//******************************************************************************
//*
//* 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_resi_trans_quant_av8.c
//*
//* @brief
//* contains function definitions for residual and forward trans
//*
//* @author
//* ittiam
//*
//* @par list of functions:
//* ih264_resi_trans_quant_4x4_av8
//* ih264_resi_trans_quant_8x8_av8
//* ih264_resi_trans_quant_chroma_4x4_av8
//* @remarks
//* none
//*
//*******************************************************************************
.include "ih264_neon_macros.s"
.text
.p2align 2
//*****************************************************************************
//*
//* function name : ih264_resi_trans_quant_4x4
//* description : this function does cf4 of h264
//*
//* arguments : x0 :pointer to src buffer
// x1 :pointer to pred buffer
// x2 :pointer to dst buffer
// x3 :source stride
// x4 :pred stride,
// x5 :dst stride,
// x6 :pointer to scaling matrix,
// x7 :pointer to threshold matrix,
// stack qbits,
// rounding factor,
// pointer to store nnz
// pointer to store non quantized dc value
// values returned : none
//
// register usage :
// stack usage : 64 bytes
// cycles :
// interruptiaility : interruptable
//
// known limitations
// \assumptions :
//
// revision history :
// dd mm yyyy author(s) changes
// 1 12 2013 100633 first version
// 20 1 2014 100633 changes the api, optimization
//
//*****************************************************************************
.global ih264_resi_trans_quant_4x4_av8
ih264_resi_trans_quant_4x4_av8:
//x0 :pointer to src buffer
//x1 :pointer to pred buffer
//x2 :pointer to dst buffer
//x3 :source stride
//x4 :pred stride
//x5 :dst stride,
//x6 :scale matirx,
//x7 :threshold matrix
// :qbits
// :round factor
// :nnz
// :pointer to store non quantized dc value
push_v_regs
//x0 :pointer to src buffer
//x1 :pointer to pred buffer
//x2 :pointer to dst buffer
//x3 :source stride
//x4 :pred stride
//x5 :scale matirx,
//x6 :threshold matrix
//x7 :qbits
//x8 :round factor
//x9 :nnz
//x10 :pointer to store non quantized dc value
ldr w8, [sp, #64] //load round factor
ldr x10, [sp, #80] //load addres for non quant val
neg x7, x7 //negate the qbit value for usiing lsl
ldr x9, [sp, #72]
//------------fucntion loading done----------------;
ld1 {v30.8b}, [x0], x3 //load first 8 pix src row 1
ld1 {v31.8b}, [x1], x4 //load first 8 pix pred row 1
ld1 {v28.8b}, [x0], x3 //load first 8 pix src row 2
ld1 {v29.8b}, [x1], x4 //load first 8 pix pred row 2
ld1 {v26.8b}, [x0], x3 //load first 8 pix src row 3
ld1 {v27.8b}, [x1], x4 //load first 8 pix pred row 3
ld1 {v24.8b}, [x0] //load first 8 pix src row 4
ld1 {v25.8b}, [x1] //load first 8 pix pred row 4
usubl v0.8h, v30.8b, v31.8b //find residue row 1
