@/*****************************************************************************
@*
@* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
@*
@* Licensed under the Apache License, Version 2.0 (the "License");
@* you may not use this file except in compliance with the License.
@* You may obtain a copy of the License at:
@*
@* http://www.apache.org/licenses/LICENSE-2.0
@*
@* Unless required by applicable law or agreed to in writing, software
@* distributed under the License is distributed on an "AS IS" BASIS,
@* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@* See the License for the specific language governing permissions and
@* limitations under the License.
@*
@*****************************************************************************/
@/**
@*******************************************************************************
@* @file
@*  ihevc_intra_pred_chroma_mode_27_to_33.s
@*
@* @brief
@*  contains function definition for intra prediction  interpolation filters
@*
@*
@* @author
@*  parthiban v
@*
@* @par list of functions:
@*  - ihevc_intra_pred_chroma_mode_27_to_33()
@*
@* @remarksll
@*  none
@*
@*******************************************************************************
@*/

@/**
@*******************************************************************************
@*
@* @brief
@*  intraprediction for mode 27 to 33  (positive angle, vertical mode ) with
@* neighboring samples location pointed by 'pu1_ref' to the  tu
@* block location pointed by 'pu1_dst'
@*
@* @par description:
@*
@*
@* @param[in] pu1_src
@*  uword8 pointer to the source
@*
@* @param[in] pu1_dst
@*  uword8 pointer to the destination
@*
@* @param[in] src_strd
@*  integer source stride
@*
@* @param[in] dst_strd
@*  integer destination stride
@*
@* @param[in] nt
@*  integer transform block size
@*
@* @param[in] mode
@*  integer intraprediction mode
@*
@* @returns
@*
@* @remarks
@*  none
@*
@*******************************************************************************
@*/

@.if intra_pred_chroma_27_t0_33 == c
@void ihevc_intra_pred_chroma_mode_27_to_33(uword8 *pu1_ref,
@                                        word32 src_strd,
@                                         uword8 *pu1_dst,
@                                         word32 dst_strd,
@                                         word32 nt,
@                                         word32 mode)

.text
.align 4


.globl ihevc_intra_pred_chroma_mode_27_to_33_a9q
.extern gai4_ihevc_ang_table
.extern gau1_ihevc_planar_factor

gai4_ihevc_ang_table_addr:
.long gai4_ihevc_ang_table - ulbl1 - 8

gau1_ihevc_planar_factor_addr:
.long gau1_ihevc_planar_factor  - ulbl2 - 8


.type ihevc_intra_pred_chroma_mode_27_to_33_a9q, %function

ihevc_intra_pred_chroma_mode_27_to_33_a9q:

    stmfd       sp!, {r4-r12, r14}          @stack stores the values of the arguments

    ldr         r4,[sp,#40]                 @loads nt
    ldr         r5,[sp,#44]                 @loads mode
    ldr         r6,gai4_ihevc_ang_table_addr @loads word32 gai4_ihevc_ang_table[35]
ulbl1:
    add         r6,r6,pc

    lsl         r7,r4,#2                    @four_nt

    add         r8,r6,r5,lsl #2             @*gai4_ihevc_ang_table[mode]
    ldr         r9,[r8]                     @intra_pred_ang = gai4_ihevc_ang_table[mode]
    ldr         r1,gau1_ihevc_planar_factor_addr @used for ((row + 1) * intra_pred_ang) row values
ulbl2:
    add         r1,r1,pc
    add         r6,r1,#1

    tst         r4,#7
    add         r8,r0,r7                    @pu1_ref + four_nt
    mov         lr,#0                       @row
    mov         r12,r4
    bne         core_loop_4
    lsl         r4,r4,#1
    b           core_loop_8

core_loop_8:
    add         r8,r8,#2                    @pu1_ref_main_idx += (four_nt + 1)
    vdup.8      d0,r9                       @intra_pred_ang
    mov         r12,r4,lsr #4               @divide by 8

    vmov.i8     d1,#32
    mul         r7,r4,r12

    vmov.i16    q3,#31

    mov         r1,r8
    mov         r5,r4
    mov         r11,#2

prologue:
    vld1.8      {d3},[r6]                   @loads the row value
    vmull.u8    q1,d3,d0                    @pos = ((row + 1) * intra_pred_ang)
    vand        q2,q1,q3                    @dup_const_fract(fract = pos & (31))
    vmovn.i16   d4,q2
    vshrn.u16   d5,q1,#5                    @idx = pos >> 5

