nengel@2: /*
nengel@2:  * simple math operations
nengel@2:  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
nengel@2:  *
nengel@2:  * This file is part of FFmpeg.
nengel@2:  *
nengel@2:  * FFmpeg is free software; you can redistribute it and/or
nengel@2:  * modify it under the terms of the GNU Lesser General Public
nengel@2:  * License as published by the Free Software Foundation; either
nengel@2:  * version 2.1 of the License, or (at your option) any later version.
nengel@2:  *
nengel@2:  * FFmpeg is distributed in the hope that it will be useful,
nengel@2:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nengel@2:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
nengel@2:  * Lesser General Public License for more details.
nengel@2:  *
nengel@2:  * You should have received a copy of the GNU Lesser General Public
nengel@2:  * License along with FFmpeg; if not, write to the Free Software
nengel@2:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
nengel@2:  */
nengel@2: 
nengel@2: #ifndef AVCODEC_ARM_MATHOPS_H
nengel@2: #define AVCODEC_ARM_MATHOPS_H
nengel@2: 
nengel@2: #include <stdint.h>
nengel@2: #include "config.h"
nengel@2: #include "libavutil/common.h"
nengel@2: 
nengel@2: #if HAVE_INLINE_ASM
nengel@2: 
nengel@2: #   define MULL MULL
nengel@2: static inline av_const int MULL(int a, int b, unsigned shift)
nengel@2: {
nengel@2:     int lo, hi;
nengel@2:     __asm__("smull %0, %1, %2, %3     \n\t"
nengel@2:             "mov   %0, %0,     lsr %4 \n\t"
nengel@2:             "add   %1, %0, %1, lsl %5 \n\t"
nengel@2:             : "=&r"(lo), "=&r"(hi)
nengel@2:             : "r"(b), "r"(a), "ir"(shift), "ir"(32-shift));
nengel@2:     return hi;
nengel@2: }
nengel@2: 
nengel@2: #define MULH MULH
nengel@2: #if HAVE_ARMV6
nengel@2: static inline av_const int MULH(int a, int b)
nengel@2: {
nengel@2:     int r;
nengel@2:     __asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
nengel@2:     return r;
nengel@2: }
nengel@2: #else
nengel@2: static inline av_const int MULH(int a, int b)
nengel@2: {
nengel@2:     int lo, hi;
nengel@2:     __asm__ ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));
nengel@2:     return hi;
nengel@2: }
nengel@2: #endif
nengel@2: 
nengel@2: static inline av_const int64_t MUL64(int a, int b)
nengel@2: {
nengel@2:     union { uint64_t x; unsigned hl[2]; } x;
nengel@2:     __asm__ ("smull %0, %1, %2, %3"
nengel@2:              : "=r"(x.hl[0]), "=r"(x.hl[1]) : "r"(a), "r"(b));
nengel@2:     return x.x;
nengel@2: }
nengel@2: #define MUL64 MUL64
nengel@2: 
nengel@2: static inline av_const int64_t MAC64(int64_t d, int a, int b)
nengel@2: {
nengel@2:     union { uint64_t x; unsigned hl[2]; } x = { d };
nengel@2:     __asm__ ("smlal %0, %1, %2, %3"
nengel@2:              : "+r"(x.hl[0]), "+r"(x.hl[1]) : "r"(a), "r"(b));
nengel@2:     return x.x;
nengel@2: }
nengel@2: #define MAC64(d, a, b) ((d) = MAC64(d, a, b))
nengel@2: #define MLS64(d, a, b) MAC64(d, -(a), b)
nengel@2: 
nengel@2: #if HAVE_ARMV5TE
nengel@2: 
nengel@2: /* signed 16x16 -> 32 multiply add accumulate */
nengel@2: #   define MAC16(rt, ra, rb)                                            \
nengel@2:     __asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb));
nengel@2: 
nengel@2: /* signed 16x16 -> 32 multiply */
nengel@2: #   define MUL16 MUL16
nengel@2: static inline av_const int MUL16(int ra, int rb)
nengel@2: {
nengel@2:     int rt;
nengel@2:     __asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb));
nengel@2:     return rt;
nengel@2: }
nengel@2: 
nengel@2: #endif
nengel@2: 
nengel@2: #define mid_pred mid_pred
nengel@2: static inline av_const int mid_pred(int a, int b, int c)
nengel@2: {
nengel@2:     int m;
nengel@2:     __asm__ volatile (
nengel@2:         "mov   %0, %2  \n\t"
nengel@2:         "cmp   %1, %2  \n\t"
nengel@2:         "movgt %0, %1  \n\t"
nengel@2:         "movgt %1, %2  \n\t"
nengel@2:         "cmp   %1, %3  \n\t"
nengel@2:         "movle %1, %3  \n\t"
nengel@2:         "cmp   %0, %1  \n\t"
nengel@2:         "movgt %0, %1  \n\t"
nengel@2:         : "=&r"(m), "+r"(a)
nengel@2:         : "r"(b), "r"(c));
nengel@2:     return m;
nengel@2: }
nengel@2: 
nengel@2: #endif /* HAVE_INLINE_ASM */
nengel@2: 
nengel@2: #endif /* AVCODEC_ARM_MATHOPS_H */