usubl v2.8h, v28.8b, v29.8b //find residue row 2
usubl v4.8h, v26.8b, v27.8b //find residue row 3
usubl v6.8h, v24.8b, v25.8b //find residue row 4
trn1 v1.4h, v0.4h, v2.4h
trn2 v3.4h, v0.4h, v2.4h //t12
trn1 v5.4h, v4.4h, v6.4h
trn2 v7.4h, v4.4h, v6.4h //t23
trn1 v0.2s, v1.2s, v5.2s
trn2 v4.2s, v1.2s, v5.2s //t13
trn1 v2.2s, v3.2s, v7.2s
trn2 v6.2s, v3.2s, v7.2s //t14
add v8.4h, v0.4h, v6.4h //x0 = x4+x7
add v9.4h, v2.4h, v4.4h //x1 = x5+x6
sub v10.4h, v2.4h, v4.4h //x2 = x5-x6
sub v11.4h, v0.4h, v6.4h //x3 = x4-x7
shl v12.4h, v10.4h, #1 //u_shift(x2,1,shft)
shl v13.4h, v11.4h, #1 //u_shift(x3,1,shft)
add v14.4h, v8.4h, v9.4h //x4 = x0 + x1;
sub v16.4h, v8.4h, v9.4h //x6 = x0 - x1;
add v15.4h, v13.4h, v10.4h //x5 = u_shift(x3,1,shft) + x2;
sub v17.4h, v11.4h, v12.4h //x7 = x3 - u_shift(x2,1,shft);
//taking transpose again so as to make do vert transform
trn1 v0.4h, v14.4h, v15.4h
trn2 v1.4h, v14.4h, v15.4h //t12
trn1 v2.4h, v16.4h, v17.4h
trn2 v3.4h, v16.4h, v17.4h //t23
trn1 v14.2s, v0.2s, v2.2s
trn2 v16.2s, v0.2s, v2.2s //t13
trn1 v15.2s, v1.2s, v3.2s
trn2 v17.2s, v1.2s, v3.2s //t24
//let us do vertical transform
//same code as horiz
add v18.4h, v14.4h , v17.4h //x0 = x4+x7
add v19.4h, v15.4h , v16.4h //x1 = x5+x6
sub v20.4h, v15.4h , v16.4h //x2 = x5-x6
sub v21.4h, v14.4h , v17.4h //x3 = x4-x7
shl v22.4h, v20.4h, #1 //u_shift(x2,1,shft)
shl v23.4h, v21.4h, #1 //u_shift(x3,1,shft)
dup v8.4s, w8 //load rounding value row 1
add v24.4h, v18.4h , v19.4h //x5 = x0 + x1;
sub v26.4h, v18.4h , v19.4h //x7 = x0 - x1;
add v25.4h, v23.4h , v20.4h //x6 = u_shift(x3,1,shft) + x2;
sub v27.4h, v21.4h , v22.4h //x8 = x3 - u_shift(x2,1,shft);
dup v23.4s, w8 //load round factor values
st1 {v24.h}[0], [x10] //store the dc value to alternate dc sddress
//core tranform is done for 4x8 block 1
ld1 {v28.4h-v31.4h}, [x5] //load the scaling values
abs v0.4h, v24.4h //abs val of row 1
abs v1.4h, v25.4h //abs val of row 2
abs v2.4h, v26.4h //abs val of row 3
abs v3.4h, v27.4h //abs val of row 4
cmgt v4.4h, v24.4h, #0
cmgt v5.4h, v25.4h, #0
cmgt v6.4h, v26.4h, #0
cmgt v7.4h, v27.4h, #0
smull v0.4s, v0.4h, v28.4h //multiply and add row 1
smull v1.4s, v1.4h, v29.4h //multiply and add row 2
smull v2.4s, v2.4h, v30.4h //multiply and add row 3
smull v3.4s, v3.4h, v31.4h //multiply and add row 4
add v20.4s, v0.4s, v23.4s
add v21.4s, v1.4s, v23.4s
add v22.4s, v2.4s, v23.4s
add v23.4s, v3.4s, v23.4s
dup v24.4s, w7
sshl v20.4s, v20.4s, v24.4s //shift row 1
sshl v21.4s, v21.4s, v24.4s //shift row 2
sshl v22.4s, v22.4s, v24.4s //shift row 3
sshl v23.4s, v23.4s, v24.4s //shift row 4
xtn v20.4h, v20.4s //narrow row 1
xtn v21.4h, v21.4s //narrow row 2
xtn v22.4h, v22.4s //narrow row 3
xtn v23.4h, v23.4s //narrow row 4
