//****************************************************************************** //* //* 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_weighted_bi_pred_av8.s //* //* @brief //* Contains function definitions for weighted biprediction. //* //* @author //* Kaushik Senthoor R //* //* @par List of Functions: //* //* - ih264_weighted_bi_pred_luma_av8() //* - ih264_weighted_bi_pred_chroma_av8() //* //* @remarks //* None //* //******************************************************************************* //*/ //******************************************************************************* //* @function //* ih264_weighted_bi_pred_luma_av8() //* //* @brief //* This routine performs the default weighted prediction as described in sec //* 8.4.2.3.2 titled "Weighted sample prediction process" for luma. //* //* @par Description: //* This function gets two ht x wd blocks, calculates the weighted samples, //* rounds off, adds offset and stores it in the destination block. //* //* @param[in] puc_src1 //* UWORD8 Pointer to the buffer containing the input block 1. //* //* @param[in] puc_src2 //* UWORD8 Pointer to the buffer containing the input block 2. //* //* @param[out] puc_dst //* UWORD8 pointer to the destination where the output block is stored. //* //* @param[in] src_strd1 //* Stride of the input buffer 1 //* //* @param[in] src_strd2 //* Stride of the input buffer 2 //* //* @param[in] dst_strd //* Stride of the destination buffer //* //* @param[in] log_WD //* number of bits to be rounded off //* //* @param[in] wt1 //* weight for the weighted prediction //* //* @param[in] wt2 //* weight for the weighted prediction //* //* @param[in] ofst1 //* offset 1 used after rounding off //* //* @param[in] ofst2 //* offset 2 used after rounding off //* //* @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_weighted_bi_pred_luma_av8(UWORD8 *puc_src1, // UWORD8 *puc_src2, // UWORD8 *puc_dst, // WORD32 src_strd1, // WORD32 src_strd2, // WORD32 dst_strd, // UWORD16 log_WD, // UWORD32 wt1, // UWORD32 wt2, // UWORD16 ofst1, // UWORD16 ofst2, // UWORD8 ht, // UWORD8 wd) // //**************Variables Vs Registers***************************************** // x0 => puc_src1 // x1 => puc_src2 // x2 => puc_dst // x3 => src_strd1 // [sp] => src_strd2 (x4) // [sp+4] => dst_strd (x5) // [sp+8] => log_WD (x6) // [sp+12] => wt1 (x7) // [sp+16] => wt2 (x8) // [sp+20] => ofst1 (x9) // [sp+24] => ofst2 (x10) // [sp+28] => ht (x11) // [sp+32] => wd (x12) // .text .p2align 2 .include "ih264_neon_macros.s" .global ih264_weighted_bi_pred_luma_av8 ih264_weighted_bi_pred_luma_av8: // STMFD sp!, {x4-x12,x14} //stack stores the values of the arguments push_v_regs stp x19, x20, [sp, #-16]! ldr x8, [sp, #80] //Load wt2 in x8 ldr x9, [sp, #88] //Load ofst1 in x9 add x6, x6, #1 //x6 = log_WD + 1 sub x20, x6, #0 //x13 = -(log_WD + 1) neg x10, x20 dup v0.8h, w10 //Q0 = -(log_WD + 1) (32-bit) ldr x10, [sp, #96] //Load ofst2 in x10 ldr x11, [sp, #104] //Load ht in x11 