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/*
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* Copyright (c) 2022 Jonathan Swinney <jswinney@amazon.com>
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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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function ff_pix_abs16_neon, export=1
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// x0 unused
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// x1 uint8_t *pix1
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// x2 uint8_t *pix2
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// x3 ptrdiff_t stride
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// w4 int h
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cmp w4, #4 // if h < 4, jump to completion section
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movi v18.4S, #0 // clear result accumulator
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b.lt 2f
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1:
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ld1 {v0.16b}, [x1], x3 // load pix1
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ld1 {v4.16b}, [x2], x3 // load pix2
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ld1 {v1.16b}, [x1], x3 // load pix1
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ld1 {v5.16b}, [x2], x3 // load pix2
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uabdl v16.8h, v0.8b, v4.8b // absolute difference accumulate
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uabdl2 v17.8h, v0.16b, v4.16b
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ld1 {v2.16b}, [x1], x3 // load pix1
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ld1 {v6.16b}, [x2], x3 // load pix2
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uabal v16.8h, v1.8b, v5.8b // absolute difference accumulate
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uabal2 v17.8h, v1.16b, v5.16b
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ld1 {v3.16b}, [x1], x3
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ld1 {v7.16b}, [x2], x3
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uabal v16.8h, v2.8b, v6.8b
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uabal2 v17.8h, v2.16b, v6.16b
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sub w4, w4, #4 // h -= 4
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uabal v16.8h, v3.8b, v7.8b
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uabal2 v17.8h, v3.16b, v7.16b
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cmp w4, #4 // if h >= 4, loop
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add v16.8h, v16.8h, v17.8h
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uaddlv s16, v16.8h // add up everything in v16 accumulator
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add d18, d16, d18 // add to the end result register
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b.ge 1b
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cbnz w4, 2f // if iterations remain, jump to completion section
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fmov w0, s18 // copy result to general purpose register
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ret
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2:
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ld1 {v0.16b}, [x1], x3 // load pix1
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ld1 {v4.16b}, [x2], x3 // load pix2
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uabdl v16.8h, v0.8b, v4.8b // absolute difference accumulate
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uabal2 v16.8h, v0.16b, v4.16b
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subs w4, w4, #1 // h -= 1
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addv h16, v16.8h // add up v16
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add d18, d16, d18 // add to result
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b.ne 2b
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fmov w0, s18 // copy result to general purpose register
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ret
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endfunc
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function ff_pix_abs16_xy2_neon, export=1
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// x0 unused
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// x1 uint8_t *pix1
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// x2 uint8_t *pix2
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// x3 ptrdiff_t stride
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// w4 int h
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add x5, x2, x3 // use x5 to hold uint8_t *pix3
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movi v0.2d, #0 // initialize the result register
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// Load initial pix2 values for either the unrolled version or completion version.
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ldur q4, [x2, #1] // load pix2+1
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ldr q3, [x2] // load pix2
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uaddl v2.8h, v4.8b, v3.8b // pix2 + pix2+1 0..7
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uaddl2 v3.8h, v4.16b, v3.16b // pix2 + pix2+1 8..15
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cmp w4, #4 // if h < 4 jump to the completion version
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b.lt 2f
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1:
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// This is an unrolled implementation. It completes 4 iterations of the C for each branch.
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// In each iteration, pix2[i+1] == pix3[i]. This means we need only three loads per iteration,
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// plus two at the beginning to start.
