ffmpeg / libavcodec / bfin / mathops.h @ 6bb6fb05
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/*


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* simple math operations

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*

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* Copyright (C) 2007 Marc Hoffman <mmhoffm@gmail.com>

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*

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* This file is part of Libav.

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*

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* Libav is free software; you can redistribute it and/or

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* modify it under the terms of the GNU Lesser General Public

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* License as published by the Free Software Foundation; either

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* version 2.1 of the License, or (at your option) any later version.

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*

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* Libav is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* Lesser General Public License for more details.

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*

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* You should have received a copy of the GNU Lesser General Public

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* License along with Libav; if not, write to the Free Software

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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA

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*/

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#ifndef AVCODEC_BFIN_MATHOPS_H

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#define AVCODEC_BFIN_MATHOPS_H

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#include "config.h" 
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#define MULH(X,Y) ({ int xxo; \ 
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__asm__ ( \ 
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"a1 = %2.L * %1.L (FU);\n\t" \

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"a1 = a1 >> 16;\n\t" \

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"a1 += %2.H * %1.L (IS,M);\n\t" \

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"a0 = %1.H * %2.H, a1+= %1.H * %2.L (IS,M);\n\t"\

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"a1 = a1 >>> 16;\n\t" \

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"%0 = (a0 += a1);\n\t" \

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: "=d" (xxo) : "d" (X), "d" (Y) : "A0","A1"); xxo; }) 
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/* signed 16x16 > 32 multiply */

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#define MUL16(a, b) ({ int xxo; \ 
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__asm__ ( \ 
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"%0 = %1.l*%2.l (is);\n\t" \

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: "=W" (xxo) : "d" (a), "d" (b) : "A1"); \ 
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xxo; }) 
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#endif /* AVCODEC_BFIN_MATHOPS_H */ 