ldr x12, [sp, #112] //Load wd in x12 add x9, x9, #1 //x9 = ofst1 + 1 add x9, x9, x10 //x9 = ofst1 + ofst2 + 1 mov v2.s[0], w7 mov v2.s[1], w8 //D2 = {wt1(32-bit), wt2(32-bit)} asr x9, x9, #1 //x9 = ofst = (ofst1 + ofst2 + 1) >> 1 dup v3.8b, w9 //D3 = ofst (8-bit) cmp w12, #16 beq loop_16 //branch if wd is 16 cmp w12, #8 //check if wd is 8 beq loop_8 //branch if wd is 8 loop_4: //each iteration processes four rows ld1 {v4.s}[0], [x0], x3 //load row 1 in source 1 ld1 {v4.s}[1], [x0], x3 //load row 2 in source 1 ld1 {v6.s}[0], [x1], x4 //load row 1 in source 2 ld1 {v6.s}[1], [x1], x4 //load row 2 in source 2 uxtl v4.8h, v4.8b //converting rows 1,2 in source 1 to 16-bit ld1 {v8.s}[0], [x0], x3 //load row 3 in source 1 ld1 {v8.s}[1], [x0], x3 //load row 4 in source 1 uxtl v6.8h, v6.8b //converting rows 1,2 in source 2 to 16-bit ld1 {v10.s}[0], [x1], x4 //load row 3 in source 2 ld1 {v10.s}[1], [x1], x4 //load row 4 in source 2 uxtl v8.8h, v8.8b //converting rows 3,4 in source 1 to 16-bit uxtl v10.8h, v10.8b //converting rows 3,4 in source 2 to 16-bit mul v4.8h, v4.8h , v2.h[0] //weight 1 mult. for rows 1,2 mla v4.8h, v6.8h , v2.h[2] //weight 2 mult. for rows 1,2 mul v8.8h, v8.8h , v2.h[0] //weight 1 mult. for rows 3,4 mla v8.8h, v10.8h , v2.h[2] //weight 2 mult. for rows 3,4 subs w11, w11, #4 //decrement ht by 4 srshl v4.8h, v4.8h , v0.8h //rounds off the weighted samples from rows 1,2 srshl v8.8h, v8.8h , v0.8h //rounds off the weighted samples from rows 3,4 saddw v4.8h, v4.8h , v3.8b //adding offset for rows 1,2 saddw v8.8h, v8.8h , v3.8b //adding offset for rows 3,4 sqxtun v4.8b, v4.8h //saturating rows 1,2 to unsigned 8-bit sqxtun v8.8b, v8.8h //saturating rows 3,4 to unsigned 8-bit st1 {v4.s}[0], [x2], x5 //store row 1 in destination st1 {v4.s}[1], [x2], x5 //store row 2 in destination st1 {v8.s}[0], [x2], x5 //store row 3 in destination st1 {v8.s}[1], [x2], x5 //store 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 {v4.8b}, [x0], x3 //load row 1 in source 1 ld1 {v6.8b}, [x1], x4 //load row 1 in source 2 ld1 {v8.8b}, [x0], x3 //load row 2 in source 1 ld1 {v10.8b}, [x1], x4 //load row 2 in source 2 uxtl v4.8h, v4.8b //converting row 1 in source 1 to 16-bit ld1 {v12.8b}, [x0], x3 //load row 3 in source 1 ld1 {v14.8b}, [x1], x4 //load row 3 in source 2 uxtl v6.8h, v6.8b //converting row 1 in source 2 to 16-bit ld1 {v16.8b}, [x0], x3 //load row 4 in source 1 ld1 {v18.8b}, [x1], x4 //load row 4 in source 2 uxtl v8.8h, v8.8b //converting row 2 in source 1 to 16-bit uxtl v10.8h, v10.8b //converting row 2 in source 2 to 16-bit mul v4.8h, v4.8h , v2.h[0] //weight 1 mult. for row 1 mla v4.8h, v6.8h , v2.h[2] //weight 2 mult. for row 1 uxtl v12.8h, v12.8b //converting row 3 in source 1 to 16-bit uxtl v14.8h, v14.8b //converting row 3 in source 2 to 16-bit mul v8.8h, v8.8h , v2.h[0] //weight 1 mult. for row 2 mla v8.8h, v10.8h , v2.h[2] //weight 2 mult. for row 2 uxtl v16.8h, v16.8b //converting row 4 in source 1 to 16-bit uxtl