[deb_ffmpeg.git] / ffmpeg / libavcodec / arm / mpegvideo_armv5te_s.S

/*
 * 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
 */

#include "config.h"
#include "libavutil/arm/asm.S"

/*
 * 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 count argument is <= 64,
 * so it is safe. This function is optimized for a common distribution
 * of values for nCoeffs (they are mostly multiple of 8 plus one or
 * two extra elements). So this function 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)
 */

.macro  dequant_t       dst, src, mul, add, tmp
        rsbs            \tmp, ip, \src, asr #16
        it              gt
        addgt           \tmp, \add, #0
        it              lt
        rsblt           \tmp, \add, #0
        it              ne
        smlatbne        \dst, \src, \mul, \tmp
.endm

.macro  dequant_b       dst, src, mul, add, tmp
        rsbs            \tmp, ip, \src, lsl #16
        it              gt
        addgt           \tmp, \add, #0
        it              lt
        rsblt           \tmp, \add, #0
        it              ne
        smlabbne        \dst, \src, \mul, \tmp
.endm

function ff_dct_unquantize_h263_armv5te, export=1
        push            {r4-r9,lr}
        mov             ip, #0
        subs            r3, r3, #2
        ble             2f
        ldrd            r4, r5, [r0, #0]
1:
        ldrd            r6, r7, [r0, #8]

        dequant_t       r9, r4, r1, r2, r9
        dequant_t       lr, r5, r1, r2, lr
        dequant_b       r4, r4, r1, r2, r8
        dequant_b       r5, r5, r1, r2, r8

        strh            r4, [r0], #2
        strh            r9, [r0], #2
        strh            r5, [r0], #2
        strh            lr, [r0], #2

        dequant_t       r9, r6, r1, r2, r9
        dequant_t       lr, r7, r1, r2, lr
        dequant_b       r6, r6, r1, r2, r8
        dequant_b       r7, r7, r1, r2, r8

        strh            r6, [r0], #2
        strh            r9, [r0], #2
        strh            r7, [r0], #2
        strh            lr, [r0], #2

        subs            r3, r3, #8
        it              gt
        ldrdgt          r4, r5, [r0, #0] /* load data early to avoid load/use pipeline stall */
        bgt             1b

        adds            r3, r3, #2
        it              le
        pople           {r4-r9,pc}
2:
        ldrsh           r9, [r0, #0]
        ldrsh           lr, [r0, #2]
        mov             r8, r2
        cmp             r9, #0
        it              lt
        rsblt           r8, r2, #0
        it              ne
        smlabbne        r9, r9, r1, r8
        mov             r8, r2
        cmp             lr, #0
        it              lt
        rsblt           r8, r2, #0
        it              ne
        smlabbne        lr, lr, r1, r8
        strh            r9, [r0], #2
        strh            lr, [r0], #2
        pop             {r4-r9,pc}
endfunc
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Optimization of some functions from mpegvideo.c for armv5te
	3	* Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
	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	#include "config.h"
	23	#include "libavutil/arm/asm.S"
	24
	25	/*
	26	* Special optimized version of dct_unquantize_h263_helper_c, it
	27	* requires the block to be at least 8 bytes aligned, and may process
	28	* more elements than requested. But it is guaranteed to never
	29	* process more than 64 elements provided that count argument is <= 64,
	30	* so it is safe. This function is optimized for a common distribution
	31	* of values for nCoeffs (they are mostly multiple of 8 plus one or
	32	* two extra elements). So this function processes data as 8 elements
	33	* per loop iteration and contains optional 2 elements processing in
	34	* the end.
	35	*
	36	* Inner loop should take 6 cycles per element on arm926ej-s (Nokia 770)
	37	*/
	38
	39	.macro dequant_t dst, src, mul, add, tmp
	40	rsbs \tmp, ip, \src, asr #16
	41	it gt
	42	addgt \tmp, \add, #0
	43	it lt
	44	rsblt \tmp, \add, #0
	45	it ne
	46	smlatbne \dst, \src, \mul, \tmp
	47	.endm
	48
	49	.macro dequant_b dst, src, mul, add, tmp
	50	rsbs \tmp, ip, \src, lsl #16
	51	it gt
	52	addgt \tmp, \add, #0
	53	it lt
	54	rsblt \tmp, \add, #0
	55	it ne
	56	smlabbne \dst, \src, \mul, \tmp
	57	.endm
	58
	59	function ff_dct_unquantize_h263_armv5te, export=1
	60	push {r4-r9,lr}
	61	mov ip, #0
	62	subs r3, r3, #2
	63	ble 2f
	64	ldrd r4, r5, [r0, #0]
65	1:
66	ldrd r6, r7, [r0, #8]
67
68	dequant_t r9, r4, r1, r2, r9
69	dequant_t lr, r5, r1, r2, lr
70	dequant_b r4, r4, r1, r2, r8
71	dequant_b r5, r5, r1, r2, r8
72
73	strh r4, [r0], #2
74	strh r9, [r0], #2
75	strh r5, [r0], #2
76	strh lr, [r0], #2
77
78	dequant_t r9, r6, r1, r2, r9
79	dequant_t lr, r7, r1, r2, lr
80	dequant_b r6, r6, r1, r2, r8
81	dequant_b r7, r7, r1, r2, r8
82
83	strh r6, [r0], #2
84	strh r9, [r0], #2
85	strh r7, [r0], #2
86	strh lr, [r0], #2
87
88	subs r3, r3, #8
89	it gt
90	ldrdgt r4, r5, [r0, #0] /* load data early to avoid load/use pipeline stall */
91	bgt 1b
92
93	adds r3, r3, #2
94	it le
95	pople {r4-r9,pc}
96	2:
97	ldrsh r9, [r0, #0]
98	ldrsh lr, [r0, #2]
99	mov r8, r2
100	cmp r9, #0
101	it lt
102	rsblt r8, r2, #0
103	it ne
104	smlabbne r9, r9, r1, r8
105	mov r8, r2
106	cmp lr, #0
107	it lt
108	rsblt r8, r2, #0
109	it ne
110	smlabbne lr, lr, r1, r8
111	strh r9, [r0], #2
112	strh lr, [r0], #2
113	pop {r4-r9,pc}
114	endfunc