/* * Copyright (c) 2022 Jonathan Swinney * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/aarch64/asm.S" function ff_pix_abs16_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h cmp w4, #4 // if h < 4, jump to completion section movi v16.8h, #0 // clear result accumulator movi v17.8h, #0 // clear result accumulator b.lt 2f 1: ld1 {v0.16b}, [x1], x3 // load pix1 ld1 {v4.16b}, [x2], x3 // load pix2 ld1 {v1.16b}, [x1], x3 // load pix1 ld1 {v5.16b}, [x2], x3 // load pix2 uabal v16.8h, v0.8b, v4.8b // absolute difference accumulate uabal2 v17.8h, v0.16b, v4.16b ld1 {v2.16b}, [x1], x3 // load pix1 ld1 {v6.16b}, [x2], x3 // load pix2 uabal v16.8h, v1.8b, v5.8b // absolute difference accumulate uabal2 v17.8h, v1.16b, v5.16b ld1 {v3.16b}, [x1], x3 ld1 {v7.16b}, [x2], x3 uabal v16.8h, v2.8b, v6.8b uabal2 v17.8h, v2.16b, v6.16b sub w4, w4, #4 // h -= 4 uabal v16.8h, v3.8b, v7.8b uabal2 v17.8h, v3.16b, v7.16b cmp w4, #4 // if h >= 4, loop b.ge 1b cbnz w4, 2f // if iterations remain, jump to completion section add v16.8h, v16.8h, v17.8h uaddlv s16, v16.8h // add up everything in v16 accumulator fmov w0, s16 // copy result to general purpose register ret 2: ld1 {v0.16b}, [x1], x3 // load pix1 ld1 {v4.16b}, [x2], x3 // load pix2 subs w4, w4, #1 // h -= 1 uabal v16.8h, v0.8b, v4.8b // absolute difference accumulate uabal2 v17.8h, v0.16b, v4.16b b.ne 2b add v16.8h, v16.8h, v17.8h uaddlv s16, v16.8h // add up everything in v16 accumulator fmov w0, s16 // copy result to general purpose register ret endfunc function ff_pix_abs8_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h movi v30.8h, #0 cmp w4, #4 b.lt 2f // make 4 iterations at once 1: ld1 {v0.8b}, [x1], x3 // Load pix1 for first iteration ld1 {v1.8b}, [x2], x3 // Load pix2 for first iteration ld1 {v2.8b}, [x1], x3 // Load pix1 for second iteration uabal v30.8h, v0.8b, v1.8b // Absolute difference, first iteration ld1 {v3.8b}, [x2], x3 // Load pix2 for second iteration ld1 {v4.8b}, [x1], x3 // Load pix1 for third iteration uabal v30.8h, v2.8b, v3.8b // Absolute difference, second iteration ld1 {v5.8b}, [x2], x3 // Load pix2 for third iteration sub w4, w4, #4 // h -= 4 ld1 {v6.8b}, [x1], x3 // Load pix1 for foruth iteration ld1 {v7.8b}, [x2], x3 // Load pix2 for fourth iteration uabal v30.8h, v4.8b, v5.8b // Absolute difference, third iteration cmp w4, #4 uabal v30.8h, v6.8b, v7.8b // Absolute difference, foruth iteration b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v0.8b}, [x1], x3 // Load pix1 ld1 {v1.8b}, [x2], x3 // Load pix2 subs w4, w4, #1 uabal v30.8h, v0.8b, v1.8b b.ne 2b 3: uaddlv s20, v30.8h // Add up vector fmov w0, s20 ret endfunc function ff_pix_abs8_x2_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h cmp w4, #4 movi v26.8h, #0 add x5, x2, #1 // pix2 + 1 b.lt 2f // make 4 iterations at once 1: ld1 {v1.8b}, [x2], x3 ld1 {v2.8b}, [x5], x3 ld1 {v0.8b}, [x1], x3 ld1 {v4.8b}, [x2], x3 urhadd v30.8b, v1.8b, v2.8b ld1 {v5.8b}, [x5], x3 uabal v26.8h, v0.8b, v30.8b ld1 {v6.8b}, [x1], x3 urhadd v29.8b, v4.8b, v5.8b ld1 {v7.8b}, [x2], x3 ld1 {v20.8b}, [x5], x3 uabal v26.8h, v6.8b, v29.8b ld1 {v21.8b}, [x1], x3 urhadd v28.8b, v7.8b, v20.8b ld1 {v22.8b}, [x2], x3 ld1 {v23.8b}, [x5], x3 uabal v26.8h, v21.8b, v28.8b sub w4, w4, #4 ld1 {v24.8b}, [x1], x3 urhadd v27.8b, v22.8b, v23.8b cmp w4, #4 uabal v26.8h, v24.8b, v27.8b b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v1.8b}, [x2], x3 ld1 {v2.8b}, [x5], x3 ld1 {v0.8b}, [x1], x3 urhadd v30.8b, v1.8b, v2.8b subs w4, w4, #1 uabal v26.8h, v0.8b, v30.8b b.ne 2b 3: uaddlv s20, v26.8h fmov w0, s20 ret endfunc function ff_pix_abs8_y2_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h cmp w4, #4 movi v26.8h, #0 ld1 {v1.8b}, [x2], x3 b.lt 2f // make 4 iterations at once 1: ld1 {v2.8b}, [x2], x3 ld1 {v0.8b}, [x1], x3 urhadd v30.8b, v1.8b, v2.8b ld1 {v5.8b}, [x2], x3 ld1 {v6.8b}, [x1], x3 uabal v26.8h, v0.8b, v30.8b urhadd v29.8b, v2.8b, v5.8b ld1 {v20.8b}, [x2], x3 ld1 {v21.8b}, [x1], x3 uabal v26.8h, v6.8b, v29.8b urhadd v28.8b, v5.8b, v20.8b ld1 {v1.8b}, [x2], x3 ld1 {v24.8b}, [x1], x3 urhadd v27.8b, v20.8b, v1.8b sub w4, w4, #4 uabal v26.8h, v21.8b, v28.8b cmp w4, #4 uabal v26.8h, v24.8b, v27.8b b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v0.8b}, [x1], x3 ld1 {v2.8b}, [x2], x3 urhadd v30.8b, v1.8b, v2.8b subs w4, w4, #1 uabal v26.8h, v0.8b, v30.8b mov v1.8b, v2.8b b.ne 2b 3: uaddlv s20, v26.8h fmov w0, s20 ret endfunc function ff_pix_abs8_xy2_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h movi v31.8h, #0 add x0, x2, 1 // pix2 + 1 add x5, x2, x3 // pix2 + stride = pix3 cmp w4, #4 add x6, x5, 1 // pix3 + stride + 1 ld1 {v0.8b}, [x2], x3 ld1 {v1.8b}, [x0], x3 uaddl v2.8h, v0.8b, v1.8b b.lt 2f // make 4 iterations at once 1: ld1 {v4.8b}, [x5], x3 ld1 {v5.8b}, [x6], x3 ld1 {v7.8b}, [x5], x3 uaddl v0.8h, v4.8b, v5.8b ld1 {v16.8b}, [x6], x3 add v4.8h, v0.8h, v2.8h ld1 {v5.8b}, [x1], x3 rshrn v4.8b, v4.8h, #2 uaddl v7.8h, v7.8b, v16.8b uabal v31.8h, v5.8b, v4.8b add v2.8h, v0.8h, v7.8h ld1 {v17.8b}, [x1], x3 rshrn v2.8b, v2.8h, #2 ld1 {v20.8b}, [x5], x3 uabal v31.8h, v17.8b, v2.8b ld1 {v21.8b}, [x6], x3 ld1 {v25.8b}, [x5], x3 uaddl v20.8h, v20.8b, v21.8b ld1 {v26.8b}, [x6], x3 add v7.8h, v7.8h, v20.8h uaddl v25.8h, v25.8b, v26.8b rshrn v7.8b, v7.8h, #2 ld1 {v22.8b}, [x1], x3 mov v2.16b, v25.16b uabal v31.8h, v22.8b, v7.8b add v20.8h, v20.8h, v25.8h ld1 {v27.8b}, [x1], x3 sub w4, w4, #4 rshrn v20.8b, v20.8h, #2 cmp w4, #4 uabal v31.8h, v27.8b, v20.8b b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v0.8b}, [x5], x3 ld1 {v1.8b}, [x6], x3 ld1 {v4.8b}, [x1], x3 uaddl v21.8h, v0.8b, v1.8b subs w4, w4, #1 add v3.8h, v2.8h, v21.8h mov v2.16b, v21.16b rshrn v3.8b, v3.8h, #2 