v18.8h, v18.8b //converting row 4 in source 2 to 16-bit mul v12.8h, v12.8h , v2.h[0] //weight 1 mult. for row 3 mla v12.8h, v14.8h , v2.h[2] //weight 2 mult. for row 3 mul v16.8h, v16.8h , v2.h[0] //weight 1 mult. for row 4 mla v16.8h, v18.8h , v2.h[2] //weight 2 mult. for row 4 srshl v4.8h, v4.8h , v0.8h //rounds off the weighted samples from row 1 srshl v8.8h, v8.8h , v0.8h //rounds off the weighted samples from row 2 srshl v12.8h, v12.8h , v0.8h //rounds off the weighted samples from row 3 saddw v4.8h, v4.8h , v3.8b //adding offset for row 1 srshl v16.8h, v16.8h , v0.8h //rounds off the weighted samples from row 4 saddw v8.8h, v8.8h , v3.8b //adding offset for row 2 saddw v12.8h, v12.8h , v3.8b //adding offset for row 3 sqxtun v4.8b, v4.8h //saturating row 1 to unsigned 8-bit saddw v16.8h, v16.8h , v3.8b //adding offset for row 4 sqxtun v8.8b, v8.8h //saturating row 2 to unsigned 8-bit sqxtun v12.8b, v12.8h //saturating row 3 to unsigned 8-bit sqxtun v16.8b, v16.8h //saturating row 4 to unsigned 8-bit st1 {v4.8b}, [x2], x5 //store row 1 in destination st1 {v8.8b}, [x2], x5 //store row 2 in destination subs w11, w11, #4 //decrement ht by 4 st1 {v12.8b}, [x2], x5 //store row 3 in destination st1 {v16.8b}, [x2], x5 //store row 4 in destination bgt loop_8 //if greater than 0 repeat the loop again b end_loops loop_16: //each iteration processes two rows ld1 {v4.8b, v5.8b}, [x0], x3 //load row 1 in source 1 ld1 {v6.8b, v7.8b}, [x1], x4 //load row 1 in source 2 ld1 {v8.8b, v9.8b}, [x0], x3 //load row 2 in source 1 ld1 {v10.8b, v11.8b}, [x1], x4 //load row 2 in source 2 uxtl v20.8h, v4.8b //converting row 1L in source 1 to 16-bit ld1 {v12.8b, v13.8b}, [x0], x3 //load row 3 in source 1 ld1 {v14.8b, v15.8b}, [x1], x4 //load row 3 in source 2 uxtl v22.8h, v6.8b //converting row 1L in source 2 to 16-bit ld1 {v16.8b, v17.8b}, [x0], x3 //load row 4 in source 1 ld1 {v18.8b, v19.8b}, [x1], x4 //load row 4 in source 2 uxtl v4.8h, v5.8b //converting row 1H in source 1 to 16-bit uxtl v6.8h, v7.8b //converting row 1H in source 2 to 16-bit mul v20.8h, v20.8h , v2.h[0] //weight 1 mult. for row 1L mla v20.8h, v22.8h , v2.h[2] //weight 2 mult. for row 1L uxtl v24.8h, v8.8b //converting row 2L in source 1 to 16-bit uxtl v26.8h, v10.8b //converting row 2L in source 2 to 16-bit mul v4.8h, v4.8h , v2.h[0] //weight 1 mult. for row 1H mla v4.8h, v6.8h , v2.h[2] //weight 2 mult. for row 1H uxtl v8.8h, v9.8b //converting row 2H in source 1 to 16-bit uxtl v10.8h, v11.8b //converting row 2H in source 2 to 16-bit mul v24.8h, v24.8h , v2.h[0] //weight 1 mult. for row 2L mla v24.8h, v26.8h , v2.h[2] //weight 2 mult. for row 2L uxtl v28.8h, v12.8b //converting row 3L in source 1 to 16-bit uxtl v30.8h, v14.8b //converting row 3L in source 2 to 16-bit mul v8.8h, v8.8h , v2.h[0] //weight 1 mult. for row 2H mla v8.8h, v10.8h , v2.h[2] //weight 2 mult. for row 2H uxtl v12.8h, v13.8b //converting row 3H in source 1 to 16-bit uxtl v14.8h, v15.8b //converting row 