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/*
* Optimization of some functions from mpegvideo.c for armv5te
* Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Some useful links for those who may be interested in optimizing code for ARM.
* ARM Architecture Reference Manual: http://www.arm.com/community/academy/resources.html
* Instructions timings and optimization guide for ARM9E: http://www.arm.com/pdfs/DDI0222B_9EJS_r1p2.pdf
*/
#include "../dsputil.h"
#include "../mpegvideo.h"
#include "../avcodec.h"
#ifdef ENABLE_ARM_TESTS
/**
* h263 dequantizer supplementary function, it is performance critical and needs to
* have optimized implementations for each architecture. Is also used as a reference
* implementation in regression tests
*/
static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
{
int i, level;
for (i = 0; i < count; i++) {
level = block[i];
if (level) {
if (level < 0) {
level = level * qmul - qadd;
} else {
level = level * qmul + qadd;
}
block[i] = level;
}
}
}
#endif
/* GCC 3.1 or higher is required to support symbolic names in assembly code */
#if (__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1))
/**
* Special optimized version of dct_unquantize_h263_helper_c, it requires the block
* to be at least 8 bytes aligned, and may process more elements than requested.
* But it is guaranteed to never process more than 64 elements provided that
* xxcount argument is <= 64, so it is safe. This macro is optimized for a common
* distribution of values for nCoeffs (they are mostly multiple of 8 plus one or
* two extra elements). So this macro processes data as 8 elements per loop iteration
* and contains optional 2 elements processing in the end.
*
* Inner loop should take 6 cycles per element on arm926ej-s (Nokia 770)
*/
#define dct_unquantize_h263_special_helper_armv5te(xxblock, xxqmul, xxqadd, xxcount) \
({ DCTELEM *xblock = xxblock; \
int xqmul = xxqmul, xqadd = xxqadd, xcount = xxcount, xtmp; \
int xdata1, xdata2; \
__asm__ __volatile__( \
"subs %[count], #2 \n\t" \
"ble 2f \n\t" \
"ldrd r4, [%[block], #0] \n\t" \
"1: \n\t" \
"ldrd r6, [%[block], #8] \n\t" \
\
"rsbs %[data1], %[zero], r4, asr #16 \n\t" \
"addgt %[data1], %[qadd], #0 \n\t" \
"rsblt %[data1], %[qadd], #0 \n\t" \
"smlatbne %[data1], r4, %[qmul], %[data1] \n\t" \
\
"rsbs %[data2], %[zero], r5, asr #16 \n\t" \
"addgt %[data2], %[qadd], #0 \n\t" \
"rsblt %[data2], %[qadd], #0 \n\t" \
"smlatbne %[data2], r5, %[qmul], %[data2] \n\t" \
\
"rsbs %[tmp], %[zero], r4, asl #16 \n\t" \
"addgt %[tmp], %[qadd], #0 \n\t" \
"rsblt %[tmp], %[qadd], #0 \n\t" \
"smlabbne r4, r4, %[qmul], %[tmp] \n\t" \
\
"rsbs %[tmp], %[zero], r5, asl #16 \n\t" \
"addgt %[tmp], %[qadd], #0 \n\t" \
"rsblt %[tmp], %[qadd], #0 \n\t" \
"smlabbne r5, r5, %[qmul], %[tmp] \n\t" \
\
"strh r4, [%[block]], #2 \n\t" \
"strh %[data1], [%[block]], #2 \n\t" \
"strh r5, [%[block]], #2 \n\t" \
"strh %[data2], [%[block]], #2 \n\t" \
\
"rsbs %[data1], %[zero], r6, asr #16 \n\t" \
"addgt %[data1], %[qadd], #0 \n\t" \
"rsblt %[data1], %[qadd], #0 \n\t" \
"smlatbne %[data1], r6, %[qmul], %[data1] \n\t" \
\
"rsbs %[data2], %[zero], r7, asr #16 \n\t" \
"addgt %[data2], %[qadd], #0 \n\t" \
"rsblt %[data2], %[qadd], #0 \n\t" \
"smlatbne %[data2], r7, %[qmul], %[data2] \n\t" \
\
"rsbs %[tmp], %[zero], r6, asl #16 \n\t" \
"addgt %[tmp], %[qadd], #0 \n\t" \
"rsblt %[tmp], %[qadd], #0 \n\t" \
"smlabbne r6, r6, %[qmul], %[tmp] \n\t" \
\
"rsbs %[tmp], %[zero], r7, asl #16 \n\t" \
"addgt %[tmp], %[qadd], #0 \n\t" \
"rsblt %[tmp], %[qadd], #0 \n\t" \
"smlabbne r7, r7, %[qmul], %[tmp] \n\t" \
\
"strh r6, [%[block]], #2 \n\t" \
"strh %[data1], [%[block]], #2 \n\t" \
"strh r7, [%[block]], #2 \n\t" \
"strh %[data2], [%[block]], #2 \n\t" \
\
"subs %[count], #8 \n\t" \
"ldrgtd r4, [%[block], #0] \n\t" /* load data early to avoid load/use pipeline stall */ \
"bgt 1b \n\t" \
\
"adds %[count], #2 \n\t" \
"ble 3f \n\t" \
"2: \n\t" \
"ldrsh %[data1], [%[block], #0] \n\t" \
"ldrsh %[data2], [%[block], #2] \n\t" \
"mov %[tmp], %[qadd] \n\t" \
"cmp %[data1], #0 \n\t" \
"rsblt %[tmp], %[qadd], #0 \n\t" \
"smlabbne %[data1], %[data1], %[qmul], %[tmp] \n\t" \
"mov %[tmp], %[qadd] \n\t" \
"cmp %[data2], #0 \n\t" \
"rsblt %[tmp], %[qadd], #0 \n\t" \
"smlabbne %[data2], %[data2], %[qmul], %[tmp] \n\t" \
"strh %[data1], [%[block]], #2 \n\t" \
"strh %[data2], [%[block]], #2 \n\t" \
"3: \n\t" \
: [block] "+&r" (xblock), [count] "+&r" (xcount), [tmp] "=&r" (xtmp), \
[data1] "=&r" (xdata1), [data2] "=&r" (xdata2) \
: [qmul] "r" (xqmul), [qadd] "r" (xqadd), [zero] "r" (0) \
: "r4", "r5", "r6", "r7", "cc", "memory" \
); \
})
static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
DCTELEM *block, int n, int qscale)
{
int i, level, qmul, qadd;
int nCoeffs;
assert(s->block_last_index[n]>=0);
qmul = qscale << 1;
if (!s->h263_aic) {
if (n < 4)
level = block[0] * s->y_dc_scale;
else
level = block[0] * s->c_dc_scale;
qadd = (qscale - 1) | 1;
}else{
qadd = 0;
level = block[0];
}
if(s->ac_pred)
nCoeffs=63;
else
nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1);
block[0] = level;
}
static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
DCTELEM *block, int n, int qscale)
{
int i, level, qmul, qadd;
int nCoeffs;
assert(s->block_last_index[n]>=0);
qadd = (qscale - 1) | 1;
qmul = qscale << 1;
nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1);
}
#define HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED
#endif
void MPV_common_init_armv5te(MpegEncContext *s)
{
#ifdef HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED
s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
#endif
}
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