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/* |
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* simple math operations |
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* Copyright (c) 2006 Michael Niedermayer et al |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 FFmpeg; 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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#ifndef AVCODEC_ARM_MATHOPS_H |
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#define AVCODEC_ARM_MATHOPS_H |
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#include |
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#include "config.h" |
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#include "libavutil/common.h" |
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#if HAVE_INLINE_ASM |
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#if HAVE_ARMV6_INLINE |
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#define MULH MULH |
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static inline av_const int MULH(int a, int b) |
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{ |
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int r; |
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__asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b)); |
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return r; |
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} |
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#define FASTDIV FASTDIV |
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static av_always_inline av_const int FASTDIV(int a, int b) |
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{ |
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int r; |
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__asm__ ("cmp %2, #2 \n\t" |
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"ldr %0, [%3, %2, lsl #2] \n\t" |
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"ite le \n\t" |
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"lsrle %0, %1, #1 \n\t" |
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"smmulgt %0, %0, %1 \n\t" |
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: "=&r"(r) : "r"(a), "r"(b), "r"(ff_inverse) : "cc"); |
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return r; |
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} |
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#else /* HAVE_ARMV6_INLINE */ |
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#define FASTDIV FASTDIV |
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static av_always_inline av_const int FASTDIV(int a, int b) |
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{ |
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int r, t; |
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__asm__ ("umull %1, %0, %2, %3" |
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: "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b])); |
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return r; |
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} |
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#endif |
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#define MLS64(d, a, b) MAC64(d, -(a), b) |
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#if HAVE_ARMV5TE_INLINE |
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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, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb)); |
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/* signed 16x16 -> 32 multiply */ |
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# define MUL16 MUL16 |
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static inline av_const int MUL16(int ra, int rb) |
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{ |
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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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return rt; |
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} |
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#endif |
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#define mid_pred mid_pred |
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static inline av_const int mid_pred(int a, int b, int c) |
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{ |
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int m; |
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__asm__ ( |
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"mov %0, %2 \n\t" |
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"cmp %1, %2 \n\t" |
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"itt gt \n\t" |
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"movgt %0, %1 \n\t" |
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"movgt %1, %2 \n\t" |
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"cmp %1, %3 \n\t" |
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"it le \n\t" |
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"movle %1, %3 \n\t" |
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"cmp %0, %1 \n\t" |
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"it gt \n\t" |
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"movgt %0, %1 \n\t" |
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: "=&r"(m), "+r"(a) |
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: "r"(b), "r"(c) |
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: "cc"); |
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return m; |
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} |
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#endif /* HAVE_INLINE_ASM */ |
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#endif /* AVCODEC_ARM_MATHOPS_H */ |