3H in source 2 to 16-bit mul v28.8h, v28.8h , v2.h[0] //weight 1 mult. for row 3L mla v28.8h, v30.8h , v2.h[2] //weight 2 mult. for row 3L uxtl v22.8h, v16.8b //converting row 4L in source 1 to 16-bit uxtl v6.8h, v18.8b //converting row 4L in source 2 to 16-bit mul v12.8h, v12.8h , v2.h[0] //weight 1 mult. for row 3H mla v12.8h, v14.8h , v2.h[2] //weight 2 mult. for row 3H uxtl v16.8h, v17.8b //converting row 4H in source 1 to 16-bit uxtl v18.8h, v19.8b //converting row 4H in source 2 to 16-bit mul v22.8h, v22.8h , v2.h[0] //weight 1 mult. for row 4L mla v22.8h, v6.8h , v2.h[2] //weight 2 mult. for row 4L srshl v20.8h, v20.8h , v0.8h //rounds off the weighted samples from row 1L mul v16.8h, v16.8h , v2.h[0] //weight 1 mult. for row 4H mla v16.8h, v18.8h , v2.h[2] //weight 2 mult. for row 4H srshl v4.8h, v4.8h , v0.8h //rounds off the weighted samples from row 1H srshl v24.8h, v24.8h , v0.8h //rounds off the weighted samples from row 2L saddw v20.8h, v20.8h , v3.8b //adding offset for row 1L srshl v8.8h, v8.8h , v0.8h //rounds off the weighted samples from row 2H saddw v4.8h, v4.8h , v3.8b //adding offset for row 1H srshl v28.8h, v28.8h , v0.8h //rounds off the weighted samples from row 3L saddw v24.8h, v24.8h , v3.8b //adding offset for row 2L srshl v12.8h, v12.8h , v0.8h //rounds off the weighted samples from row 3H saddw v8.8h, v8.8h , v3.8b //adding offset for row 2H srshl v22.8h, v22.8h , v0.8h //rounds off the weighted samples from row 4L saddw v28.8h, v28.8h , v3.8b //adding offset for row 3L srshl v16.8h, v16.8h , v0.8h //rounds off the weighted samples from row 4H saddw v12.8h, v12.8h , v3.8b //adding offset for row 3H sqxtun v26.8b, v20.8h //saturating row 1L to unsigned 8-bit saddw v22.8h, v22.8h , v3.8b //adding offset for row 4L sqxtun v27.8b, v4.8h //saturating row 1H to unsigned 8-bit saddw v16.8h, v16.8h , v3.8b //adding offset for row 4H sqxtun v10.8b, v24.8h //saturating row 2L to unsigned 8-bit sqxtun v11.8b, v8.8h //saturating row 2H to unsigned 8-bit sqxtun v30.8b, v28.8h //saturating row 3L to unsigned 8-bit sqxtun v31.8b, v12.8h //saturating row 3H to unsigned 8-bit st1 {v26.8b, v27.8b}, [x2], x5 //store row 1 in destination sqxtun v14.8b, v22.8h //saturating row 4L to unsigned 8-bit sqxtun v15.8b, v16.8h //saturating row 4H to unsigned 8-bit st1 {v10.8b, v11.8b}, [x2], x5 //store row 2 in destination subs w11, w11, #4 //decrement ht by 4 st1 {v30.8b, v31.8b}, [x2], x5 //store row 3 in destination st1 {v14.8b, v15.8b}, [x2], x5 //store row 4 in destination bgt loop_16 //if greater than 0 repeat the loop again end_loops: // LDMFD sp!,{x4-x12,x15} //Reload the registers from sp ldp x19, x20, [sp], #16 pop_v_regs ret //******************************************************************************* //* @function //* ih264_weighted_bi_pred_chroma_av8() //* //* @brief //* This routine performs the default weighted prediction as described in sec //* 8.4.2.3.2 titled "Weighted sample prediction process" for