//******************************************************************************
//*
//* 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
//*/
///**
//******************************************************************************
//* @file
//* ih264_default_weighted_pred_av8.s
//*
//* @brief
//* Contains function definitions for default weighted prediction.
//*
//* @author
//* Kaushik Senthoor R
//*
//* @par List of Functions:
//*
//* - ih264_default_weighted_pred_luma_av8()
//* - ih264_default_weighted_pred_chroma_av8()
//*
//* @remarks
//* None
//*
//*******************************************************************************
//*/
//*******************************************************************************
//* @function
//* ih264_default_weighted_pred_luma_av8()
//*
//* @brief
//* This routine performs the default weighted prediction as described in sec
//* 8.4.2.3.1 titled "Default weighted sample prediction process" for luma.
//*
//* @par Description:
//* This function gets two ht x wd blocks, calculates their rounded-average and
//* stores it in the destination block.
//*
//* @param[in] puc_src1:
//* UWORD8 Pointer to the buffer containing the first input block.
//*
//* @param[in] puc_src2:
//* UWORD8 Pointer to the buffer containing the second input block.
//*
//* @param[out] puc_dst
//* UWORD8 pointer to the destination where the output block is stored.
//*
//* @param[in] src_strd1
//* Stride of the first input buffer
//*
//* @param[in] src_strd2
//* Stride of the second input buffer
//*
//* @param[in] dst_strd
//* Stride of the destination buffer
//*
//* @param[in] ht
//* integer height of the array
//*
//* @param[in] wd
//* integer width of the array
//*
//* @returns
//* None
//*
//* @remarks
//* (ht,wd) can be (4,4), (4,8), (8,4), (8,8), (8,16), (16,8) or (16,16).
//*
//*******************************************************************************
//*/
//void ih264_default_weighted_pred_luma_av8(UWORD8 *puc_src1,
// UWORD8 *puc_src2,
// UWORD8 *puc_dst,
// WORD32 src_strd1,
// WORD32 src_strd2,
// WORD32 dst_strd,
// WORD32 ht,
// WORD32 wd)
//
//**************Variables Vs Registers*****************************************
// x0 => puc_src1
// x1 => puc_src2
// x2 => puc_dst
// w3 => src_strd1
// w4 => src_strd2
// w5 => dst_strd
// w6 => ht
// w7 => wd
//
.text
.p2align 2
.include "ih264_neon_macros.s"
.global ih264_default_weighted_pred_luma_av8
ih264_default_weighted_pred_luma_av8:
push_v_regs
stp x19, x20, [sp, #-16]!
sxtw x3, w3
sxtw x4, w4
sxtw x5, w5
cmp w7, #16
beq loop_16 //branch if wd is 16
cmp w7, #8
beq loop_8 //branch if wd is 8
loop_4: //each iteration processes four rows
ld1 {v0.s}[0], [x0], x3 //load row 1 in source 1
ld1 {v0.s}[1], [x0], x3 //load row 2 in source 1
ld1 {v2.s}[0], [x1], x4 //load row 1 in source 2
ld1 {v2.s}[1], [x1], x4 //load row 2 in source 2
ld1 {v1.s}[0], [x0], x3 //load row 3 in source 1
ld1 {v1.s}[1], [x0], x3 //load row 4 in source 1
urhadd v0.8b, v0.8b , v2.8b
ld1 {v3.s}[0], [x1], x4 //load row 3 in source 2
ld1 {v3.s}[1], [x1], x4 //load row 4 in source 2
subs w6, w6, #4 //decrement ht by 4
st1 {v0.s}[0], [x2], x5 //load row 1 in destination
st1 {v0.s}[1], [x2], x5 //load row 2 in destination
urhadd v1.8b, v1.8b , v3.8b
st1 {v1.s}[0], [x2], x5 //load row 3 in destination
st1 {v1.s}[1], [x2], x5 //load row 4 in destination
bgt loop_4 //if greater than 0 repeat the loop again
b end_loops
loop_8: //each iteration processes four rows
ld1 {v0.8b}, [x0], x3 //load row 1 in source 1
ld1 {v4.8b}, [x1], x4 //load row 1 in source 2
