|
- /*
- * simple math operations
- * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
- #ifdef FRAC_BITS
- # define MULL(a, b) \
- ({ int lo, hi;\
- asm("smull %0, %1, %2, %3 \n\t"\
- "mov %0, %0, lsr %4\n\t"\
- "add %1, %0, %1, lsl %5\n\t"\
- : "=&r"(lo), "=&r"(hi)\
- : "r"(b), "r"(a), "i"(FRAC_BITS), "i"(32-FRAC_BITS));\
- hi; })
- #endif
-
- #define MULH(a, b) \
- ({ int lo, hi;\
- asm ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));\
- hi; })
-
- #if defined(HAVE_ARMV5TE)
-
- /* signed 16x16 -> 32 multiply add accumulate */
- # define MAC16(rt, ra, rb) \
- asm ("smlabb %0, %2, %3, %0" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
- /* signed 16x16 -> 32 multiply */
- # define MUL16(ra, rb) \
- ({ int __rt; \
- asm ("smulbb %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb)); \
- __rt; })
-
- #endif
|