    vdup.8      d31,d4[0]
    add         r0,r2,r3

    vmov.u32    lr,d5[0]                    @(i row)extract idx to the r register
    lsl         lr,lr,#1

    vdup.8      d29,d4[1]                   @(ii)
    and         r9,lr,#0xff                 @(i row) get the last byte

    add         r10,r8,r9                   @(i row)*pu1_ref[ref_main_idx]

    asr         lr,lr,#8                    @(ii)shift by 8
    vld1.8      {d8},[r10],r11              @(i row)ref_main_idx
    and         r9,lr,#0xff                 @(ii)get the last byte

    asr         lr,lr,#8                    @(iii)
    vld1.8      {d9},[r10]                  @(i row)ref_main_idx_1
    add         r12,r8,r9                   @(ii)*pu1_ref[ref_main_idx]

    and         r9,lr,#0xff                 @(iii)
    vsub.u8     d30,d1,d31                  @32-fract(dup_const_32_fract)
    add         r10,r8,r9                   @(iii)*pu1_ref[ref_main_idx]

    vld1.8      {d12},[r12],r11             @(ii)ref_main_idx
    vmull.u8    q5,d8,d30                   @(i row)vmull_u8(ref_main_idx, dup_const_32_fract)

    vld1.8      {d13},[r12]                 @(ii)ref_main_idx_1
    vmlal.u8    q5,d9,d31                   @(i row)vmull_u8(ref_main_idx_1, dup_const_fract)
    asr         lr,lr,#8                    @(iv)

    vdup.8      d27,d4[2]                   @(iii)
    vsub.u8     d28,d1,d29                  @(ii)32-fract(dup_const_32_fract)
    and         r9,lr,#0xff                 @(iv)

    vdup.8      d25,d4[3]                   @(iv)
    vmull.u8    q7,d12,d28                  @(ii)vmull_u8(ref_main_idx, dup_const_32_fract)
    add         r12,r8,r9                   @(iv)*pu1_ref[ref_main_idx]

    vld1.8      {d16},[r10],r11             @(iii)ref_main_idx
    vmlal.u8    q7,d13,d29                  @(ii)vmull_u8(ref_main_idx_1, dup_const_fract)

    vld1.8      {d17},[r10]                 @(iii)ref_main_idx_1
    vrshrn.i16  d10,q5,#5                   @(i row)shift_res = vrshrn_n_u16(add_res, 5)

    vld1.8      {d20},[r12],r11             @(iv)ref_main_idx
    vsub.u8     d26,d1,d27                  @(iii)32-fract(dup_const_32_fract)

    vld1.8      {d21},[r12]                 @(iv)ref_main_idx_1

    vdup.8      d31,d4[4]                   @(v)
    vmull.u8    q9,d16,d26                  @(iii)vmull_u8(ref_main_idx, dup_const_32_fract)

    vmov.u32    lr,d5[1]                    @extract idx to the r register
    vmlal.u8    q9,d17,d27                  @(iii)vmull_u8(ref_main_idx_1, dup_const_fract)
    lsl         lr,lr,#1

    vst1.8      {d10},[r2]!                 @(i row)
    vrshrn.i16  d14,q7,#5                   @(ii)shift_res = vrshrn_n_u16(add_res, 5)

    and         r9,lr,#0xff                 @(v)
    vdup.8      d29,d4[5]                   @(vi)
    add         r10,r8,r9                   @(v)*pu1_ref[ref_main_idx]

    vld1.8      {d8},[r10],r11              @(v)ref_main_idx
    vsub.u8     d24,d1,d25                  @(iv)32-fract(dup_const_32_fract)

    asr         lr,lr,#8                    @(vi)
    vmull.u8    q11,d20,d24                 @(iv)vmull_u8(ref_main_idx, dup_const_32_fract)
    and         r9,lr,#0xff                 @(vi)

    vld1.8      {d9},[r10]                  @(v)ref_main_idx_1
    vmlal.u8    q11,d21,d25                 @(iv)vmull_u8(ref_main_idx_1, dup_const_fract)

    vst1.8      {d14},[r0],r3               @(ii)
    vrshrn.i16  d18,q9,#5                   @(iii)shift_res = vrshrn_n_u16(add_res, 5)