neg v24.8h, v20.8h //get negative
neg v25.8h, v21.8h //get negative
neg v26.8h, v22.8h //get negative
neg v27.8h, v23.8h //get negative
//compare with zero for computng nnz
cmeq v0.4h, v20.4h, #0
cmeq v1.4h, v21.4h, #0
cmeq v2.4h, v22.4h, #0
cmeq v3.4h, v23.4h, #0
bsl v4.8b, v20.8b, v24.8b //restore sign of row 1 and 2
bsl v5.8b, v21.8b, v25.8b //restore sign of row 3 and 4
bsl v6.8b, v22.8b, v26.8b //restore sign of row 1 and 2
bsl v7.8b, v23.8b, v27.8b //restore sign of row 3 and 4
//narrow the comaprison result
mov v0.d[1], v2.d[0]
mov v1.d[1], v3.d[0]
xtn v0.8b, v0.8h
xtn v1.8b, v1.8h
ushr v0.8b, v0.8b, #7 //i reduce comaparison bit to a signle bit row 1 and 2 blk 1 and 2 [ keep the value for later use ]
ushr v1.8b, v1.8b, #7 //i reduce comaparison bit to a signle bit row 1 and 2 blk 1 and 2 [ keep the value for later use ]
add v0.8b, v0.8b, v1.8b //i pair add nnz 1
addp v0.8b, v0.8b, v0.8b //i pair add nnz 1
addp v0.8b, v0.8b, v0.8b //i pair add nnz 1
addp v0.8b, v0.8b, v0.8b //i pair add nnz 1
st1 {v4.4h-v7.4h}, [x2] //store blk
movi v25.8b, #16 //get max nnz
sub v26.8b, v25.8b , v0.8b //invert current nnz
st1 {v26.b}[0], [x9] //write nnz
pop_v_regs
ret
//*****************************************************************************
//*
//* function name : ih264_resi_trans_quant_chroma_4x4
//* description : this function does residue calculation, forward transform
//* and quantization for 4x4 chroma block.
//*
//* arguments : x0 :pointer to src buffer
// x1 :pointer to pred buffer
// x2 :pointer to dst buffer
// x3 :source stride
// x4 :pred stride,
// x5 :dst stride,
// x6 :pointer to scaling matrix,
// x7 :pointer to threshold matrix,
// stack qbits,
// rounding factor,
// pointer to store nnz
// pointer to store unquantized dc values
// values returned : none
//
// register usage :
// stack usage : 64 bytes
// cycles :
// interruptiaility : interruptable
//
// known limitations
// \assumptions :
//
// revision history :
// dd mm yyyy author(s) changes
// 11 2 2015 100664 first version
// 25 2 2015 100633 first av8 version
//*****************************************************************************
.global ih264_resi_trans_quant_chroma_4x4_av8
ih264_resi_trans_quant_chroma_4x4_av8:
//x0 :pointer to src buffer
//x1 :pointer to pred buffer
//x2 :pointer to dst buffer
//x3 :source stride
//stack :pred stride
// :scale matirx,
// :threshold matrix
// :qbits
// :round factor
// :nnz
// :pu1_dc_alt_addr
push_v_regs
//x0 :pointer to src buffer
//x1 :pointer to pred buffer
//x2 :pointer to dst buffer
//x3 :source stride
//x4 :pred stride
//x5 :scale matirx,
//x6 :threshold matrix
//x7 :qbits
//x8 :round factor
//x9 :nnz
//x10 :pointer to store non quantized dc value
ldr w8, [sp, #64] //load round factor