chroma. //* //* @par Description: //* This function gets two ht x wd blocks, calculates the weighted samples, //* rounds off, adds offset and stores it in the destination block for U and V. //* //* @param[in] puc_src1 //* UWORD8 Pointer to the buffer containing the input block 1. //* //* @param[in] puc_src2 //* UWORD8 Pointer to the buffer containing the input block 2. //* //* @param[out] puc_dst //* UWORD8 pointer to the destination where the output block is stored. //* //* @param[in] src_strd1 //* Stride of the input buffer 1 //* //* @param[in] src_strd2 //* Stride of the input buffer 2 //* //* @param[in] dst_strd //* Stride of the destination buffer //* //* @param[in] log_WD //* number of bits to be rounded off //* //* @param[in] wt1 //* weights for the weighted prediction in U and V //* //* @param[in] wt2 //* weights for the weighted prediction in U and V //* //* @param[in] ofst1 //* offset 1 used after rounding off for U an dV //* //* @param[in] ofst2 //* offset 2 used after rounding off for U and V //* //* @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_weighted_bi_pred_chroma_av8(UWORD8 *puc_src1, // UWORD8 *puc_src2, // UWORD8 *puc_dst, // WORD32 src_strd1, // WORD32 src_strd2, // WORD32 dst_strd, // UWORD16 log_WD, // UWORD32 wt1, // UWORD32 wt2, // UWORD16 ofst1, // UWORD16 ofst2, // UWORD8 ht, // UWORD8 wd) // //**************Variables Vs Registers***************************************** // x0 => puc_src1 // x1 => puc_src2 // x2 => puc_dst // x3 => src_strd1 // [sp] => src_strd2 (x4) // [sp+4] => dst_strd (x5) // [sp+8] => log_WD (x6) // [sp+12] => wt1 (x7) // [sp+16] => wt2 (x8) // [sp+20] => ofst1 (x9) // [sp+24] => ofst2 (x10) // [sp+28] => ht (x11) // [sp+32] => wd (x12) // .global ih264_weighted_bi_pred_chroma_av8 ih264_weighted_bi_pred_chroma_av8: // STMFD sp!, {x4-x12,x14} //stack stores the values of the arguments push_v_regs stp x19, x20, [sp, #-16]! ldr x8, [sp, #80] //Load wt2 in x8 dup v4.4s, w8 //Q2 = (wt2_u, wt2_v) (32-bit) dup v2.4s, w7 //Q1 = (wt1_u, wt1_v) (32-bit) add x6, x6, #1 //x6 = log_WD + 1 ldr w9, [sp, #88] //Load ofst1 in x9 sxtw x9, w9 ldr w10, [sp, #96] //Load ofst2 in x10 sxtw x10, w10 sub x20, x6, #0 //x12 = -(log_WD + 1) neg x20, x20 dup v0.8h, w20 //Q0 = -(log_WD + 1) (16-bit) ldr w11, [sp, #104] //Load ht in x11 ldr w12, [sp, #112] //Load wd in x12 sxtw x11, w11 sxtw x12, w12 dup v20.8h, w9 //0ffset1 dup v21.8h, w10 //0ffset2 srhadd v6.8b, v20.8b, v21.8b sxtl v6.8h, v6.8b cmp w12, #8 //check if wd is 8 beq loop_8_uv //branch if wd is 8 cmp w12, #4 //check if wd is 4 beq loop_4_uv //branch if wd is 4 loop_2_uv: //each iteration processes two rows ld1 {v8.s}[0], [x0], x3 //load row 1 in source 1 ld1 {v8.s}[1], [x0], x3 //load row 2 in source 1 ld1 {v10.s}[0], [x1], x4 //load row 1 in source 2 ld1 {v10.s}[1], [x1], x4 //load row 2 in source 2 uxtl v8.8h, v8.8b //converting rows 1,2 in source 1 to 16-bit uxtl v10.8h, v10.8b //converting rows 1,2 in source 2 to 16-bit mul