    add         r12,r8,r9                   @(vi)*pu1_ref[ref_main_idx]
    vdup.8      d27,d4[6]                   @(vii)
    asr         lr,lr,#8                    @(vii)

    and         r9,lr,#0xff                 @(vii)
    vsub.u8     d30,d1,d31                  @(v)32-fract(dup_const_32_fract)
    add         r10,r8,r9                   @(vii)*pu1_ref[ref_main_idx]

    vld1.8      {d12},[r12],r11             @(vi)ref_main_idx
    vmull.u8    q5,d8,d30                   @(v)vmull_u8(ref_main_idx, dup_const_32_fract)

    vld1.8      {d13},[r12]                 @(vi)ref_main_idx_1
    vmlal.u8    q5,d9,d31                   @(v)vmull_u8(ref_main_idx_1, dup_const_fract)

    vst1.8      {d18},[r0],r3               @(iii)
    vrshrn.i16  d22,q11,#5                  @(iv)shift_res = vrshrn_n_u16(add_res, 5)

    asr         lr,lr,#8                    @(viii)
    vdup.8      d25,d4[7]                   @(viii)
    and         r9,lr,#0xff                 @(viii)

    vld1.8      {d16},[r10],r11             @(vii)ref_main_idx
    vsub.u8     d28,d1,d29                  @(vi)32-fract(dup_const_32_fract)

    vld1.8      {d17},[r10]                 @(vii)ref_main_idx_1
    vmull.u8    q7,d12,d28                  @(vi)vmull_u8(ref_main_idx, dup_const_32_fract)

    add         r12,r8,r9                   @(viii)*pu1_ref[ref_main_idx]
    vmlal.u8    q7,d13,d29                  @(vi)vmull_u8(ref_main_idx_1, dup_const_fract)
    subs        r7,r7,#8

    vst1.8      {d22},[r0],r3               @(iv)
    vrshrn.i16  d10,q5,#5                   @(v)shift_res = vrshrn_n_u16(add_res, 5)

    vld1.8      {d20},[r12],r11             @(viii)ref_main_idx
    vsub.u8     d26,d1,d27                  @(vii)32-fract(dup_const_32_fract)

    vld1.8      {d21},[r12]                 @(viii)ref_main_idx_1
    vmull.u8    q9,d16,d26                  @(vii)vmull_u8(ref_main_idx, dup_const_32_fract)

    addgt       r8,r8,#8
    vmlal.u8    q9,d17,d27                  @(vii)vmull_u8(ref_main_idx_1, dup_const_fract)
    subgt       r4,r4,#8

    vst1.8      {d10},[r0],r3               @(v)
    vrshrn.i16  d14,q7,#5                   @(vi)shift_res = vrshrn_n_u16(add_res, 5)

    beq         epilogue

    vld1.8      {d5},[r6]                   @loads the row value
    vmull.u8    q1,d5,d0                    @pos = ((row + 1) * intra_pred_ang)
    vand        q2,q1,q3                    @dup_const_fract(fract = pos & (31))
    vmovn.i16   d4,q2
    vshrn.u16   d3,q1,#5                    @idx = pos >> 5
    vmov.u32    lr,d3[0]                    @(i)extract idx to the r register
    lsl         lr,lr,#1
    and         r9,lr,#0xff                 @(i)
    add         r10,r8,r9                   @(i)*pu1_ref[ref_main_idx]

kernel_8_rows:
    asr         lr,lr,#8                    @(ii)
    vdup.8      d31,d4[0]
    subs        r4,r4,#8

    vld1.8      {d8},[r10],r11              @(i)ref_main_idx
    vsub.u8     d24,d1,d25                  @(viii)32-fract(dup_const_32_fract)
    and         r9,lr,#0xff                 @(ii)
    addle       r6,r6,#8                    @increment the row value

    vld1.8      {d9},[r10]                  @(i)ref_main_idx_1
    vmull.u8    q11,d20,d24                 @(viii)vmull_u8(ref_main_idx, dup_const_32_fract)
    add         r12,r8,r9                   @(ii)*pu1_ref[ref_main_idx]

    vld1.8      {d5},[r6]                   @loads the row value
    vmlal.u8    q11,d21,d25                 @(viii)vmull_u8(ref_main_idx_1, dup_const_fract)
    asr         lr,lr,#8                    @(iii)

    vdup.8      d29,d4[1]                   @(ii)
    vrshrn.i16  d18,q9,#5                   @(vii)shift_res = vrshrn_n_u16(add_res, 5)
    and         r9,lr,#0xff                 @(iii)