ldr x10, [sp, #80] //load addres for non quant val
neg x7, x7 //negate the qbit value for usiing lsl
ldr x9, [sp, #72]
//------------fucntion loading done----------------;
ld1 {v30.8b}, [x0], x3 //load first 8 pix src row 1
ld1 {v31.8b}, [x1], x4 //load first 8 pix pred row 1
ld1 {v28.8b}, [x0], x3 //load first 8 pix src row 2
ld1 {v29.8b}, [x1], x4 //load first 8 pix pred row 2
ld1 {v26.8b}, [x0], x3 //load first 8 pix src row 3
ld1 {v27.8b}, [x1], x4 //load first 8 pix pred row 3
ld1 {v24.8b}, [x0] //load first 8 pix src row 4
ld1 {v25.8b}, [x1] //load first 8 pix pred row 4
//deinterleave the loaded values
uzp1 v30.8b, v30.8b, v30.8b
uzp1 v31.8b, v31.8b, v31.8b
uzp1 v28.8b, v28.8b, v28.8b
uzp1 v29.8b, v29.8b, v29.8b
uzp1 v26.8b, v26.8b, v26.8b
uzp1 v27.8b, v27.8b, v27.8b
uzp1 v24.8b, v24.8b, v24.8b
uzp1 v25.8b, v25.8b, v25.8b
//this deinterleaving is the only differnece betweenchrom and luma fucntions
usubl v0.8h, v30.8b, v31.8b //find residue row 1
usubl v2.8h, v28.8b, v29.8b //find residue row 2
usubl v4.8h, v26.8b, v27.8b //find residue row 3
usubl v6.8h, v24.8b, v25.8b //find residue row 4
trn1 v1.4h, v0.4h, v2.4h
trn2 v3.4h, v0.4h, v2.4h //t12
trn1 v5.4h, v4.4h, v6.4h
trn2 v7.4h, v4.4h, v6.4h //t23
trn1 v0.2s, v1.2s, v5.2s
trn2 v4.2s, v1.2s, v5.2s //t13
trn1 v2.2s, v3.2s, v7.2s
trn2 v6.2s, v3.2s, v7.2s //t14
add v8.4h, v0.4h, v6.4h //x0 = x4+x7
add v9.4h, v2.4h, v4.4h //x1 = x5+x6
sub v10.4h, v2.4h, v4.4h //x2 = x5-x6
sub v11.4h, v0.4h, v6.4h //x3 = x4-x7
shl v12.4h, v10.4h, #1 //u_shift(x2,1,shft)
shl v13.4h, v11.4h, #1 //u_shift(x3,1,shft)
add v14.4h, v8.4h, v9.4h //x4 = x0 + x1;
sub v16.4h, v8.4h, v9.4h //x6 = x0 - x1;
add v15.4h, v13.4h, v10.4h //x5 = u_shift(x3,1,shft) + x2;
sub v17.4h, v11.4h, v12.4h //x7 = x3 - u_shift(x2,1,shft);
//taking transpose again so as to make do vert transform
trn1 v0.4h, v14.4h, v15.4h
trn2 v1.4h, v14.4h, v15.4h //t12
trn1 v2.4h, v16.4h, v17.4h
trn2 v3.4h, v16.4h, v17.4h //t23
trn1 v14.2s, v0.2s, v2.2s
trn2 v16.2s, v0.2s, v2.2s //t13
trn1 v15.2s, v1.2s, v3.2s
trn2 v17.2s, v1.2s, v3.2s //t24
//let us do vertical transform
//same code as horiz
add v18.4h, v14.4h , v17.4h //x0 = x4+x7
add v19.4h, v15.4h , v16.4h //x1 = x5+x6
sub v20.4h, v15.4h , v16.4h //x2 = x5-x6
sub v21.4h, v14.4h , v17.4h //x3 = x4-x7
shl v22.4h, v20.4h, #1 //u_shift(x2,1,shft)
shl v23.4h, v21.4h, #1 //u_shift(x3,1,shft)
dup v8.4s, w8 //load rounding value row 1
add v24.4h, v18.4h , v19.4h //x5 = x0 + x1;
sub v26.4h, v18.4h , v19.4h //x7 = x0 - x1;
add v25.4h, v23.4h , v20.4h //x6 = u_shift(x3,1,shft) + x2;
sub v27.4h, v21.4h , v22.4h //x8 = x3 - u_shift(x2,1,shft);
dup v23.4s, w8 //load round factor values
st1 {v24.h}[0], [x10] //store the dc value to alternate dc sddress
