inline int _inline_btr(unsigned *p, int i)
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{
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char result;
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__asm__ __volatile__
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(
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"btrl %2,%1 \n\t"
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"setc %0 \n\t"
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:"=r" (result)
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:"m" (*p), "r" (i)
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);
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return result;
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}
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#endif
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