uabal v31.8h, v4.8b, v3.8b b.ne 2b 3: uaddlv s18, v31.8h fmov w0, s18 ret endfunc function ff_pix_abs16_xy2_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h add x5, x2, x3 // use x5 to hold uint8_t *pix3 movi v21.8h, #0 // initialize the result register movi v22.8h, #0 // initialize the result register // Load initial pix2 values for either the unrolled version or completion version. ldur q4, [x2, #1] // load pix2+1 ldr q3, [x2] // load pix2 uaddl v2.8h, v4.8b, v3.8b // pix2 + pix2+1 0..7 uaddl2 v3.8h, v4.16b, v3.16b // pix2 + pix2+1 8..15 cmp w4, #4 // if h < 4 jump to the completion version b.lt 2f 1: // This is an unrolled implementation. It completes 4 iterations of the C for each branch. // In each iteration, pix2[i+1] == pix3[i]. This means we need only three loads per iteration, // plus two at the beginning to start. ldur q5, [x5, #1] // load pix3+1 ld1 {v4.16b}, [x5], x3 // load pix3 ld1 {v1.16b}, [x1], x3 // load pix1 ldur q7, [x5, #1] // load pix3+1 ld1 {v6.16b}, [x5], x3 // load pix3 ld1 {v16.16b}, [x1], x3 // load pix1 // These blocks compute the average: avg(pix2[n], pix2[n+1], pix3[n], pix3[n+1]) uaddl v30.8h, v4.8b, v5.8b // pix3 + pix3+1 0..7 uaddl2 v31.8h, v4.16b, v5.16b // pix3 + pix3+1 8..15 ldur q19, [x5, #1] // load pix3+1 add v23.8h, v2.8h, v30.8h // add up 0..7, using pix2 + pix2+1 values from previous iteration add v24.8h, v3.8h, v31.8h // add up 8..15, using pix2 + pix2+1 values from previous iteration ld1 {v18.16b}, [x5], x3 // load pix3 ld1 {v17.16b}, [x1], x3 // load pix1 rshrn v23.8b, v23.8h, #2 // shift right 2 0..7 (rounding shift right) rshrn2 v23.16b, v24.8h, #2 // shift right 2 8..15 uaddl v2.8h, v6.8b, v7.8b // pix3 + pix3+1 0..7 uaddl2 v3.8h, v6.16b, v7.16b // pix3 + pix3+1 8..15 ldur q7, [x5, #1] // load pix3+1 add v26.8h, v30.8h, v2.8h // add up 0..7, using pix2 + pix2+1 values from pix3 above add v27.8h, v31.8h, v3.8h // add up 8..15, using pix2 + pix2+1 values from pix3 above uabal v21.8h, v1.8b, v23.8b // absolute difference 0..7, i=0 uabal2 v22.8h, v1.16b, v23.16b // absolute difference 8..15, i=0 ld1 {v6.16b}, [x5], x3 // load pix3 ld1 {v20.16b}, [x1], x3 // load pix1 rshrn v26.8b, v26.8h, #2 // shift right 2 0..7 (rounding shift right) rshrn2 v26.16b, v27.8h, #2 // shift right 2 8..15 uaddl v4.8h, v18.8b, v19.8b // pix3 + pix3+1 0..7 uaddl2 v5.8h, v18.16b, v19.16b // pix3 + pix3+1 8..15 add v28.8h, v2.8h, v4.8h // add up 0..7, using pix2 + pix2+1 values from pix3 above add v29.8h, v3.8h, v5.8h // add up 8..15, using pix2 + pix2+1 values from pix3 above rshrn v28.8b, v28.8h, #2 // shift right 2 0..7 (rounding shift right) rshrn2 v28.16b, v29.8h, #2 // shift right 2 8..15 uabal v21.8h, v16.8b, v26.8b // absolute difference 0..7, i=1 uabal2 v22.8h, v16.16b, v26.16b // absolute difference 8..15, i=1 uaddl v2.8h, v6.8b, v7.8b // pix3 + pix3+1 0..7 uaddl2 