//core tranform is done for 4x8 block 1
ld1 {v28.4h-v31.4h}, [x5] //load the scaling values
abs v0.4h, v24.4h //abs val of row 1
abs v1.4h, v25.4h //abs val of row 2
abs v2.4h, v26.4h //abs val of row 3
abs v3.4h, v27.4h //abs val of row 4
cmgt v4.4h, v24.4h, #0
cmgt v5.4h, v25.4h, #0
cmgt v6.4h, v26.4h, #0
cmgt v7.4h, v27.4h, #0
smull v0.4s, v0.4h, v28.4h //multiply and add row 1
smull v1.4s, v1.4h, v29.4h //multiply and add row 2
smull v2.4s, v2.4h, v30.4h //multiply and add row 3
smull v3.4s, v3.4h, v31.4h //multiply and add row 4
add v20.4s, v0.4s, v23.4s
add v21.4s, v1.4s, v23.4s
add v22.4s, v2.4s, v23.4s
add v23.4s, v3.4s, v23.4s
dup v24.4s, w7
sshl v20.4s, v20.4s, v24.4s //shift row 1
sshl v21.4s, v21.4s, v24.4s //shift row 2
sshl v22.4s, v22.4s, v24.4s //shift row 3
sshl v23.4s, v23.4s, v24.4s //shift row 4
xtn v20.4h, v20.4s //narrow row 1
xtn v21.4h, v21.4s //narrow row 2
xtn v22.4h, v22.4s //narrow row 3
xtn v23.4h, v23.4s //narrow row 4
neg v24.8h, v20.8h //get negative
neg v25.8h, v21.8h //get negative
neg v26.8h, v22.8h //get negative
neg v27.8h, v23.8h //get negative
//compare with zero for computng nnz
cmeq v0.4h, v20.4h, #0
cmeq v1.4h, v21.4h, #0
cmeq v2.4h, v22.4h, #0
cmeq v3.4h, v23.4h, #0
bsl v4.8b, v20.8b, v24.8b //restore sign of row 1 and 2
bsl v5.8b, v21.8b, v25.8b //restore sign of row 3 and 4
bsl v6.8b, v22.8b, v26.8b //restore sign of row 1 and 2
bsl v7.8b, v23.8b, v27.8b //restore sign of row 3 and 4
//narrow the comaprison result
mov v0.d[1], v2.d[0]
mov v1.d[1], v3.d[0]
xtn v0.8b, v0.8h
xtn v1.8b, v1.8h
ushr v0.8b, v0.8b, #7 //i reduce comaparison bit to a signle bit row 1 and 2 blk 1 and 2 [ keep the value for later use ]
ushr v1.8b, v1.8b, #7 //i reduce comaparison bit to a signle bit row 1 and 2 blk 1 and 2 [ keep the value for later use ]
add v0.8b, v0.8b, v1.8b //i pair add nnz 1
addp v0.8b, v0.8b, v0.8b //i pair add nnz 1
addp v0.8b, v0.8b, v0.8b //i pair add nnz 1
addp v0.8b, v0.8b, v0.8b //i pair add nnz 1
st1 {v4.4h-v7.4h}, [x2] //store blk
movi v25.8b, #16 //get max nnz
sub v26.8b, v25.8b , v0.8b //invert current nnz
st1 {v26.b}[0], [x9] //write nnz
pop_v_regs
ret
//*****************************************************************************
//*
//* function name : ih264_hadamard_quant_4x4_av8
//* description : this function does forward hadamard transform and
//* quantization for luma dc block
//*
//* arguments : x0 :pointer to src buffer
// x1 :pointer to dst buffer
// x2 :pu2_scale_matrix
// x2 :pu2_threshold_matrix
// x3 :u4_qbits
// x4 :u4_round_factor
// x5 :pu1_nnz
// values returned : none
//
// register usage :
// stack usage : 0 bytes
// cycles : around
// interruptiaility : interruptable
//
// known limitations
// \assumptions :
//
