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249 lines
8.4 KiB
ArmAsm
249 lines
8.4 KiB
ArmAsm
/**
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* Copyright (C) 2010 Mans Rullgard
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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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#include "asm.S"
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.macro rac_get_prob h, bs, buf, cw, pr, t0, t1
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adds \bs, \bs, \t0
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lsl \cw, \cw, \t0
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lsl \t0, \h, \t0
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rsb \h, \pr, #256
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it cs
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ldrhcs \t1, [\buf], #2
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smlabb \h, \t0, \pr, \h
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T itttt cs
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rev16cs \t1, \t1
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A orrcs \cw, \cw, \t1, lsl \bs
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T lslcs \t1, \t1, \bs
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T orrcs \cw, \cw, \t1
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subcs \bs, \bs, #16
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lsr \h, \h, #8
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cmp \cw, \h, lsl #16
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itt ge
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subge \cw, \cw, \h, lsl #16
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subge \h, \t0, \h
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.endm
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.macro rac_get_128 h, bs, buf, cw, t0, t1
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adds \bs, \bs, \t0
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lsl \cw, \cw, \t0
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lsl \t0, \h, \t0
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it cs
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ldrhcs \t1, [\buf], #2
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mov \h, #128
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it cs
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rev16cs \t1, \t1
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add \h, \h, \t0, lsl #7
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A orrcs \cw, \cw, \t1, lsl \bs
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T ittt cs
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T lslcs \t1, \t1, \bs
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T orrcs \cw, \cw, \t1
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subcs \bs, \bs, #16
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lsr \h, \h, #8
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cmp \cw, \h, lsl #16
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itt ge
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subge \cw, \cw, \h, lsl #16
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subge \h, \t0, \h
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.endm
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function ff_decode_block_coeffs_armv6, export=1
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push {r0,r1,r4-r11,lr}
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movrel lr, X(ff_vp56_norm_shift)
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ldrd r4, r5, [sp, #44] @ token_prob, qmul
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cmp r3, #0
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ldr r11, [r5]
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ldm r0, {r5-r7} @ high, bits, buf
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it ne
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pkhtbne r11, r11, r11, asr #16
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ldr r8, [r0, #16] @ code_word
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0:
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ldrb r9, [lr, r5]
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add r3, r3, #1
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ldrb r0, [r4, #1]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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blt 2f
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ldrb r9, [lr, r5]
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ldrb r0, [r4, #2]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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ldrb r9, [lr, r5]
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bge 3f
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add r4, r3, r3, lsl #5
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sxth r12, r11
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add r4, r2, r4
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adds r6, r6, r9
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add r4, r4, #11
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lsl r8, r8, r9
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it cs
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ldrhcs r10, [r7], #2
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lsl r9, r5, r9
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mov r5, #128
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it cs
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rev16cs r10, r10
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add r5, r5, r9, lsl #7
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T ittt cs
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T lslcs r10, r10, r6
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T orrcs r8, r8, r10
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A orrcs r8, r8, r10, lsl r6
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subcs r6, r6, #16
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lsr r5, r5, #8
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cmp r8, r5, lsl #16
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movrel r10, zigzag_scan-1
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itt ge
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subge r8, r8, r5, lsl #16
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subge r5, r9, r5
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ldrb r10, [r10, r3]
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it ge
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rsbge r12, r12, #0
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cmp r3, #16
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strh r12, [r1, r10]
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bge 6f
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5:
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ldrb r9, [lr, r5]
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ldrb r0, [r4]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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pkhtb r11, r11, r11, asr #16
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bge 0b
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6:
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ldr r0, [sp]
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ldr r9, [r0, #12]
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cmp r7, r9
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it hi
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movhi r7, r9
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stm r0, {r5-r7} @ high, bits, buf
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str r8, [r0, #16] @ code_word
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add sp, sp, #8
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mov r0, r3
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pop {r4-r11,pc}
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2:
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add r4, r3, r3, lsl #5
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cmp r3, #16
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add r4, r2, r4
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pkhtb r11, r11, r11, asr #16
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bne 0b
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b 6b
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3:
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ldrb r0, [r4, #3]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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ldrb r9, [lr, r5]
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bge 1f
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mov r12, #2
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ldrb r0, [r4, #4]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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it ge
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addge r12, #1
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ldrb r9, [lr, r5]
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blt 4f
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ldrb r0, [r4, #5]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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it ge
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addge r12, #1
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ldrb r9, [lr, r5]
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b 4f
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1:
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ldrb r0, [r4, #6]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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ldrb r9, [lr, r5]
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bge 3f
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ldrb r0, [r4, #7]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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ldrb r9, [lr, r5]
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bge 2f
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mov r12, #5
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mov r0, #159
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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it ge
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addge r12, r12, #1
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ldrb r9, [lr, r5]
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b 4f
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2:
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mov r12, #7
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mov r0, #165
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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it ge
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addge r12, r12, #2
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ldrb r9, [lr, r5]
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mov r0, #145
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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it ge
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addge r12, r12, #1
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ldrb r9, [lr, r5]
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b 4f
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3:
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ldrb r0, [r4, #8]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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it ge
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addge r4, r4, #1
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ldrb r9, [lr, r5]
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ite ge
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movge r12, #2
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movlt r12, #0
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ldrb r0, [r4, #9]
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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mov r9, #8
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it ge
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addge r12, r12, #1
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movrel r4, X(ff_vp8_dct_cat_prob)
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lsl r9, r9, r12
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ldr r4, [r4, r12, lsl #2]
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add r12, r9, #3
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mov r1, #0
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ldrb r0, [r4], #1
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1:
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ldrb r9, [lr, r5]
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lsl r1, r1, #1
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rac_get_prob r5, r6, r7, r8, r0, r9, r10
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ldrb r0, [r4], #1
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it ge
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addge r1, r1, #1
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cmp r0, #0
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bne 1b
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ldrb r9, [lr, r5]
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add r12, r12, r1
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ldr r1, [sp, #4]
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4:
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add r4, r3, r3, lsl #5
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add r4, r2, r4
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add r4, r4, #22
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rac_get_128 r5, r6, r7, r8, r9, r10
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it ge
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rsbge r12, r12, #0
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smulbb r12, r12, r11
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movrel r9, zigzag_scan-1
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ldrb r9, [r9, r3]
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cmp r3, #16
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strh r12, [r1, r9]
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bge 6b
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b 5b
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endfunc
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const zigzag_scan
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.byte 0, 2, 8, 16
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.byte 10, 4, 6, 12
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.byte 18, 24, 26, 20
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.byte 14, 22, 28, 30
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endconst
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