mirror of https://git.ffmpeg.org/ffmpeg.git
dca: ARMv6 optimised decode_blockcode()
Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit 08e3dea3f7f69309574dafc0af6671615e909720) Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -23,6 +23,45 @@
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#include <stdint.h>
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#include "config.h"
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#include "libavutil/intmath.h"
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#if HAVE_ARMV6 && HAVE_INLINE_ASM
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#define decode_blockcode decode_blockcode
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static inline int decode_blockcode(int code, int levels, int *values)
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{
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int v0, v1, v2, v3;
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__asm__ ("smmul %4, %8, %11 \n"
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"smlabb %8, %4, %10, %8 \n"
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"smmul %5, %4, %11 \n"
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"sub %8, %8, %9, lsr #1 \n"
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"smlabb %4, %5, %10, %4 \n"
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"smmul %6, %5, %11 \n"
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"str %8, %0 \n"
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"sub %4, %4, %9, lsr #1 \n"
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"smlabb %5, %6, %10, %5 \n"
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"smmul %7, %6, %11 \n"
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"str %4, %1 \n"
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"sub %5, %5, %9, lsr #1 \n"
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"smlabb %6, %7, %10, %6 \n"
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"cmp %7, #0 \n"
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"str %5, %2 \n"
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"sub %6, %6, %9, lsr #1 \n"
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"it eq \n"
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"mvneq %7, #0 \n"
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"str %6, %3 \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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"=&r"(v0), "=&r"(v1), "=&r"(v2), "=&r"(v3),
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"+&r"(code)
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: "r"(levels - 1), "r"(-levels), "r"(ff_inverse[levels])
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: "cc");
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return v3;
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}
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#endif
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#if HAVE_NEON && HAVE_INLINE_ASM && HAVE_ASM_MOD_Y
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@ -1038,6 +1038,7 @@ static void dca_downmix(float *samples, int srcfmt,
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}
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#ifndef decode_blockcode
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/* Very compact version of the block code decoder that does not use table
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* look-up but is slightly slower */
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static int decode_blockcode(int code, int levels, int *values)
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@ -1058,6 +1059,7 @@ static int decode_blockcode(int code, int levels, int *values)
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return -1;
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}
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}
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#endif
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static const uint8_t abits_sizes[7] = { 7, 10, 12, 13, 15, 17, 19 };
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static const uint8_t abits_levels[7] = { 3, 5, 7, 9, 13, 17, 25 };
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