mathops.h (2922B)
1 /* 2 * simple math operations 3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22 #ifndef AVCODEC_ARM_MATHOPS_H 23 #define AVCODEC_ARM_MATHOPS_H 24 25 #include <stdint.h> 26 #include "config.h" 27 #include "libavutil/common.h" 28 29 #if HAVE_INLINE_ASM 30 31 #if HAVE_ARMV6_INLINE 32 #define MULH MULH 33 static inline av_const int MULH(int a, int b) 34 { 35 int r; 36 __asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b)); 37 return r; 38 } 39 40 #define FASTDIV FASTDIV 41 static av_always_inline av_const int FASTDIV(int a, int b) 42 { 43 int r; 44 __asm__ ("cmp %2, #2 \n\t" 45 "ldr %0, [%3, %2, lsl #2] \n\t" 46 "ite le \n\t" 47 "lsrle %0, %1, #1 \n\t" 48 "smmulgt %0, %0, %1 \n\t" 49 : "=&r"(r) : "r"(a), "r"(b), "r"(ff_inverse) : "cc"); 50 return r; 51 } 52 53 #else /* HAVE_ARMV6_INLINE */ 54 55 #define FASTDIV FASTDIV 56 static av_always_inline av_const int FASTDIV(int a, int b) 57 { 58 int r, t; 59 __asm__ ("umull %1, %0, %2, %3" 60 : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b])); 61 return r; 62 } 63 #endif 64 65 #define MLS64(d, a, b) MAC64(d, -(a), b) 66 67 #if HAVE_ARMV5TE_INLINE 68 69 /* signed 16x16 -> 32 multiply add accumulate */ 70 # define MAC16(rt, ra, rb) \ 71 __asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb)); 72 73 /* signed 16x16 -> 32 multiply */ 74 # define MUL16 MUL16 75 static inline av_const int MUL16(int ra, int rb) 76 { 77 int rt; 78 __asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb)); 79 return rt; 80 } 81 82 #endif 83 84 #define mid_pred mid_pred 85 static inline av_const int mid_pred(int a, int b, int c) 86 { 87 int m; 88 __asm__ ( 89 "mov %0, %2 \n\t" 90 "cmp %1, %2 \n\t" 91 "itt gt \n\t" 92 "movgt %0, %1 \n\t" 93 "movgt %1, %2 \n\t" 94 "cmp %1, %3 \n\t" 95 "it le \n\t" 96 "movle %1, %3 \n\t" 97 "cmp %0, %1 \n\t" 98 "it gt \n\t" 99 "movgt %0, %1 \n\t" 100 : "=&r"(m), "+r"(a) 101 : "r"(b), "r"(c) 102 : "cc"); 103 return m; 104 } 105 106 #endif /* HAVE_INLINE_ASM */ 107 108 #endif /* AVCODEC_ARM_MATHOPS_H */