ld1 {v1.8b}, [x0], x3 //load row 2 in source 1
ld1 {v5.8b}, [x1], x4 //load row 2 in source 2
ld1 {v2.8b}, [x0], x3 //load row 3 in source 1
urhadd v0.16b, v0.16b , v4.16b
urhadd v1.16b, v1.16b , v5.16b
ld1 {v6.8b}, [x1], x4 //load row 3 in source 2
ld1 {v3.8b}, [x0], x3 //load row 4 in source 1
urhadd v2.8b, v2.8b , v6.8b
ld1 {v7.8b}, [x1], x4 //load row 4 in source 2
subs w6, w6, #4 //decrement ht by 4
st1 {v0.8b}, [x2], x5 //load row 1 in destination
urhadd v3.8b, v3.8b , v7.8b
st1 {v1.8b}, [x2], x5 //load row 2 in destination
st1 {v2.8b}, [x2], x5 //load row 3 in destination
st1 {v3.8b}, [x2], x5 //load row 4 in destination
bgt loop_8 //if greater than 0 repeat the loop again
b end_loops
loop_16: //each iteration processes eight rows
ld1 {v0.8b, v1.8b}, [x0], x3 //load row 1 in source 1
ld1 {v16.8b, v17.8b}, [x1], x4 //load row 1 in source 2
ld1 {v2.8b, v3.8b}, [x0], x3 //load row 2 in source 1
ld1 {v18.8b, v19.8b}, [x1], x4 //load row 2 in source 2
urhadd v0.16b, v0.16b , v16.16b
urhadd v1.16b, v1.16b , v17.16b
ld1 {v4.8b, v5.8b}, [x0], x3 //load row 3 in source 1
ld1 {v20.8b, v21.8b}, [x1], x4 //load row 3 in source 2
urhadd v2.16b, v2.16b , v18.16b
urhadd v3.16b, v3.16b , v19.16b
ld1 {v6.8b, v7.8b}, [x0], x3 //load row 4 in source 1
ld1 {v22.8b, v23.8b}, [x1], x4 //load row 4 in source 2
urhadd v4.16b, v4.16b , v20.16b
urhadd v5.16b, v5.16b , v21.16b
ld1 {v8.8b, v9.8b}, [x0], x3 //load row 5 in source 1
ld1 {v24.8b, v25.8b}, [x1], x4 //load row 5 in source 2
urhadd v6.16b, v6.16b , v22.16b
urhadd v7.16b, v7.16b , v23.16b
ld1 {v10.8b, v11.8b}, [x0], x3 //load row 6 in source 1
ld1 {v26.8b, v27.8b}, [x1], x4 //load row 6 in source 2
urhadd v8.16b, v8.16b , v24.16b
urhadd v9.16b, v9.16b , v25.16b
ld1 {v12.8b, v13.8b}, [x0], x3 //load row 7 in source 1
ld1 {v28.8b, v29.8b}, [x1], x4 //load row 7 in source 2
urhadd v10.16b, v10.16b , v26.16b
urhadd v11.16b, v11.16b , v27.16b
ld1 {v14.8b, v15.8b}, [x0], x3 //load row 8 in source 1
ld1 {v30.8b, v31.8b}, [x1], x4 //load row 8 in source 2
urhadd v12.16b, v12.16b , v28.16b
urhadd v13.16b, v13.16b , v29.16b
st1 {v0.8b, v1.8b}, [x2], x5 //load row 1 in destination
st1 {v2.8b, v3.8b}, [x2], x5 //load row 2 in destination
urhadd v14.16b, v14.16b , v30.16b
urhadd v15.16b, v15.16b , v31.16b
st1 {v4.8b, v5.8b}, [x2], x5 //load row 3 in destination
st1 {v6.8b, v7.8b}, [x2], x5 //load row 4 in destination
subs w6, w6, #8 //decrement ht by 8
st1 {v8.8b, v9.8b}, [x2], x5 //load row 5 in destination
st1 {v10.8b, v11.8b}, [x2], x5 //load row 6 in destination
st1 {v12.8b, v13.8b}, [x2], x5 //load row 7 in destination
st1 {v14.8b, v15.8b}, [x2], x5 //load row 8 in destination
bgt loop_16 //if greater than 0 repeat the loop again
end_loops:
// LDMFD sp!,{x4-x7,x15} //Reload the registers from sp
ldp x19, x20, [sp], #16
pop_v_regs
ret
//*******************************************************************************
//* @function
//* ih264_default_weighted_pred_chroma_av8()
//*
//* @brief
//* This routine performs the default weighted prediction as described in sec
//* 8.4.2.3.1 titled "Default weighted sample prediction process" for chroma.
//*
//* @par Description:
//* This function gets two ht x wd blocks, calculates their rounded-average and
//* stores it in the destination block for U and V.
//*
//* @param[in] puc_src1:
//* UWORD8 Pointer to the buffer containing the first input block.
//*
//* @param[in] puc_src2:
//* UWORD8 Pointer to the buffer containing the second input block.
//*
//* @param[out] puc_dst
//* UWORD8 pointer to the destination where the output block is stored.
