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/*
* Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
*
* 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 "libavutil/arm/asm.S"
function flac_lpc_16_1_arm
ldr r12, [sp]
push {r4, lr}
ldr r1, [r1]
subs r12, r12, #2
ldr lr, [r0], #4
beq 2f
it lt
poplt {r4, pc}
1:
mul r4, lr, r1
ldm r0, {r2, lr}
add_sh r2, r2, r4, asr r3
mul r4, r2, r1
subs r12, r12, #2
add_sh lr, lr, r4, asr r3
stm r0!, {r2, lr}
bgt 1b
it lt
poplt {r4, pc}
2:
mul r4, lr, r1
ldr r2, [r0]
add_sh r2, r2, r4, asr r3
str r2, [r0]
pop {r4, pc}
endfunc
function flac_lpc_16_2_arm
ldr r12, [sp]
subs r12, r12, r2
it le
bxle lr
push {r4-r9, lr}
ldm r0!, {r6, r7}
ldm r1, {r8, r9}
subs r12, r12, #1
beq 2f
1:
mul r4, r6, r8
mul r5, r7, r8
mla r4, r7, r9, r4
ldm r0, {r6, r7}
add_sh r6, r6, r4, asr r3
mla r5, r6, r9, r5
add_sh r7, r7, r5, asr r3
stm r0!, {r6, r7}
subs r12, r12, #2
bgt 1b
it lt
poplt {r4-r9, pc}
2:
mul r4, r6, r8
mla r4, r7, r9, r4
ldr r5, [r0]
add_sh r5, r5, r4, asr r3
str r5, [r0]
pop {r4-r9, pc}
endfunc
function ff_flac_lpc_16_arm, export=1
cmp r2, #2
blt flac_lpc_16_1_arm
beq flac_lpc_16_2_arm
ldr r12, [sp]
subs r12, r12, r2
it le
bxle lr
push {r4-r9, lr}
subs r12, r12, #1
beq 3f
1:
sub lr, r2, #2
mov r4, #0
mov r5, #0
ldr r7, [r0], #4
ldr r9, [r1], #4
2:
mla r4, r7, r9, r4
ldm r0!, {r6, r7}
mla r5, r6, r9, r5
ldm r1!, {r8, r9}
mla r4, r6, r8, r4
subs lr, lr, #2
mla r5, r7, r8, r5
bgt 2b
blt 6f
mla r4, r7, r9, r4
ldr r7, [r0], #4
mla r5, r7, r9, r5
ldr r9, [r1], #4
6:
mla r4, r7, r9, r4
ldm r0, {r6, r7}
add_sh r6, r6, r4, asr r3
mla r5, r6, r9, r5
add_sh r7, r7, r5, asr r3
stm r0!, {r6, r7}
sub r0, r0, r2, lsl #2
sub r1, r1, r2, lsl #2
subs r12, r12, #2
bgt 1b
it lt
poplt {r4-r9, pc}
3:
mov r4, #0
4:
ldr r5, [r1], #4
ldr r6, [r0], #4
mla r4, r5, r6, r4
subs r2, r2, #1
bgt 4b
ldr r5, [r0]
add_sh r5, r5, r4, asr r3
str r5, [r0]
pop {r4-r9, pc}
endfunc