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/* -*-arm64-*-
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* vim: syntax=arm64asm
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*
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* AArch64 NEON optimised SAO functions for HEVC decoding
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*
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* Copyright (c) 2020 Josh Dekker <josh@itanimul.li>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/aarch64/asm.S"
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// void sao_band_filter(uint8_t *_dst, uint8_t *_src,
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// ptrdiff_t stride_dst, ptrdiff_t stride_src,
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// int16_t *sao_offset_val, int sao_left_class,
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// int width, int height)
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function ff_hevc_sao_band_filter_8x8_8_neon, export=1
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sub sp, sp, #64
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stp xzr, xzr, [sp]
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stp xzr, xzr, [sp, #16]
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stp xzr, xzr, [sp, #32]
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stp xzr, xzr, [sp, #48]
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mov w8, #4
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0: ldrsh x9, [x4, x8, lsl #1] // sao_offset_val[k+1]
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subs w8, w8, #1
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add w10, w8, w5 // k + sao_left_class
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and w10, w10, #0x1F
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strh w9, [sp, x10, lsl #1]
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bne 0b
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ld1 {v16.16b-v19.16b}, [sp], #64
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movi v20.8h, #1
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1: mov w8, w6 // beginning of line
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2: // Simple layout for accessing 16bit values
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// with 8bit LUT.
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//
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// 00 01 02 03 04 05 06 07
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// +----------------------------------->
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// |xDE#xAD|xCA#xFE|xBE#xEF|xFE#xED|....
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// +----------------------------------->
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// i-0 i-1 i-2 i-3
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ld1 {v2.8b}, [x1] // dst[x] = av_clip_pixel(src[x] + offset_table[src[x] >> shift]);
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uxtl v0.8h, v2.8b // load src[x]
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ushr v2.8h, v0.8h, #3 // >> BIT_DEPTH - 3
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shl v1.8h, v2.8h, #1 // low (x2, accessing short)
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add v3.8h, v1.8h, v20.8h // +1 access upper short
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sli v1.8h, v3.8h, #8 // shift insert index to upper byte
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tbx v2.16b, {v16.16b-v19.16b}, v1.16b // table
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add v1.8h, v0.8h, v2.8h // src[x] + table
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sqxtun v4.8b, v1.8h // clip + narrow
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st1 {v4.8b}, [x0] // store
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subs w8, w8, #8 // done 8 pixels
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bne 2b
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subs w7, w7, #1 // finished line, prep. new
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add x0, x0, x2 // dst += stride_dst
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add x1, x1, x3 // src += stride_src
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bne 1b
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ret
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endfunc
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