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246 lines
9.0 KiB
246 lines
9.0 KiB
///*****************************************************************************
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//*
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//* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
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//*
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//* Licensed under the Apache License, Version 2.0 (the "License");
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//* you may not use this file except in compliance with the License.
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//* You may obtain a copy of the License at:
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//*
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//* http://www.apache.org/licenses/LICENSE-2.0
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//*
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//* Unless required by applicable law or agreed to in writing, software
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//* distributed under the License is distributed on an "AS IS" BASIS,
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//* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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//* See the License for the specific language governing permissions and
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//* limitations under the License.
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//*
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//*****************************************************************************/
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///**
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//*******************************************************************************
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//* @file
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//* ihevc_weighted_pred_uni.s
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//*
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//* @brief
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//* contains function definitions for weighted prediction used in inter
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//* prediction
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//*
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//* @author
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//* parthiban v
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//*
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//* @par list of functions:
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//* - ihevc_weighted_pred_uni()
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//*
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//* @remarks
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//* none
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//*
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//*******************************************************************************
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//*/
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///**
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//*******************************************************************************
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//*
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//* @brief
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//* does uni-weighted prediction on the array pointed by pi2_src and stores
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//* it at the location pointed by pi2_dst assumptions : the function is
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//* optimized considering the fact width and height are multiple of 2.
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//*
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//* @par description:
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//* dst = ( (src + lvl_shift) * wgt0 + (1 << (shift - 1)) ) >> shift +
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//* offset
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//*
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//* @param[in] pi2_src
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//* pointer to the source
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//*
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//* @param[out] pu1_dst
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//* pointer to the destination
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//*
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//* @param[in] src_strd
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//* source stride
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//*
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//* @param[in] dst_strd
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//* destination stride
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//*
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//* @param[in] wgt0
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//* weight to be multiplied to the source
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//*
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//* @param[in] off0
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//* offset to be added after rounding and
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//*
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//* @param[in] shifting
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//*
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//*
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//* @param[in] shift
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//* (14 bit depth) + log2_weight_denominator
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//*
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//* @param[in] lvl_shift
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//* added before shift and offset
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//*
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//* @param[in] ht
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//* height of the source
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//*
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//* @param[in] wd
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//* width of the source
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//*
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//* @returns
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//*
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//* @remarks
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//* none
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//*
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//*******************************************************************************
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//*/
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//void ihevc_weighted_pred_uni(word16 *pi2_src,
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// uword8 *pu1_dst,
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// word32 src_strd,
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// word32 dst_strd,
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// word32 wgt0,
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// word32 off0,
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// word32 shift,
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// word32 lvl_shift,
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// word32 ht,
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// word32 wd)
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//**************variables vs registers*****************************************
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// x0 => *pi2_src
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// x1 => *pu1_dst
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// x2 => src_strd
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// x3 => dst_strd
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// x4 => wgt0
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// x5 => off0
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// x6 => shift
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// x7 => lvl_shift
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// x8 => ht
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// x9 => wd
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.text
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.align 4
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.include "ihevc_neon_macros.s"
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.globl ihevc_weighted_pred_uni_av8
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.type ihevc_weighted_pred_uni_av8, %function
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ihevc_weighted_pred_uni_av8:
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// stmfd sp!, {x4-x12, x14} //stack stores the values of the arguments
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ldr w8,[sp,#0]
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ldr w9,[sp,#8]
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// stmfd sp!, {x4-x12, x14} //stack stores the values of the arguments
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stp x19, x20,[sp,#-16]!
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stp x21, x22,[sp,#-16]!
