yading@10: /*
yading@10:  * simple math operations
yading@10:  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_ARM_MATHOPS_H
yading@10: #define AVCODEC_ARM_MATHOPS_H
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include "config.h"
yading@10: #include "libavutil/common.h"
yading@10: 
yading@10: #if HAVE_INLINE_ASM
yading@10: 
yading@10: #if HAVE_ARMV6_INLINE
yading@10: #define MULH MULH
yading@10: static inline av_const int MULH(int a, int b)
yading@10: {
yading@10:     int r;
yading@10:     __asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
yading@10:     return r;
yading@10: }
yading@10: 
yading@10: #define FASTDIV FASTDIV
yading@10: static av_always_inline av_const int FASTDIV(int a, int b)
yading@10: {
yading@10:     int r;
yading@10:     __asm__ ("cmp     %2, #2               \n\t"
yading@10:              "ldr     %0, [%3, %2, lsl #2] \n\t"
yading@10:              "ite     le                   \n\t"
yading@10:              "lsrle   %0, %1, #1           \n\t"
yading@10:              "smmulgt %0, %0, %1           \n\t"
yading@10:              : "=&r"(r) : "r"(a), "r"(b), "r"(ff_inverse) : "cc");
yading@10:     return r;
yading@10: }
yading@10: 
yading@10: #else /* HAVE_ARMV6_INLINE */
yading@10: 
yading@10: #define FASTDIV FASTDIV
yading@10: static av_always_inline av_const int FASTDIV(int a, int b)
yading@10: {
yading@10:     int r, t;
yading@10:     __asm__ ("umull %1, %0, %2, %3"
yading@10:              : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
yading@10:     return r;
yading@10: }
yading@10: #endif
yading@10: 
yading@10: #define MLS64(d, a, b) MAC64(d, -(a), b)
yading@10: 
yading@10: #if HAVE_ARMV5TE_INLINE
yading@10: 
yading@10: /* signed 16x16 -> 32 multiply add accumulate */
yading@10: #   define MAC16(rt, ra, rb)                                            \
yading@10:     __asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb));
yading@10: 
yading@10: /* signed 16x16 -> 32 multiply */
yading@10: #   define MUL16 MUL16
yading@10: static inline av_const int MUL16(int ra, int rb)
yading@10: {
yading@10:     int rt;
yading@10:     __asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb));
yading@10:     return rt;
yading@10: }
yading@10: 
yading@10: #endif
yading@10: 
yading@10: #define mid_pred mid_pred
yading@10: static inline av_const int mid_pred(int a, int b, int c)
yading@10: {
yading@10:     int m;
yading@10:     __asm__ (
yading@10:         "mov   %0, %2  \n\t"
yading@10:         "cmp   %1, %2  \n\t"
yading@10:         "itt   gt      \n\t"
yading@10:         "movgt %0, %1  \n\t"
yading@10:         "movgt %1, %2  \n\t"
yading@10:         "cmp   %1, %3  \n\t"
yading@10:         "it    le      \n\t"
yading@10:         "movle %1, %3  \n\t"
yading@10:         "cmp   %0, %1  \n\t"
yading@10:         "it    gt      \n\t"
yading@10:         "movgt %0, %1  \n\t"
yading@10:         : "=&r"(m), "+r"(a)
yading@10:         : "r"(b), "r"(c)
yading@10:         : "cc");
yading@10:     return m;
yading@10: }
yading@10: 
yading@10: #endif /* HAVE_INLINE_ASM */
yading@10: 
yading@10: #endif /* AVCODEC_ARM_MATHOPS_H */