    vst1.8      {d14},[r0],r3               @(vi)
    vsub.u8     d30,d1,d31                  @(i)32-fract(dup_const_32_fract)
    add         r10,r8,r9                   @(iii)*pu1_ref[ref_main_idx]

    vld1.8      {d12},[r12],r11             @(ii)ref_main_idx
    vmull.u8    q5,d8,d30                   @(i)vmull_u8(ref_main_idx, dup_const_32_fract)
    asr         lr,lr,#8                    @(iv)

    vld1.8      {d13},[r12]                 @(ii)ref_main_idx_1
    vmlal.u8    q5,d9,d31                   @(i)vmull_u8(ref_main_idx_1, dup_const_fract)
    and         r9,lr,#0xff                 @(iv)

    vmov.u32    lr,d3[1]                    @extract idx to the r register
    vrshrn.i16  d22,q11,#5                  @(viii)shift_res = vrshrn_n_u16(add_res, 5)

    vdup.8      d27,d4[2]                   @(iii)
    vsub.u8     d28,d1,d29                  @(ii)32-fract(dup_const_32_fract)
    movle       r4,r5                       @reload nt

    vld1.8      {d16},[r10],r11             @(iii)ref_main_idx
    vmull.u8    q7,d12,d28                  @(ii)vmull_u8(ref_main_idx, dup_const_32_fract)
    add         r12,r8,r9                   @(iv)*pu1_ref[ref_main_idx]

    vst1.8      {d18},[r0],r3               @(vii)
    vmlal.u8    q7,d13,d29                  @(ii)vmull_u8(ref_main_idx_1, dup_const_fract)

    vld1.8      {d17},[r10]                 @(iii)ref_main_idx_1
    vrshrn.i16  d10,q5,#5                   @(i)shift_res = vrshrn_n_u16(add_res, 5)

    vdup.8      d25,d4[3]                   @(iv)
    vmull.u8    q1,d5,d0                    @pos = ((row + 1) * intra_pred_ang)

    vst1.8      {d22},[r0]                  @(viii)
    vsub.u8     d26,d1,d27                  @(iii)32-fract(dup_const_32_fract)

    vld1.8      {d20},[r12],r11             @(iv)ref_main_idx
    vmull.u8    q9,d16,d26                  @(iii)vmull_u8(ref_main_idx, dup_const_32_fract)
    lsl         lr,lr,#1

    vld1.8      {d21},[r12]                 @(iv)ref_main_idx_1
    vmlal.u8    q9,d17,d27                  @(iii)vmull_u8(ref_main_idx_1, dup_const_fract)
    add         r0,r2,r3

    vdup.8      d31,d4[4]                   @(v)
    vrshrn.i16  d14,q7,#5                   @(ii)shift_res = vrshrn_n_u16(add_res, 5)
    and         r9,lr,#0xff                 @(v)

    vst1.8      {d10},[r2]!                 @(i)
    vsub.u8     d24,d1,d25                  @(iv)32-fract(dup_const_32_fract)
    add         r10,r8,r9                   @(v)*pu1_ref[ref_main_idx]

    vdup.8      d29,d4[5]                   @(vi)
    vmull.u8    q11,d20,d24                 @(iv)vmull_u8(ref_main_idx, dup_const_32_fract)
    asr         lr,lr,#8                    @(vi)

    vdup.8      d27,d4[6]                   @(vii)
    vmlal.u8    q11,d21,d25                 @(iv)vmull_u8(ref_main_idx_1, dup_const_fract)
    and         r9,lr,#0xff                 @(vi)

    vdup.8      d25,d4[7]                   @(viii)
    vrshrn.i16  d18,q9,#5                   @(iii)shift_res = vrshrn_n_u16(add_res, 5)
    add         r12,r8,r9                   @(vi)*pu1_ref[ref_main_idx]

    vld1.8      {d8},[r10],r11              @(v)ref_main_idx
    vand        q2,q1,q3                    @dup_const_fract(fract = pos & (31))
    asr         lr,lr,#8                    @(vii)

    vld1.8      {d9},[r10]                  @(v)ref_main_idx_1
    vshrn.u16   d3,q1,#5                    @idx = pos >> 5
    and         r9,lr,#0xff                 @(vii)

