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      1 //******************************************************************************
      2 //*
      3 //* Copyright (C) 2015 The Android Open Source Project
      4 //*
      5 //* Licensed under the Apache License, Version 2.0 (the "License");
      6 //* you may not use this file except in compliance with the License.
      7 //* You may obtain a copy of the License at:
      8 //*
      9 //* http://www.apache.org/licenses/LICENSE-2.0
     10 //*
     11 //* Unless required by applicable law or agreed to in writing, software
     12 //* distributed under the License is distributed on an "AS IS" BASIS,
     13 //* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 //* See the License for the specific language governing permissions and
     15 //* limitations under the License.
     16 //*
     17 //*****************************************************************************
     18 //* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
     19 //*/
     20 
     21 
     22 //******************************************************************************
     23 //*
     24 //*
     25 //* @brief
     26 //*  This file contains definitions of routines for SAD caclulation
     27 //*
     28 //* @author
     29 //*  Ittiam
     30 //*
     31 //* @par List of Functions:
     32 //*  - icv_sad_8x4_av8()
     33 //*
     34 //* @remarks
     35 //*  None
     36 //*
     37 //*******************************************************************************
     38 
     39 
     40 //******************************************************************************
     41 //*
     42 //*  @brief computes distortion (SAD) between 2 8x4  blocks
     43 //*
     44 //*
     45 //*  @par   Description
     46 //*   This functions computes SAD between 2 8x4 blocks.
     47 //*
     48 //* @param[in] pu1_src
     49 //*  UWORD8 pointer to the source
     50 //*
     51 //* @param[out] pu1_ref
     52 //*  UWORD8 pointer to the reference buffer
     53 //*
     54 //* @param[in] src_strd
     55 //*  integer source stride
     56 //*
     57 //* @param[in] ref_strd
     58 //*  integer reference stride
     59 //*
     60 //* @param[in] wd
     61 //*  Width (assumed to be 8)
     62 //*
     63 //* @param[in] ht
     64 //*  Height (assumed to be 4)
     65 //*
     66 //* @returns
     67 //*     SAD value in r0
     68 //*
     69 //* @remarks
     70 //*
     71 //******************************************************************************
     72 
     73     .global icv_sad_8x4_av8
     74 
     75 icv_sad_8x4_av8:
     76 
     77     // Load 8x4 source
     78     ld1     {v0.8b},    [x0],     x2
     79     ld1     {v1.8b},    [x0],     x2
     80     ld1     {v2.8b},    [x0],     x2
     81     ld1     {v3.8b},    [x0],     x2
     82 
     83     // Load 8x4 reference
     84     ld1     {v4.8b},    [x1],     x3
     85     ld1     {v5.8b},    [x1],     x3
     86     ld1     {v6.8b},    [x1],     x3
     87     ld1     {v7.8b},    [x1],     x3
     88 
     89     uabdl   v0.8h,      v0.8b,      v4.8b
     90     uabal   v0.8h,      v1.8b,      v5.8b
     91     uabal   v0.8h,      v2.8b,      v6.8b
     92     uabal   v0.8h,      v3.8b,      v7.8b
     93 
     94     addp    v0.8h,      v0.8h,      v0.8h
     95     addp    v0.8h,      v0.8h,      v0.8h
     96     addp    v0.8h,      v0.8h,      v0.8h
     97 
     98     smov    x0,         v0.8h[0]
     99 
    100     ret
    101