301 lines
10 KiB
NASM
301 lines
10 KiB
NASM
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; Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license and patent
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; grant that can be found in the LICENSE file in the root of the source
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; tree. All contributing project authors may be found in the AUTHORS
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; file in the root of the source tree.
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;
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EXPORT |vp8cx_pack_tokens_armv7|
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INCLUDE vpx_vp8_enc_asm_offsets.asm
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ARM
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REQUIRE8
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PRESERVE8
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AREA |.text|, CODE, READONLY
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; r0 vp8_writer *w
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; r1 const TOKENEXTRA *p
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; r2 int xcount
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; r3 vp8_coef_encodings
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; s0 vp8_extra_bits
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; s1 vp8_coef_tree
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|vp8cx_pack_tokens_armv7| PROC
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push {r4-r11, lr}
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; Add size of xcount * sizeof (TOKENEXTRA) to get stop
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; sizeof (TOKENEXTRA) is 20
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add r2, r2, r2, lsl #2 ; xcount
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sub sp, sp, #12
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add r2, r1, r2, lsl #2 ; stop = p + xcount
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str r2, [sp, #0]
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str r3, [sp, #8] ; save vp8_coef_encodings
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ldr r2, [r0, #vp8_writer_lowvalue]
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ldr r5, [r0, #vp8_writer_range]
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ldr r3, [r0, #vp8_writer_count]
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b check_p_lt_stop
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while_p_lt_stop
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ldr r6, [r1, #tokenextra_token] ; t
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ldr r4, [sp, #8] ; vp8_coef_encodings
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mov lr, #0
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add r4, r4, r6, lsl #3 ; a = vp8_coef_encodings + t
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ldr r9, [r1, #tokenextra_context_tree] ; pp
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ldr r7, [r1, #tokenextra_skip_eob_node]
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ldr r6, [r4, #vp8_token_value] ; v
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ldr r8, [r4, #vp8_token_len] ; n
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; vp8 specific skip_eob_node
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cmp r7, #0
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movne lr, #2 ; i = 2
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subne r8, r8, #1 ; --n
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; reverse the stream of bits to be packed. Normally
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; the most significant bit is peeled off and compared
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; in the form of (v >> --n) & 1. ARM architecture has
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; the ability to set a flag based on the value of the
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; bit shifted off the bottom of the register. To make
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; that happen the bitstream is reversed.
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rbit r12, r6
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rsb r4, r8, #32 ; 32-n
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ldr r10, [sp, #52] ; vp8_coef_tree
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; v is kept in r12 during the token pack loop
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lsr r12, r12, r4 ; v >>= 32 - n
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; loop start
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token_loop
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ldrb r4, [r9, lr, asr #1] ; pp [i>>1]
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sub r7, r5, #1 ; range-1
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; Decisions are made based on the bit value shifted
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; off of v, so set a flag here based on this.
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; This value is refered to as "bb"
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lsrs r12, r12, #1 ; bb = v >> n
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mul r4, r4, r7 ; ((range-1) * pp[i>>1]))
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; bb can only be 0 or 1. So only execute this statement
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; if bb == 1, otherwise it will act like i + 0
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addcs lr, lr, #1 ; i + bb
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mov r7, #1
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ldrsb lr, [r10, lr] ; i = vp8_coef_tree[i+bb]
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add r4, r7, r4, lsr #8 ; 1 + (((range-1) * pp[i>>1]) >> 8)
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addcs r2, r2, r4 ; if (bb) lowvalue += split
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subcs r4, r5, r4 ; if (bb) range = range-split
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; Counting the leading zeros is used to normalize range.