    vst1.8      {d14},[r0],r3               @(ii)
    vrshrn.i16  d22,q11,#5                  @(iv)shift_res = vrshrn_n_u16(add_res, 5)
    asr         lr,lr,#8                    @(viii)

    vld1.8      {d12},[r12],r11             @(vi)ref_main_idx
    vsub.u8     d30,d1,d31                  @(v)32-fract(dup_const_32_fract)
    add         r10,r8,r9                   @(vii)*pu1_ref[ref_main_idx]

    vld1.8      {d13},[r12]                 @(vi)ref_main_idx_1
    vmull.u8    q5,d8,d30                   @(v)vmull_u8(ref_main_idx, dup_const_32_fract)
    and         r9,lr,#0xff                 @(viii)

    vmov.u32    lr,d3[0]                    @(i)extract idx to the r register
    vmlal.u8    q5,d9,d31                   @(v)vmull_u8(ref_main_idx_1, dup_const_fract)
    add         r12,r8,r9                   @(viii)*pu1_ref[ref_main_idx]

    vld1.8      {d16},[r10],r11             @(vii)ref_main_idx
    vsub.u8     d28,d1,d29                  @(vi)32-fract(dup_const_32_fract)

    vst1.8      {d18},[r0],r3               @(iii)
    vmull.u8    q7,d12,d28                  @(vi)vmull_u8(ref_main_idx, dup_const_32_fract)
    movle       r8,r1                       @reload the source to pu1_src+2nt

    vld1.8      {d17},[r10]                 @(vii)ref_main_idx_1
    vmlal.u8    q7,d13,d29                  @(vi)vmull_u8(ref_main_idx_1, dup_const_fract)
    addgt       r8,r8,#8                    @increment the source next set 8 columns in same row

    vld1.8      {d20},[r12],r11             @(viii)ref_main_idx
    vrshrn.i16  d10,q5,#5                   @(v)shift_res = vrshrn_n_u16(add_res, 5)

    vld1.8      {d21},[r12]                 @(viii)ref_main_idx_1
    vsub.u8     d26,d1,d27                  @(vii)32-fract(dup_const_32_fract)
    lslle       r12,r3,#3

    vst1.8      {d22},[r0],r3               @(iv)
    vmull.u8    q9,d16,d26                  @(vii)vmull_u8(ref_main_idx, dup_const_32_fract)
    suble       r12,r12,r5

    vst1.8      {d10},[r0],r3               @(v)
    vmlal.u8    q9,d17,d27                  @(vii)vmull_u8(ref_main_idx_1, dup_const_fract)
    addle       r2,r2,r12                   @increment the dst pointer to 8*dst_strd - nt

    vmovn.i16   d4,q2
    vrshrn.i16  d14,q7,#5                   @(vi)shift_res = vrshrn_n_u16(add_res, 5)
    lsl         lr,lr,#1

    and         r9,lr,#0xff                 @(i)
    subs        r7,r7,#8
    add         r10,r8,r9                   @(i)*pu1_ref[ref_main_idx]

    bne         kernel_8_rows

epilogue:
    vst1.8      {d14},[r0],r3               @(vi)
    vrshrn.i16  d18,q9,#5                   @(vii)shift_res = vrshrn_n_u16(add_res, 5)

    vsub.u8     d24,d1,d25                  @(viii)32-fract(dup_const_32_fract)
    vmull.u8    q11,d20,d24                 @(viii)vmull_u8(ref_main_idx, dup_const_32_fract)
    vmlal.u8    q11,d21,d25                 @(viii)vmull_u8(ref_main_idx_1, dup_const_fract)

    vst1.8      {d18},[r0],r3               @(vii)
    vrshrn.i16  d22,q11,#5                  @(viii)shift_res = vrshrn_n_u16(add_res, 5)

    vst1.8      {d22},[r0],r3               @(viii)
    b           end_loops

core_loop_4:
    add         r10,r8,#2                   @pu1_ref_main_idx += (four_nt + 1)
    add         r11,r8,#4                   @pu1_ref_main_idx_1 += (four_nt + 2)
    mov         r8,#0

    add         r5,r8,#1                    @row + 1
    mul         r5,r5,r9                    @pos = ((row + 1) * intra_pred_ang)
    and         r5,r5,#31                   @fract = pos & (31)
    cmp         lr,r5                       @if(fract_prev > fract)
    addgt       r10,r10,#2                  @pu1_ref_main_idx += 2
    add         r11,r10,#2                  @pu1_ref_main_idx_1 += 2
    vdup.8      d0,r5                       @dup_const_fract
    rsb         r4,r5,#32
    vdup.8      d1,r4                       @dup_const_32_fract

