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4cb6964244
The vector dequantization has a test in a loop preventing effective SIMD
implementation. By moving it out of the loop, this loop can be DSPized.
Therefore, modify the current DSP implementation. In particular, the
DSP implementation no longer has to handle null loop sizes.
The decode_hf implementations have following timings:
For x86 Arrandale:
C SSE SSE2 SSE4
win32: 260 162 119 104
win64: 242 N/A 89 72
The arm NEON optimizations follow in a later patch as external asm. The
now unused check for the y modifier in arm inline asm is removed from
configure.
85 lines
3.2 KiB
C
85 lines
3.2 KiB
C
/*
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* Copyright (c) 2011 Mans Rullgard <mans@mansr.com>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_DCA_H
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#define AVCODEC_ARM_DCA_H
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#include <stdint.h>
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#include "config.h"
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#include "libavcodec/dcadsp.h"
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#include "libavcodec/mathops.h"
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#if HAVE_ARMV6_INLINE && AV_GCC_VERSION_AT_LEAST(4,4)
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#define decode_blockcodes decode_blockcodes
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static inline int decode_blockcodes(int code1, int code2, int levels,
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int32_t *values)
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{
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int32_t v0, v1, v2, v3, v4, v5;
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__asm__ ("smmul %8, %14, %18 \n"
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"smmul %11, %15, %18 \n"
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"smlabb %14, %8, %17, %14 \n"
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"smlabb %15, %11, %17, %15 \n"
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"smmul %9, %8, %18 \n"
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"smmul %12, %11, %18 \n"
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"sub %14, %14, %16, lsr #1 \n"
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"sub %15, %15, %16, lsr #1 \n"
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"smlabb %8, %9, %17, %8 \n"
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"smlabb %11, %12, %17, %11 \n"
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"smmul %10, %9, %18 \n"
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"smmul %13, %12, %18 \n"
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"str %14, %0 \n"
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"str %15, %4 \n"
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"sub %8, %8, %16, lsr #1 \n"
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"sub %11, %11, %16, lsr #1 \n"
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"smlabb %9, %10, %17, %9 \n"
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"smlabb %12, %13, %17, %12 \n"
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"smmul %14, %10, %18 \n"
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"smmul %15, %13, %18 \n"
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"str %8, %1 \n"
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"str %11, %5 \n"
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"sub %9, %9, %16, lsr #1 \n"
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"sub %12, %12, %16, lsr #1 \n"
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"smlabb %10, %14, %17, %10 \n"
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"smlabb %13, %15, %17, %13 \n"
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"str %9, %2 \n"
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"str %12, %6 \n"
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"sub %10, %10, %16, lsr #1 \n"
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"sub %13, %13, %16, lsr #1 \n"
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"str %10, %3 \n"
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"str %13, %7 \n"
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: "=m"(values[0]), "=m"(values[1]),
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"=m"(values[2]), "=m"(values[3]),
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"=m"(values[4]), "=m"(values[5]),
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"=m"(values[6]), "=m"(values[7]),
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"=&r"(v0), "=&r"(v1), "=&r"(v2),
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"=&r"(v3), "=&r"(v4), "=&r"(v5),
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"+&r"(code1), "+&r"(code2)
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: "r"(levels - 1), "r"(-levels), "r"(ff_inverse[levels]));
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return code1 | code2;
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}
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#endif
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#endif /* AVCODEC_ARM_DCA_H */
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