// revision history :
// dd mm yyyy author(s) changes
// 20 2 2015 100633 first version
//
//*****************************************************************************
//ih264_hadamard_quant_4x4_av8(word16 *pi2_src, word16 *pi2_dst,
// const uword16 *pu2_scale_matrix,
// const uword16 *pu2_threshold_matrix, uword32 u4_qbits,
// uword32 u4_round_factor,uword8 *pu1_nnz
// )
.global ih264_hadamard_quant_4x4_av8
ih264_hadamard_quant_4x4_av8:
//x0 :pointer to src buffer
//x1 :pointer to dst buffer
//x2 :pu2_scale_matrix
//x3 :pu2_threshold_matrix
//x4 :u4_qbits
//x5 :u4_round_factor
//x6 :pu1_nnz
push_v_regs
ld4 {v0.4h-v3.4h}, [x0] //load 4x4 block
ld1 {v30.h}[0], [x2] //load pu2_scale_matrix[0]
saddl v4.4s, v0.4h, v3.4h //x0 = x4 + x7;
saddl v5.4s, v1.4h, v2.4h //x1 = x5 + x6;
ssubl v6.4s, v1.4h, v2.4h //x2 = x5 - x6;
ssubl v7.4s, v0.4h, v3.4h //x3 = x4 - x7;
dup v30.8h, v30.h[0] //pu2_scale_matrix[0]
add v14.4s, v4.4s, v5.4s //pi2_dst[0] = x0 + x1;
add v15.4s, v7.4s, v6.4s //pi2_dst[1] = x3 + x2;
sub v16.4s, v4.4s, v5.4s //pi2_dst[2] = x0 - x1;
sub v17.4s, v7.4s, v6.4s //pi2_dst[3] = x3 - x2;
//transpose 4x4 block
trn1 v18.4s, v14.4s, v15.4s
trn2 v19.4s, v14.4s, v15.4s
trn1 v20.4s, v16.4s, v17.4s
trn2 v21.4s, v16.4s, v17.4s
trn1 v14.2d, v18.2d, v20.2d
trn2 v16.2d, v18.2d, v20.2d
trn1 v15.2d, v19.2d, v21.2d
trn2 v17.2d, v19.2d, v21.2d
//end transpose
add v18.4s, v14.4s, v17.4s //x0 = x4 + x7;
add v19.4s, v15.4s, v16.4s //x1 = x5 + x6;
sub v20.4s, v15.4s, v16.4s //x2 = x5 - x6;
sub v21.4s, v14.4s, v17.4s //x3 = x4 - x7;
dup v14.4s, w5 //round factor
dup v15.4s, v14.s[0]
dup v16.4s, v14.s[0]
dup v17.4s, v14.s[0]
add v22.4s, v18.4s, v19.4s //(x0 + x1)
add v23.4s, v21.4s, v20.4s //(x3 + x2)
sub v24.4s, v18.4s, v19.4s //(x0 - x1)
sub v25.4s, v21.4s, v20.4s //(x3 - x2)
shrn v0.4h, v22.4s, #1 //i4_value = (x0 + x1) >> 1;
shrn2 v0.8h, v23.4s, #1 //i4_value = (x3 + x2) >> 1;
shrn v1.4h, v24.4s, #1 //i4_value = (x0 - x1) >> 1;
shrn2 v1.8h, v25.4s, #1 //i4_value = (x3 - x2) >> 1;
abs v2.8h, v0.8h
abs v3.8h, v1.8h
cmgt v4.8h, v0.8h, #0 //get the sign row 1,2
cmgt v5.8h, v1.8h, #0
neg w4, w4 //-u4_qbits
dup v22.4s, w4 //load -u4_qbits
umlal v14.4s, v2.4h, v30.4h
umlal2 v15.4s, v2.8h, v30.8h
umlal v16.4s, v3.4h, v30.4h
umlal2 v17.4s, v3.8h, v30.8h
ushl v14.4s, v14.4s, v22.4s
ushl v15.4s, v15.4s, v22.4s
ushl v16.4s, v16.4s, v22.4s
ushl v17.4s, v17.4s, v22.4s
uqxtn v14.4h, v14.4s
uqxtn2 v14.8h, v15.4s
uqxtn v16.4h, v16.4s
uqxtn2 v16.8h, v17.4s
neg v15.8h, v14.8h
neg v17.8h, v16.8h
bsl v4.16b, v14.16b, v15.16b
bsl v5.16b, v16.16b, v17.16b
cmeq v0.8h, v14.8h, #0
cmeq v1.8h, v16.8h, #0
st1 {v4.8h-v5.8h}, [x1]
movi v20.8b, #16
xtn v2.8b, v0.8h
xtn v3.8b, v1.8h
ushr v2.8b, v2.8b, #7
ushr v3.8b, v3.8b, #7