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clz r6, r4
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sub r6, r6, #24 ; shift
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; Flag is set on the sum of count. This flag is used later
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; to determine if count >= 0
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adds r3, r3, r6 ; count += shift
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lsl r5, r4, r6 ; range <<= shift
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bmi token_count_lt_zero ; if(count >= 0)
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sub r6, r6, r3 ; offset = shift - count
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sub r4, r6, #1 ; offset-1
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lsls r4, r2, r4 ; if((lowvalue<<(offset-1)) & 0x80000000 )
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bpl token_high_bit_not_set
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ldr r4, [r0, #vp8_writer_pos] ; x
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sub r4, r4, #1 ; x = w->pos-1
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b token_zero_while_start
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token_zero_while_loop
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mov r10, #0
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strb r10, [r7, r4] ; w->buffer[x] =(unsigned char)0
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sub r4, r4, #1 ; x--
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token_zero_while_start
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cmp r4, #0
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ldrge r7, [r0, #vp8_writer_buffer]
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ldrb r11, [r7, r4]
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cmpge r11, #0xff
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beq token_zero_while_loop
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ldr r7, [r0, #vp8_writer_buffer]
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ldrb r10, [r7, r4] ; w->buffer[x]
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add r10, r10, #1
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strb r10, [r7, r4] ; w->buffer[x] + 1
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token_high_bit_not_set
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rsb r4, r6, #24 ; 24-offset
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ldr r10, [r0, #vp8_writer_buffer]
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lsr r7, r2, r4 ; lowvalue >> (24-offset)
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ldr r4, [r0, #vp8_writer_pos] ; w->pos
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lsl r2, r2, r6 ; lowvalue <<= offset
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mov r6, r3 ; shift = count
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add r11, r4, #1 ; w->pos++
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bic r2, r2, #0xff000000 ; lowvalue &= 0xffffff
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str r11, [r0, #vp8_writer_pos]
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sub r3, r3, #8 ; count -= 8
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strb r7, [r10, r4] ; w->buffer[w->pos++]
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; r10 is used earlier in the loop, but r10 is used as
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; temp variable here. So after r10 is used, reload
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; vp8_coef_tree_dcd into r10
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ldr r10, [sp, #52] ; vp8_coef_tree
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token_count_lt_zero
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lsl r2, r2, r6 ; lowvalue <<= shift
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subs r8, r8, #1 ; --n
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bne token_loop
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ldr r6, [r1, #tokenextra_token] ; t
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ldr r7, [sp, #48] ; vp8_extra_bits
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; Add t * sizeof (vp8_extra_bit_struct) to get the desired
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; element. Here vp8_extra_bit_struct == 20
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add r6, r6, r6, lsl #2 ; b = vp8_extra_bits + t
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add r12, r7, r6, lsl #2 ; b = vp8_extra_bits + t
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ldr r4, [r12, #vp8_extra_bit_struct_base_val]
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cmp r4, #0
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beq skip_extra_bits
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; if( b->base_val)
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ldr r8, [r12, #vp8_extra_bit_struct_len] ; L
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ldr lr, [r1, #tokenextra_extra] ; e = p->Extra
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cmp r8, #0 ; if( L)
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beq no_extra_bits
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ldr r9, [r12, #vp8_extra_bit_struct_prob]
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asr r7, lr, #1 ; v=e>>1
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ldr r10, [r12, #vp8_extra_bit_struct_tree]
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str r10, [sp, #4] ; b->tree
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rbit r12, r7 ; reverse v
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rsb r4, r8, #32
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lsr r12, r12, r4
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mov lr, #0 ; i = 0
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extra_bits_loop
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ldrb r4, [r9, lr, asr #1] ; pp[i>>1]
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sub r7, r5, #1 ; range-1
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lsrs r12, r12, #1 ; v >> n
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mul r4, r4, r7 ; (range-1) * pp[i>>1]
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addcs lr, lr, #1 ; i + bb
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mov r7, #1
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ldrsb lr, [r10, lr] ; i = b->tree[i+bb]
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add r4, r7, r4, lsr #8 ; split = 1 + (((range-1) * pp[i>>1]) >> 8)
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addcs r2, r2, r4 ; if (bb) lowvalue += split
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subcs r4, r5, r4 ; if (bb) range = range-split
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clz r6, r4
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sub r6, r6, #24
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adds r3, r3, r6 ; count += shift
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lsl r5, r4, r6 ; range <<= shift
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bmi extra_count_lt_zero ; if(count >= 0)