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mov x15,x4 // src_strd2 40
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mov x16,x5 // dst_strd 44
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mov x17,x6 // lvl_shift1 48
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mov x19,x7 // lvl_shift2 52
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mov x20,x8 // ht 56
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mov x21,x9 // wd 60
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mov x4,x15 //load wgt0
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mov x7,x19 //load lvl_shift
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mov x11,#1
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mov x5,x16 //load off0
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mul x10, x7, x4 //lvl_shift * wgt0
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mov x6,x17 //load shift
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mov x8,x20 //load ht
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lsl x22,x5,x6
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add x10,x10,x22 //lvl_shift * wgt0 + (off0 << shift)
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mov x9,x21 //load wt
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sub x12,x6,#1
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mov v0.h[0], w4 //moved for scalar multiplication
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lsl x2,x2,#1
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dup v28.4s,w6 //vmovq_n_s32(tmp_shift)
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lsl x22,x11,x12
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add x10,x10,x22 //tmp_lvl_shift += (1 << (shift - 1))
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dup v30.4s,w10 //vmovq_n_s32(tmp_lvl_shift)
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neg v28.4s, v28.4s
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lsl x4,x9,#1
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cmp x8,#0 //check ht == 0
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beq end_loops //if equal, then end the function
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outer_loop:
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cmp x9,#0 //check wd == 0
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beq end_loops //if equal, then end the function
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core_loop:
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add x5,x0,x2 //pi2_src_tmp1 = pi2_src1 + 2*src_strd1(2* because pi1_src is a 16 bit pointer)
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add x6,x1,x3 //pu1_dst_tmp = pu1_dst + dst_strd
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ld1 {v1.4h},[x0],#8 //load and increment the pi2_src
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ld1 {v2.4h},[x5],x2 //load and increment the pi2_src_tmp ii iteration
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smull v4.4s, v1.4h, v0.h[0] //vmull_n_s16(pi2_src_val1, (int16_t) wgt0)
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add v4.4s, v4.4s , v30.4s //vaddq_s32(i4_tmp1_t, tmp_lvl_shift_t)
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ld1 {v3.4h},[x5],x2 //load and increment the pi2_src iii iteration
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smull v6.4s, v2.4h, v0.h[0] //vmull_n_s16(pi2_src_val2, (int16_t) wgt0) ii iteration
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ld1 {v5.4h},[x5],x2 //load and increment the pi2_src_tmp iv iteration
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sshl v4.4s,v4.4s,v28.4s
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//vshl.s32 q2,q2,q14 //vshlq_s32(i4_tmp1_t, tmp_shift_t)
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add v6.4s, v6.4s , v30.4s //vaddq_s32(i4_tmp2_t, tmp_lvl_shift_t) ii iteration
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smull v7.4s, v3.4h, v0.h[0] //vmull_n_s16(pi2_src_val1, (int16_t) wgt0) iii iteration
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sqxtun v4.4h, v4.4s //vqmovun_s32(sto_res_tmp1)
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add v7.4s, v7.4s , v30.4s //vaddq_s32(i4_tmp1_t, tmp_lvl_shift_t) iii iteration
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//mov v5, v4 //vcombine_u16(sto_res_tmp2, sto_res_tmp2)
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sshl v6.4s,v6.4s,v28.4s
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//vshl.s32 q3,q3,q14 //vshlq_s32(i4_tmp2_t, tmp_shift_t) ii iteration
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smull v16.4s, v5.4h, v0.h[0] //vmull_n_s16(pi2_src_val2, (int16_t) wgt0) iv iteration
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uqxtn v4.8b, v4.8h //vqmovn_u16(sto_res_tmp3)
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sshl v7.4s,v7.4s,v28.4s
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//vshl.s32 q5,q5,q14 //vshlq_s32(i4_tmp1_t, tmp_shift_t) iii iteration
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sqxtun v6.4h, v6.4s //vqmovun_s32(sto_res_tmp1) ii iteration
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add v16.4s, v16.4s , v30.4s //vaddq_s32(i4_tmp2_t, tmp_lvl_shift_t) iv iteration
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//mov v7, v6 //vcombine_u16(sto_res_tmp2, sto_res_tmp2) ii iteration
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sqxtun v7.4h, v7.4s //vqmovun_s32(sto_res_tmp1) iii iteration
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sshl v16.4s,v16.4s,v28.4s
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//vshl.s32 q6,q6,q14 //vshlq_s32(i4_tmp2_t, tmp_shift_t) iv iteration
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st1 {v4.s}[0],[x1],#4 //store pu1_dst i iteration
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//mov v11, v10 //vcombine_u16(sto_res_tmp2, sto_res_tmp2) iii iteration
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uqxtn v6.8b, v6.8h //vqmovn_u16(sto_res_tmp3) ii iteration
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st1 {v6.s}[0],[x6],x3 //store pu1_dst ii iteration
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uqxtn v7.8b, v7.8h //vqmovn_u16(sto_res_tmp3) iii iteration
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sqxtun v16.4h, v16.4s //vqmovun_s32(sto_res_tmp1) iv iteration
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//mov v13, v12 //vcombine_u16(sto_res_tmp2, sto_res_tmp2) iv iteration
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st1 {v7.s}[0],[x6],x3 //store pu1_dst i iteration iii iteration
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uqxtn v16.8b, v16.8h //vqmovn_u16(sto_res_tmp3) iv iteration
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subs x9,x9,#4 //decrement wd by 4 and check for 0
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st1 {v16.s}[0],[x6],x3 //store pu1_dst iv iteration
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bgt core_loop //if greater than 0 repeat the core loop again
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end_core_loop:
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sub x22,x4,x2,lsl #2 //2*src_strd - wd
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neg x11, x22
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subs x8,x8,#4 //decrement the ht by 4
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add x0,x0,x11 //pi2_src + 4*src_strd - 2*wd(since pi2_src is 16 bit pointer double the increment with double the wd decrement)
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asr x9,x4,#1
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sub x22,x9,x3,lsl #2 //2*dst_strd - wd
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neg x12, x22
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add x1,x1,x12 //pu1_dst + dst_std - wd
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bgt core_loop //if ht is greater than 0 goto outer_loop
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end_loops:
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// ldmfd sp!,{x4-x12,x15} //reload the registers from sp
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ldp x21, x22,[sp],#16
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ldp x19, x20,[sp],#16
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ret
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