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ldur q5, [x5, #1] // load pix3+1
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ld1 {v4.16b}, [x5], x3 // load pix3
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ld1 {v1.16b}, [x1], x3 // load pix1
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ldur q7, [x5, #1] // load pix3+1
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ld1 {v6.16b}, [x5], x3 // load pix3
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ld1 {v16.16b}, [x1], x3 // load pix1
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// These blocks compute the average: avg(pix2[n], pix2[n+1], pix3[n], pix3[n+1])
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uaddl v30.8h, v4.8b, v5.8b // pix3 + pix3+1 0..7
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uaddl2 v31.8h, v4.16b, v5.16b // pix3 + pix3+1 8..15
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ldur q19, [x5, #1] // load pix3+1
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add v23.8h, v2.8h, v30.8h // add up 0..7, using pix2 + pix2+1 values from previous iteration
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add v24.8h, v3.8h, v31.8h // add up 8..15, using pix2 + pix2+1 values from previous iteration
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ld1 {v18.16b}, [x5], x3 // load pix3
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ld1 {v17.16b}, [x1], x3 // load pix1
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rshrn v23.8b, v23.8h, #2 // shift right 2 0..7 (rounding shift right)
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rshrn2 v23.16b, v24.8h, #2 // shift right 2 8..15
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uaddl v2.8h, v6.8b, v7.8b // pix3 + pix3+1 0..7
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uaddl2 v3.8h, v6.16b, v7.16b // pix3 + pix3+1 8..15
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ldur q22, [x5, #1] // load pix3+1
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add v26.8h, v30.8h, v2.8h // add up 0..7, using pix2 + pix2+1 values from pix3 above
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add v27.8h, v31.8h, v3.8h // add up 8..15, using pix2 + pix2+1 values from pix3 above
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uabdl v24.8h, v1.8b, v23.8b // absolute difference 0..7, i=0
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uabdl2 v23.8h, v1.16b, v23.16b // absolute difference 8..15, i=0
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ld1 {v21.16b}, [x5], x3 // load pix3
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ld1 {v20.16b}, [x1], x3 // load pix1
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rshrn v26.8b, v26.8h, #2 // shift right 2 0..7 (rounding shift right)
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rshrn2 v26.16b, v27.8h, #2 // shift right 2 8..15
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uaddl v4.8h, v18.8b, v19.8b // pix3 + pix3+1 0..7
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uaddl2 v5.8h, v18.16b, v19.16b // pix3 + pix3+1 8..15
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add v28.8h, v2.8h, v4.8h // add up 0..7, using pix2 + pix2+1 values from pix3 above
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add v29.8h, v3.8h, v5.8h // add up 8..15, using pix2 + pix2+1 values from pix3 above
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rshrn v28.8b, v28.8h, #2 // shift right 2 0..7 (rounding shift right)
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rshrn2 v28.16b, v29.8h, #2 // shift right 2 8..15
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uabal v24.8h, v16.8b, v26.8b // absolute difference 0..7, i=1
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uabal2 v23.8h, v16.16b, v26.16b // absolute difference 8..15, i=1
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uaddl v2.8h, v21.8b, v22.8b // pix3 + pix3+1 0..7
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uaddl2 v3.8h, v21.16b, v22.16b // pix3 + pix3+1 8..15
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add v30.8h, v4.8h, v2.8h // add up 0..7, using pix2 + pix2+1 values from pix3 above
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add v31.8h, v5.8h, v3.8h // add up 8..15, using pix2 + pix2+1 values from pix3 above
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rshrn v30.8b, v30.8h, #2 // shift right 2 0..7 (rounding shift right)
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rshrn2 v30.16b, v31.8h, #2 // shift right 2 8..15
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uabal v24.8h, v17.8b, v28.8b // absolute difference 0..7, i=2
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uabal2 v23.8h, v17.16b, v28.16b // absolute difference 8..15, i=2
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sub w4, w4, #4 // h -= 4
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uabal v24.8h, v20.8b, v30.8b // absolute difference 0..7, i=3
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uabal2 v23.8h, v20.16b, v30.16b // absolute difference 8..15, i=3
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cmp w4, #4 // loop if h >= 4
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add v4.8h, v23.8h, v24.8h
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uaddlv s4, v4.8h // finish adding up accumulated values
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add d0, d0, d4 // add the value to the top level accumulator
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b.ge 1b
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cbnz w4, 2f // if iterations remain jump to completion section
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fmov w0, s0 // copy result to general purpose register
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ret
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2:
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// v2 and v3 are set either at the end of this loop or at from the unrolled version
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// which branches here to complete iterations when h % 4 != 0.