add v2.8b, v2.8b, v3.8b
addp v2.8b, v2.8b, v2.8b
addp v2.8b, v2.8b, v2.8b
addp v2.8b, v2.8b, v2.8b
sub v20.8b, v20.8b, v2.8b
st1 {v20.b}[0], [x6]
pop_v_regs
ret
//*****************************************************************************
//*
//* function name : ih264_hadamard_quant_2x2_uv
//* description : this function does forward hadamard transform and
//* quantization for dc block of chroma for both planes
//*
//* arguments : x0 :pointer to src buffer
// x1 :pointer to dst buffer
// x2 :pu2_scale_matrix
// x2 :pu2_threshold_matrix
// x3 :u4_qbits
// x4 :u4_round_factor
// x5 :pu1_nnz
// values returned : none
//
// register usage :
// stack usage : 0 bytes
// cycles : around
// interruptiaility : interruptable
//
// known limitations
// \assumptions :
//
// revision history :
// dd mm yyyy author(s) changes
// 20 2 2015 100633 first version
//
//*****************************************************************************
// ih264_hadamard_quant_2x2_uv_av8(word16 *pi2_src, word16 *pi2_dst,
// const uword16 *pu2_scale_matrix,
// const uword16 *pu2_threshold_matrix, uword32 u4_qbits,
// uword32 u4_round_factor,uword8 *pu1_nnz
// )
.global ih264_hadamard_quant_2x2_uv_av8
ih264_hadamard_quant_2x2_uv_av8:
push_v_regs
ld2 {v0.4h-v1.4h}, [x0] //load src
ld1 {v30.h}[0], [x2] //load pu2_scale_matrix[0]
dup v30.4h, v30.h[0] //pu2_scale_matrix
uxtl v30.4s, v30.4h //pu2_scale_matrix
neg w4, w4
dup v24.4s, w4 //u4_qbits
dup v25.4s, w5 //round fact
dup v26.4s, v25.s[0]
saddl v2.4s, v0.4h, v1.4h //x0 = x4 + x5;, x2 = x6 + x7;
ssubl v3.4s, v0.4h, v1.4h //x1 = x4 - x5; x3 = x6 - x7;
trn1 v4.4s, v2.4s, v3.4s
trn2 v5.4s, v2.4s, v3.4s //q1 -> x0 x1, q2 -> x2 x3
add v0.4s, v4.4s , v5.4s // (x0 + x2) (x1 + x3) (y0 + y2); (y1 + y3);
sub v1.4s, v4.4s , v5.4s // (x0 - x2) (x1 - x3) (y0 - y2); (y1 - y3);
abs v2.4s, v0.4s
abs v3.4s, v1.4s
cmgt v4.4s, v0.4s, #0 //get the sign row 1,2
cmgt v5.4s, v1.4s, #0
uqxtn v4.4h, v4.4s
sqxtn2 v4.8h, v5.4s
mla v25.4s, v2.4s, v30.4s
mla v26.4s, v3.4s, v30.4s
ushl v2.4s, v25.4s, v24.4s //>>qbit
ushl v3.4s, v26.4s, v24.4s //>>qbit
uqxtn v2.4h, v2.4s
uqxtn2 v2.8h, v3.4s
neg v5.8h, v2.8h
bsl v4.16b, v2.16b, v5.16b //*sign
//rearrange such that we get each plane coeffs as continous
mov v5.s[0], v4.s[1]
mov v4.s[1], v4.s[2]
mov v4.s[2], v5.s[0]
cmeq v5.8h, v4.8h, #0 //compute nnz
xtn v5.8b, v5.8h //reduce nnz comparison to 1 bit
ushr v5.8b, v5.8b, #7 //reduce nnz comparison to 1 bit
movi v20.8b, #4 //since we add zeros, we need to subtract from 4 to get nnz
addp v5.8b, v5.8b, v5.8b //sum up nnz
addp v5.8b, v5.8b, v5.8b //sum up nnz
st1 {v4.8h}, [x1] //store the block
st1 {v4.8h}, [x1] //store the block
sub v20.8b, v20.8b, v5.8b //4- numzeros
st1 {v20.h}[0], [x6] //store nnz
pop_v_regs
ret