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48 lines
1.6 KiB
48 lines
1.6 KiB
18 years ago
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/*
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* simple math operations
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifdef FRAC_BITS
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# define MULL(a, b) \
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({ int lo, hi;\
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asm("smull %0, %1, %2, %3 \n\t"\
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"mov %0, %0, lsr %4\n\t"\
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"add %1, %0, %1, lsl %5\n\t"\
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: "=&r"(lo), "=&r"(hi)\
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: "r"(b), "r"(a), "i"(FRAC_BITS), "i"(32-FRAC_BITS));\
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hi; })
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#endif
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#define MULH(a, b) \
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({ int lo, hi;\
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asm ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));\
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hi; })
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#if defined(HAVE_ARMV5TE)
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/* signed 16x16 -> 32 multiply add accumulate */
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# define MAC16(rt, ra, rb) \
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asm ("smlabb %0, %2, %3, %0" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
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/* signed 16x16 -> 32 multiply */
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# define MUL16(ra, rb) \
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({ int __rt;\
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asm ("smulbb %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb));
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__rt; })
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#endif
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