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ldur q5, [x5, #1] // load pix3+1
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ld1 {v4.16b}, [x5], x3 // load pix3
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ld1 {v1.16b}, [x1], x3 // load pix1
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subs w4, w4, #1 // decrement h
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uaddl v18.8h, v4.8b, v5.8b // pix3 + pix3+1 0..7
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uaddl2 v19.8h, v4.16b, v5.16b // pix3 + pix3+1 8..15
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add v16.8h, v2.8h, v18.8h // add up 0..7, using pix2 + pix2+1 values from previous iteration
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add v17.8h, v3.8h, v19.8h // add up 8..15, using pix2 + pix2+1 values from previous iteration
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// divide by 4 to compute the average of values summed above
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urshr v16.8h, v16.8h, #2 // shift right by 2 0..7 (rounding shift right)
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urshr v17.8h, v17.8h, #2 // shift right by 2 8..15
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uxtl2 v7.8h, v1.16b // 8->16 bits pix1 8..15
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uxtl v1.8h, v1.8b // 8->16 bits pix1 0..7
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uabd v6.8h, v1.8h, v16.8h // absolute difference 0..7
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uaba v6.8h, v7.8h, v17.8h // absolute difference accumulate 8..15
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mov v2.16b, v18.16b // pix3 -> pix2
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mov v3.16b, v19.16b // pix3+1 -> pix2+1
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uaddlv s6, v6.8h // add up accumulator in v6
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add d0, d0, d6 // add to the final result
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b.ne 2b // loop if h > 0
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fmov w0, s0 // copy result to general purpose register
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ret
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endfunc
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function ff_pix_abs16_x2_neon, export=1
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// x0 unused
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// x1 uint8_t *pix1
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// x2 uint8_t *pix2
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// x3 ptrdiff_t stride
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// w4 int h
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cmp w4, #4
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// initialize buffers
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movi d20, #0
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add x5, x2, #1 // pix2 + 1
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b.lt 2f
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// make 4 iterations at once
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1:
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// abs(pix1[0] - avg2(pix2[0], pix2[1]))
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// avg2(a,b) = (((a) + (b) + 1) >> 1)
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// abs(x) = (x < 0 ? -x : x)
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ld1 {v1.16b}, [x2], x3
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ld1 {v2.16b}, [x5], x3
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urhadd v30.16b, v1.16b, v2.16b
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ld1 {v0.16b}, [x1], x3
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uabdl v16.8h, v0.8b, v30.8b
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ld1 {v4.16b}, [x2], x3
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uabdl2 v17.8h, v0.16b, v30.16b
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ld1 {v5.16b}, [x5], x3
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urhadd v29.16b, v4.16b, v5.16b
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ld1 {v3.16b}, [x1], x3
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uabal v16.8h, v3.8b, v29.8b
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ld1 {v7.16b}, [x2], x3
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uabal2 v17.8h, v3.16b, v29.16b
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ld1 {v22.16b}, [x5], x3
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urhadd v28.16b, v7.16b, v22.16b
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ld1 {v6.16b}, [x1], x3
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uabal v16.8h, v6.8b, v28.8b
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ld1 {v24.16b}, [x2], x3
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uabal2 v17.8h, v6.16b, v28.16b
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ld1 {v25.16b}, [x5], x3
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urhadd v27.16b, v24.16b, v25.16b
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ld1 {v23.16b}, [x1], x3
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uabal v16.8h, v23.8b, v27.8b
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uabal2 v17.8h, v23.16b, v27.16b
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sub w4, w4, #4
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add v16.8h, v16.8h, v17.8h
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uaddlv s16, v16.8h
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cmp w4, #4
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add d20, d20, d16
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b.ge 1b
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cbz w4, 3f
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// iterate by one
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2:
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ld1 {v1.16b}, [x2], x3
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ld1 {v2.16b}, [x5], x3
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urhadd v29.16b, v1.16b, v2.16b
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ld1 {v0.16b}, [x1], x3
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uabd v28.16b, v0.16b, v29.16b
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uaddlv h28, v28.16b
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subs w4, w4, #1
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add d20, d20, d28
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b.ne 2b
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3:
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fmov w0, s20
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ret
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endfunc
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