@inner_loop_4
    vld1.8      {d2},[r10]                  @ref_main_idx
    add         r8,r8,#1
    mov         lr,r5                       @fract_prev = fract

    vld1.8      {d3},[r11]                  @ref_main_idx_1
    add         r5,r8,#1                    @row + 1
    mul         r5,r5,r9                    @pos = ((row + 1) * intra_pred_ang)
    and         r5,r5,#31                   @fract = pos & (31)
    cmp         lr,r5                       @if(fract_prev > fract)
    addgt       r10,r10,#2                  @pu1_ref_main_idx += 1
    add         r11,r10,#2                  @pu1_ref_main_idx_1 += 1

    vdup.8      d6,r5                       @dup_const_fract
    vmull.u8    q2,d2,d1                    @vmull_u8(ref_main_idx, dup_const_32_fract)

    rsb         r4,r5,#32
    vdup.8      d7,r4                       @dup_const_32_fract
    vmlal.u8    q2,d3,d0                    @vmull_u8(ref_main_idx_1, dup_const_fract)

    vld1.8      {d8},[r10]                  @ref_main_idx
    add         r8,r8,#1

    vld1.8      {d9},[r11]                  @ref_main_idx_1
    vrshrn.i16  d4,q2,#5                    @shift_res = vrshrn_n_u16(add_res, 5)

    mov         lr,r5                       @fract_prev = fract
    add         r5,r8,#1                    @row + 1
    mul         r5,r5,r9                    @pos = ((row + 1) * intra_pred_ang)
    and         r5,r5,#31                   @fract = pos & (31)
    cmp         lr,r5                       @if(fract_prev > fract)
    addgt       r10,r10,#2                  @pu1_ref_main_idx += 1
    add         r11,r10,#2                  @pu1_ref_main_idx_1 += 1

    vdup.8      d12,r5                      @dup_const_fract
    vmull.u8    q5,d8,d7                    @vmull_u8(ref_main_idx, dup_const_32_fract)

    rsb         r4,r5,#32
    vdup.8      d13,r4                      @dup_const_32_fract
    vmlal.u8    q5,d9,d6                    @vmull_u8(ref_main_idx_1, dup_const_fract)

    vld1.8      {d14},[r10]                 @ref_main_idx
    add         r8,r8,#1

    vst1.8      {d4},[r2],r3
    vrshrn.i16  d10,q5,#5                   @shift_res = vrshrn_n_u16(add_res, 5)

    vld1.8      {d15},[r11]                 @ref_main_idx_1
    mov         lr,r5                       @fract_prev = fract
    add         r5,r8,#1                    @row + 1
    mul         r5,r5,r9                    @pos = ((row + 1) * intra_pred_ang)
    and         r5,r5,#31                   @fract = pos & (31)
    cmp         lr,r5                       @if(fract_prev > fract)
    addgt       r10,r10,#2                  @pu1_ref_main_idx += 1
    add         r11,r10,#2                  @pu1_ref_main_idx_1 += 1

    vdup.8      d18,r5                      @dup_const_fract
    vmull.u8    q8,d14,d13                  @vmull_u8(ref_main_idx, dup_const_32_fract)

    rsb         r4,r5,#32
    vdup.8      d19,r4                      @dup_const_32_fract
    vmlal.u8    q8,d15,d12                  @vmull_u8(ref_main_idx_1, dup_const_fract)

    vld1.8      {d20},[r10]                 @ref_main_idx

    vst1.8      {d10},[r2],r3
    vrshrn.i16  d16,q8,#5                   @shift_res = vrshrn_n_u16(add_res, 5)
    vld1.8      {d21},[r11]                 @ref_main_idx_1

    vmull.u8    q11,d20,d19                 @vmull_u8(ref_main_idx, dup_const_32_fract)
    vmlal.u8    q11,d21,d18                 @vmull_u8(ref_main_idx_1, dup_const_fract)

    vst1.8      {d16},[r2],r3
    vrshrn.i16  d22,q11,#5                  @shift_res = vrshrn_n_u16(add_res, 5)

    vst1.8      {d22},[r2],r3

end_loops:
    ldmfd       sp!,{r4-r12,r15}            @reload the registers from sp