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119 lines
3.1 KiB
119 lines
3.1 KiB
7 months ago
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//******************************************************************************
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//*
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//* Copyright (C) 2015 The Android Open Source Project
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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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//* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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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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//* This file contains definitions of routines for variance caclulation
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//*
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//* @author
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//* Ittiam
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//*
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//* @par List of Functions:
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//* - icv_variance_8x4_av8()
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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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//* @brief computes variance of a 8x4 block
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//*
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//*
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//* @par Description
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//* This functions computes variance of a 8x4 block
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//*
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//* @param[in] pu1_src
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//* UWORD8 pointer to the source
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//*
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//* @param[in] src_strd
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//* integer source stride
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//*
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//* @param[in] wd
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//* Width (assumed to be 8)
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//*
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//* @param[in] ht
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//* Height (assumed to be 4)
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//*
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//* @returns
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//* variance value in x0
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//*
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//* @remarks
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//*
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//******************************************************************************
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.global icv_variance_8x4_av8
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icv_variance_8x4_av8:
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// Load 8x4 source
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ld1 {v0.8b}, [x0], x1
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ld1 {v1.8b}, [x0], x1
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ld1 {v2.8b}, [x0], x1
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ld1 {v3.8b}, [x0], x1
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// Calculate Sum(values)
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uaddl v4.8h, v0.8b, v1.8b
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uaddl v6.8h, v2.8b, v3.8b
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add v4.8h, v4.8h, v6.8h
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addp v4.8h, v4.8h, v4.8h
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addp v4.4h, v4.4h, v4.4h
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addp v4.4h, v4.4h, v4.4h
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// Calculate SumOfSquares
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umull v20.8h, v0.8b, v0.8b
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umull v22.8h, v1.8b, v1.8b
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umull v24.8h, v2.8b, v2.8b
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umull v26.8h, v3.8b, v3.8b
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uaddl v21.4s, v20.4h, v22.4h
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uaddl v25.4s, v24.4h, v26.4h
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uaddl2 v20.4s, v20.8h, v22.8h
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uaddl2 v24.4s, v24.8h, v26.8h
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add v20.4s, v20.4s, v21.4s
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add v22.4s, v24.4s, v25.4s
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add v20.4s, v20.4s, v22.4s
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addp v20.4s, v20.4s, v20.4s
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addp v20.2s, v20.2s, v20.2s
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// Sum(values)
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smov x0, v4.h[0]
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// SumOfSquares
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smov x1, v20.s[0]
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// SquareOfSums
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mul x3, x0, x0
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// SumOfSquares * 8 * 4 - SquareOfSums
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sub x1, x3, x1, LSL #5
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neg x0, x1
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// Divide by 32 * 32
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ASR x0, x0, #10
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ret
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