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sub r6, r6, r3 ; offset= shift - count
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sub r4, r6, #1 ; offset-1
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lsls r4, r2, r4 ; if((lowvalue<<(offset-1)) & 0x80000000 )
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bpl extra_high_bit_not_set
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ldr r4, [r0, #vp8_writer_pos] ; x
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sub r4, r4, #1 ; x = w->pos - 1
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b extra_zero_while_start
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extra_zero_while_loop
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mov r10, #0
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strb r10, [r7, r4] ; w->buffer[x] =(unsigned char)0
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sub r4, r4, #1 ; x--
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extra_zero_while_start
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cmp r4, #0
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ldrge r7, [r0, #vp8_writer_buffer]
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ldrb r11, [r7, r4]
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cmpge r11, #0xff
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beq extra_zero_while_loop
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ldr r7, [r0, #vp8_writer_buffer]
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ldrb r10, [r7, r4]
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add r10, r10, #1
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strb r10, [r7, r4]
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extra_high_bit_not_set
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rsb r4, r6, #24 ; 24-offset
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ldr r10, [r0, #vp8_writer_buffer]
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lsr r7, r2, r4 ; lowvalue >> (24-offset)
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ldr r4, [r0, #vp8_writer_pos]
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lsl r2, r2, r6 ; lowvalue <<= offset
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mov r6, r3 ; shift = count
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add r11, r4, #1 ; w->pos++
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bic r2, r2, #0xff000000 ; lowvalue &= 0xffffff
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str r11, [r0, #vp8_writer_pos]
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sub r3, r3, #8 ; count -= 8
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strb r7, [r10, r4] ; w->buffer[w->pos++]=(lowvalue >> (24-offset))
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ldr r10, [sp, #4] ; b->tree
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extra_count_lt_zero
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lsl r2, r2, r6
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subs r8, r8, #1 ; --n
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bne extra_bits_loop ; while (n)
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no_extra_bits
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ldr lr, [r1, #4] ; e = p->Extra
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add r4, r5, #1 ; range + 1
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tst lr, #1
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lsr r4, r4, #1 ; split = (range + 1) >> 1
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addne r2, r2, r4 ; lowvalue += split
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subne r4, r5, r4 ; range = range-split
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tst r2, #0x80000000 ; lowvalue & 0x80000000
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lsl r5, r4, #1 ; range <<= 1
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beq end_high_bit_not_set
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ldr r4, [r0, #vp8_writer_pos]
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mov r7, #0
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sub r4, r4, #1
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b end_zero_while_start
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end_zero_while_loop
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strb r7, [r6, r4]
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sub r4, r4, #1 ; x--
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end_zero_while_start
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cmp r4, #0
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ldrge r6, [r0, #vp8_writer_buffer]
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ldrb r12, [r6, r4]
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cmpge r12, #0xff
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beq end_zero_while_loop
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ldr r6, [r0, #vp8_writer_buffer]
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ldrb r7, [r6, r4]
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add r7, r7, #1
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strb r7, [r6, r4]
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end_high_bit_not_set
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adds r3, r3, #1 ; ++count
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lsl r2, r2, #1 ; lowvalue <<= 1
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bne end_count_zero
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ldr r4, [r0, #vp8_writer_pos]
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mvn r3, #7
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ldr r7, [r0, #vp8_writer_buffer]
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lsr r6, r2, #24 ; lowvalue >> 24
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add r12, r4, #1 ; w->pos++
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bic r2, r2, #0xff000000 ; lowvalue &= 0xffffff
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str r12, [r0, #0x10]
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strb r6, [r7, r4]
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end_count_zero
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skip_extra_bits
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add r1, r1, #TOKENEXTRA_SZ ; ++p
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check_p_lt_stop
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ldr r4, [sp, #0] ; stop
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cmp r1, r4 ; while( p < stop)
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bcc while_p_lt_stop
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str r2, [r0, #vp8_writer_lowvalue]
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str r5, [r0, #vp8_writer_range]
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str r3, [r0, #vp8_writer_count]
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add sp, sp, #12
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pop {r4-r11, pc}
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ENDP
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END
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