v8.8h, v8.8h , v2.8h //weight 1 mult. for rows 1,2 mla v8.8h, v10.8h , v4.8h //weight 2 mult. for rows 1,2 srshl v8.8h, v8.8h , v0.8h //rounds off the weighted samples from rows 1,2 add v8.8h, v8.8h , v6.8h //adding offset for rows 1,2 sqxtun v8.8b, v8.8h //saturating rows 1,2 to unsigned 8-bit/ st1 {v8.s}[0], [x2], x5 //store row 1 in destination st1 {v8.s}[1], [x2], x5 //store row 2 in destination subs w11, w11, #2 //decrement ht by 2 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 {v8.8b}, [x0], x3 //load row 1 in source 1 ld1 {v10.8b}, [x1], x4 //load row 1 in source 2 uxtl v8.8h, v8.8b //converting row 1 in source 1 to 16-bit ld1 {v12.8b}, [x0], x3 //load row 2 in source 1 uxtl v10.8h, v10.8b //converting row 1 in source 2 to 16-bit ld1 {v14.8b}, [x1], x4 //load row 2 in source 2 uxtl v12.8h, v12.8b //converting row 2 in source 1 to 16-bit mul v8.8h, v8.8h , v2.8h //weight 1 mult. for row 1 mla v8.8h, v10.8h , v4.8h //weight 2 mult. for row 1 uxtl v14.8h, v14.8b //converting row 2 in source 2 to 16-bit mul v12.8h, v12.8h , v2.8h //weight 1 mult. for row 2 mla v12.8h, v14.8h , v4.8h //weight 2 mult. for row 2 subs w11, w11, #2 //decrement ht by 2 srshl v8.8h, v8.8h , v0.8h //rounds off the weighted samples from row 1 srshl v12.8h, v12.8h , v0.8h //rounds off the weighted samples from row 2 add v8.8h, v8.8h , v6.8h //adding offset for row 1 add v12.8h, v12.8h , v6.8h //adding offset for row 2 sqxtun v8.8b, v8.8h //saturating row 1 to unsigned 8-bit sqxtun v12.8b, v12.8h //saturating row 2 to unsigned 8-bit st1 {v8.8b}, [x2], x5 //store row 1 in destination st1 {v12.8b}, [x2], x5 //store 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 two rows ld1 {v8.8b, v9.8b}, [x0], x3 //load row 1 in source 1 ld1 {v10.8b, v11.8b}, [x1], x4 //load row 1 in source 2 ld1 {v12.8b, v13.8b}, [x0], x3 //load row 2 in source 1 ld1 {v14.8b, v15.8b}, [x1], x4 //load row 2 in source 2 uxtl v24.8h, v8.8b //converting row 1L in source 1 to 16-bit ld1 {v16.8b, v17.8b}, [x0], x3 //load row 3 in source 1 ld1 {v18.8b, v19.8b}, [x1], x4 //load row 3 in source 2 uxtl v26.8h, v10.8b //converting row 1L in source 2 to 16-bit ld1 {v20.8b, v21.8b}, [x0], x3 //load row 4 in source 1 ld1 {v22.8b, v23.8b}, [x1], x4 //load row 4 in source 2 uxtl v8.8h, v9.8b //converting row 1H in source 1 to 16-bit uxtl v10.8h, v11.8b //converting row 1H in source 2 to 16-bit mul v24.8h, v24.8h , v2.8h //weight 1 mult. for row 1L mla v24.8h, v26.8h , v4.8h //weight 2 mult. for row 1L uxtl v28.8h, v12.8b //converting row 2L in source 1 to 16-bit uxtl v30.8h, v14.8b //converting row 2L in source 2 to 16-bit mul v8.8h, v8.8h , v2.8h //weight 1 mult. for row 1H mla v8.8h, v10.8h , v4.8h //weight 2 mult. for row 1H uxtl v12.8h, v13.8b //converting row 2H in source 1 to 16-bit uxtl v14.8h, v15.8b //converting row 2H in source 2 to 16-bit mul v28.8h, v28.8h , v2.8h //weight 1 mult. for row 2L mla v28.8h, v30.8h , v4.8h //weight 2 mult. for row 2L uxtl v26.8h, v16.8b //converting row 3L in source 1 to 16-bit uxtl v10.8h, v18.8b //converting row 3L in source 2 to 16-bit mul v12.8h, v12.8h , v2.8h //weight 1 mult. for row 2H mla v12.8h, v14.8h , v4.8h //weight 2 mult. for row 2H uxtl v16.8h, v17.8b //converting row 3H in source 1 to 16-bit uxtl v18.8h, v19.8b //converting row 3H in source 2 to 16-bit mul v26.8h, v26.8h , v2.8h //weight 1 mult. for row 3L mla v26.8h, v10.8h , v4.8h //weight 2 mult. for row 3L uxtl v30.8h, v20.8b //converting row 4L in source 1 to 16-bit uxtl v14.8h, v22.8b //converting row 4L in source 2 to 16-bit mul v16.8h, v16.8h , v2.8h //weight 1 mult. for row 3H mla v16.8h, v18.8h , v4.8h //weight 2 mult. for row 3H uxtl v20.8h, v21.8b //converting row 4H in source 1 to 16-bit uxtl v22.8h, v23.8b //converting row 4H in source 2 to 16-bit mul v30.8h, v30.8h , v2.8h //weight 1 mult. for row 4L mla v30.8h, v14.8h , v4.8h //weight 2 mult. for row 4L srshl v24.8h, v24.8h , v0.8h //rounds off the weighted samples from row 1L mul v20.8h, v20.8h , v2.8h //weight 1 mult. for row 4H mla v20.8h, v22.8h , v4.8h //weight 2 mult. for row 4H srshl v8.8h, v8.8h , v0.8h //rounds off the weighted samples from row 1H srshl v28.8h, v28.8h , v0.8h //rounds off the weighted samples from row 2L add v24.8h, v24.8h , v6.8h //adding offset for row 1L srshl v12.8h, v12.8h , v0.8h //rounds off the weighted samples from row 2H add v8.8h, v8.8h , v6.8h //adding offset for row 1H srshl v26.8h, v26.8h , v0.8h //rounds off the weighted samples from row 3L add v28.8h, v28.8h , v6.8h //adding offset for row 2L srshl v16.8h, v16.8h , v0.8h //rounds off the weighted samples from row 3H add v12.8h, v12.8h , v6.8h //adding offset for row 2H srshl v30.8h, v30.8h , v0.8h //rounds off the weighted samples from row 4L add v26.8h, v26.8h , v6.8h //adding offset for row 3L srshl v20.8h, v20.8h , v0.8h //rounds off the weighted samples from row 4H add v16.8h, v16.8h , v6.8h //adding offset for row 3H sqxtun v10.8b, v24.8h //saturating row 1L to unsigned 8-bit add v30.8h, v30.8h , v6.8h //adding offset for row 4L sqxtun v11.8b, v8.8h //saturating row 1H to unsigned 8-bit add v20.8h, v20.8h , v6.8h //adding offset for row 4H sqxtun v18.8b, v28.8h //saturating row 2L to unsigned 8-bit sqxtun v19.8b, v12.8h //saturating row 2H to unsigned 8-bit sqxtun v14.8b, v26.8h //saturating row 3L to unsigned 8-bit sqxtun v15.8b, v16.8h //saturating row 3H to unsigned 8-bit st1 {v10.8b, v11.8b}, [x2], x5 //store row 1 in destination sqxtun v22.8b, v30.8h //saturating row 4L to unsigned 8-bit sqxtun v23.8b, v20.8h //saturating row 4H to unsigned 8-bit st1 {v18.8b, v19.8b}, [x2], x5 //store row 2 in destination subs w11, w11, #4 //decrement ht by 4 st1 {v14.8b, v15.8b}, [x2], x5 //store row 3 in destination st1 {v22.8b, v23.8b}, [x2], x5 //store row 4 in destination bgt loop_8_uv //if greater than 0 repeat the loop again end_loops_uv: // LDMFD sp!,{x4-x12,x15} //Reload the registers from sp ldp x19, x20, [sp], #16 pop_v_regs ret