//******************************************************************************
//*
//* Copyright (C) 2015 The Android Open Source Project
//*
//* 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.
//*
//*****************************************************************************
//* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
//*/
//******************************************************************************
//*
//* @brief
//* This file contains definitions of routines for spatial filter
//*
//* @author
//* Ittiam
//*
//* @par List of Functions:
//* - ideint_cac_8x8_av8()
//*
//* @remarks
//* None
//*
//*******************************************************************************
//******************************************************************************
//*
//* @brief Calculates Combing Artifact
//*
//* @par Description
//* This functions calculates combing artifact check (CAC) for given two fields
//*
//* @param[in] pu1_top
//* UWORD8 pointer to top field
//*
//* @param[in] pu1_bot
//* UWORD8 pointer to bottom field
//*
//* @param[in] top_strd
//* Top field stride
//*
//* @param[in] bot_strd
//* Bottom field stride
//*
//* @returns
//* None
//*
//* @remarks
//*
//******************************************************************************
.global ideint_cac_8x8_av8
ideint_cac_8x8_av8:
// Load first row of top
ld1 {v28.8b}, [x0], x2
// Load first row of bottom
ld1 {v29.8b}, [x1], x3
mov v28.d[1], v29.d[0]
// Load second row of top
ld1 {v30.8b}, [x0], x2
// Load second row of bottom
ld1 {v31.8b}, [x1], x3
mov v30.d[1], v31.d[0]
// Calculate row based adj and alt values
// Get row sums
uaddlp v0.8h, v28.16b
uaddlp v2.8h, v30.16b
uaddlp v0.4s, v0.8h
uaddlp v2.4s, v2.8h
// Both v0 and v2 have four 32 bit sums corresponding to first 4 rows
// Pack v0 and v2 into a single register (sum does not exceed 16bits)
shl v16.4s, v2.4s, #16
orr v16.16b, v0.16b, v16.16b
// v16 now contains 8 sums
// Load third row of top
ld1 {v24.8b}, [x0], x2
// Load third row of bottom
ld1 {v25.8b}, [x1], x3
mov v24.d[1], v25.d[0]
// Load fourth row of top
ld1 {v26.8b}, [x0], x2
// Load fourth row of bottom
ld1 {v27.8b}, [x1], x3
mov v26.d[1], v27.d[0]
// Get row sums
uaddlp v4.8h, v24.16b
uaddlp v6.8h, v26.16b
uaddlp v4.4s, v4.8h
uaddlp v6.4s, v6.8h
// Both v4 and v6 have four 32 bit sums corresponding to last 4 rows
// Pack v4 and v6 into a single register (sum does not exceed 16bits)
shl v18.4s, v6.4s, #16
orr v18.16b, v4.16b, v18.16b
// v18 now contains 8 sums
// Compute absolute diff between top and bottom row sums
mov v17.d[0], v16.d[1]
uabd v16.4h, v16.4h, v17.4h
mov v19.d[0], v18.d[1]
uabd v17.4h, v18.4h, v19.4h
mov v16.d[1], v17.d[0]
// RSUM_CSUM_THRESH
movi v18.8h, #20
// Eliminate values smaller than RSUM_CSUM_THRESH
cmhs v20.8h, v16.8h, v18.8h
and v20.16b, v16.16b, v20.16b
// v20 now contains 8 absolute diff of sums above the threshold
// Compute adj
mov v21.d[0], v20.d[1]
add v20.4h, v20.4h, v21.4h
// v20 has four adj values for two sub-blocks
// Compute alt
uabd v0.4s, v0.4s, v2.4s
uabd v4.4s, v4.4s, v6.4s
add v0.4s, v0.4s, v4.4s
mov v1.d[0], v0.d[1]
add v21.4s, v0.4s, v1.4s
// d21 has two values for two sub-blocks
// Calculate column based adj and alt values
urhadd v0.16b, v28.16b, v30.16b
urhadd v2.16b, v24.16b, v26.16b
urhadd v0.16b, v0.16b, v2.16b
mov v1.d[0], v0.d[1]
uabd v0.8b, v0.8b, v1.8b
// RSUM_CSUM_THRESH >> 2
movi v22.16b, #5
// Eliminate values smaller than RSUM_CSUM_THRESH >> 2
cmhs v1.16b, v0.16b, v22.16b
and v0.16b, v0.16b, v1.16b
// d0 now contains 8 absolute diff of sums above the threshold
uaddlp v0.4h, v0.8b
shl v0.4h, v0.4h,#2
// Add row based adj
add v20.4h, v0.4h, v20.4h
uaddlp v20.2s, v20.4h
// d20 now contains 2 adj values
urhadd v0.8b, v28.8b, v29.8b
urhadd v2.8b, v24.8b, v25.8b
urhadd v0.8b, v0.8b, v2.8b
urhadd v1.8b, v30.8b, v31.8b
urhadd v3.8b, v26.8b, v27.8b
urhadd v1.8b, v1.8b, v3.8b
uabd v0.8b, v0.8b, v1.8b
uaddlp v0.4h, v0.8b
shl v0.4h, v0.4h, #2
uaddlp v0.2s, v0.4h
add v21.2s, v0.2s, v21.2s
// d21 now contains 2 alt values
// SAD_BIAS_MULT_SHIFT
ushr v0.2s, v21.2s, #3
add v21.2s, v21.2s, v0.2s
// SAD_BIAS_ADDITIVE >> 1
movi v0.2s, #4
add v21.2s, v21.2s, v0.2s
cmhi v0.2s, v20.2s, v21.2s
uaddlp v0.1d, v0.2s
smov x0, v0.2s[0]
cmp x0, #0
mov x4, #1
csel x0, x4, x0, ne
ret