//*
//* @param[in] src_strd1
//* Stride of the first input buffer
//*
//* @param[in] src_strd2
//* Stride of the second input buffer
//*
//* @param[in] dst_strd
//* Stride of the destination buffer
//*
//* @param[in] ht
//* integer height of the array
//*
//* @param[in] wd
//* integer width of the array
//*
//* @returns
//* None
//*
//* @remarks
//* (ht,wd) can be (2,2), (2,4), (4,2), (4,4), (4,8), (8,4) or (8,8).
//*
//*******************************************************************************
//*/
//void ih264_default_weighted_pred_chroma_av8(UWORD8 *puc_src1,
// UWORD8 *puc_src2,
// UWORD8 *puc_dst,
// WORD32 src_strd1,
// WORD32 src_strd2,
// WORD32 dst_strd,
// WORD32 ht,
// WORD32 wd)
//
//**************Variables Vs Registers*****************************************
// x0 => puc_src1
// x1 => puc_src2
// x2 => puc_dst
// w3 => src_strd1
// w4 => src_strd2
// w5 => dst_strd
// w6 => ht
// w7 => wd
//
.global ih264_default_weighted_pred_chroma_av8
ih264_default_weighted_pred_chroma_av8:
push_v_regs
stp x19, x20, [sp, #-16]!
sxtw x3, w3
sxtw x4, w4
sxtw x5, w5
cmp w7, #8
beq loop_8_uv //branch if wd is 8
cmp w7, #4
beq loop_4_uv //branch if wd is 4
loop_2_uv: //each iteration processes two rows
ld1 {v0.s}[0], [x0], x3 //load row 1 in source 1
ld1 {v0.s}[1], [x0], x3 //load row 2 in source 1
ld1 {v1.s}[0], [x1], x4 //load row 1 in source 2
ld1 {v1.s}[1], [x1], x4 //load row 2 in source 2
urhadd v0.8b, v0.8b , v1.8b
subs w6, w6, #2 //decrement ht by 2
st1 {v0.s}[0], [x2], x5 //load row 1 in destination
st1 {v0.s}[1], [x2], x5 //load row 2 in destination
bgt loop_2_uv //if greater than 0 repeat the loop again
b end_loops_uv
loop_4_uv: //each iteration processes two rows
ld1 {v0.8b}, [x0], x3 //load row 1 in source 1
ld1 {v2.8b}, [x1], x4 //load row 1 in source 2
ld1 {v1.8b}, [x0], x3 //load row 2 in source 1
urhadd v0.8b, v0.8b , v2.8b
ld1 {v3.8b}, [x1], x4 //load row 2 in source 2
urhadd v1.8b, v1.8b , v3.8b
st1 {v0.8b}, [x2], x5 //load row 1 in destination
subs w6, w6, #2 //decrement ht by 2
st1 {v1.8b}, [x2], x5 //load row 2 in destination
bgt loop_4_uv //if greater than 0 repeat the loop again
b end_loops_uv
loop_8_uv: //each iteration processes four rows
ld1 {v0.8b, v1.8b}, [x0], x3 //load row 1 in source 1
ld1 {v8.8b, v9.8b}, [x1], x4 //load row 1 in source 2
ld1 {v2.8b, v3.8b}, [x0], x3 //load row 2 in source 1
urhadd v0.16b, v0.16b , v8.16b
urhadd v1.16b, v1.16b , v9.16b
ld1 {v10.8b, v11.8b}, [x1], x4 //load row 2 in source 2
ld1 {v4.8b, v5.8b}, [x0], x3 //load row 3 in source 1
urhadd v2.16b, v2.16b , v10.16b
urhadd v3.16b, v3.16b , v11.16b
ld1 {v12.8b, v13.8b}, [x1], x4 //load row 3 in source 2
ld1 {v6.8b, v7.8b}, [x0], x3 //load row 4 in source 1
urhadd v4.16b, v4.16b , v12.16b
urhadd v5.16b, v5.16b , v13.16b
ld1 {v14.8b, v15.8b}, [x1], x4 //load row 4 in source 2
st1 {v0.8b, v1.8b}, [x2], x5 //load row 1 in destination
urhadd v6.16b, v6.16b , v14.16b
urhadd v7.16b, v7.16b , v15.16b
st1 {v2.8b, v3.8b}, [x2], x5 //load row 2 in destination
subs w6, w6, #4 //decrement ht by 4
st1 {v4.8b, v5.8b}, [x2], x5 //load row 3 in destination
st1 {v6.8b, v7.8b}, [x2], x5 //load row 4 in destination
bgt loop_8_uv //if greater than 0 repeat the loop again
end_loops_uv:
ldp x19, x20, [sp], #16
pop_v_regs
ret