v3.8h, v6.16b, v7.16b // pix3 + pix3+1 8..15 add v30.8h, v4.8h, v2.8h // add up 0..7, using pix2 + pix2+1 values from pix3 above add v31.8h, v5.8h, v3.8h // add up 8..15, using pix2 + pix2+1 values from pix3 above rshrn v30.8b, v30.8h, #2 // shift right 2 0..7 (rounding shift right) rshrn2 v30.16b, v31.8h, #2 // shift right 2 8..15 sub w4, w4, #4 // h -= 4 uabal v21.8h, v17.8b, v28.8b // absolute difference 0..7, i=2 uabal2 v22.8h, v17.16b, v28.16b // absolute difference 8..15, i=2 cmp w4, #4 // loop if h >= 4 uabal v21.8h, v20.8b, v30.8b // absolute difference 0..7, i=3 uabal2 v22.8h, v20.16b, v30.16b // absolute difference 8..15, i=3 b.ge 1b cbnz w4, 2f // if iterations remain jump to completion section add v4.8h, v21.8h, v22.8h uaddlv s0, v4.8h // finish adding up accumulated values fmov w0, s0 // copy result to general purpose register ret 2: // v2 and v3 are set either at the end of this loop or at from the unrolled version // which branches here to complete iterations when h % 4 != 0. ldur q5, [x5, #1] // load pix3+1 ld1 {v4.16b}, [x5], x3 // load pix3 ld1 {v1.16b}, [x1], x3 // load pix1 subs w4, w4, #1 // decrement h uaddl v18.8h, v4.8b, v5.8b // pix3 + pix3+1 0..7 uaddl2 v19.8h, v4.16b, v5.16b // pix3 + pix3+1 8..15 add v16.8h, v2.8h, v18.8h // add up 0..7, using pix2 + pix2+1 values from previous iteration add v17.8h, v3.8h, v19.8h // add up 8..15, using pix2 + pix2+1 values from previous iteration // divide by 4 to compute the average of values summed above rshrn v16.8b, v16.8h, #2 // shift right by 2 0..7 (rounding shift right) rshrn2 v16.16b, v17.8h, #2 // shift right by 2 8..15 uabal v21.8h, v1.8b, v16.8b // absolute difference 0..7 uabal2 v22.8h, v1.16b, v16.16b // absolute difference accumulate 8..15 mov v2.16b, v18.16b // pix3 -> pix2 mov v3.16b, v19.16b // pix3+1 -> pix2+1 b.ne 2b // loop if h > 0 add v4.8h, v21.8h, v22.8h uaddlv s0, v4.8h // finish adding up accumulated values fmov w0, s0 // copy result to general purpose register ret endfunc function ff_pix_abs16_x2_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h cmp w4, #4 // initialize buffers movi v16.8h, #0 movi v17.8h, #0 add x5, x2, #1 // pix2 + 1 b.lt 2f // make 4 iterations at once 1: // abs(pix1[0] - avg2(pix2[0], pix2[1])) // avg2(a,b) = (((a) + (b) + 1) >> 1) // abs(x) = (x < 0 ? -x : x) ld1 {v1.16b}, [x2], x3 ld1 {v2.16b}, [x5], x3 urhadd v30.16b, v1.16b, v2.16b ld1 {v0.16b}, [x1], x3 uabal v16.8h, v0.8b, v30.8b ld1 {v4.16b}, [x2], x3 uabal2 v17.8h, v0.16b, v30.16b ld1 {v5.16b}, [x5], x3 urhadd v29.16b, v4.16b, v5.16b ld1 {v3.16b}, [x1], x3 uabal v16.8h, v3.8b, v29.8b ld1 {v7.16b}, [x2], x3 uabal2 v17.8h, v3.16b, v29.16b ld1 {v22.16b}, [x5], x3 urhadd v28.16b, v7.16b, v22.16b ld1 {v6.16b}, [x1], x3 uabal v16.8h, v6.8b, v28.8b ld1 {v24.16b}, [x2], x3 sub w4, w4, #4 uabal2 v17.8h, v6.16b, v28.16b ld1 {v25.16b}, [x5], x3 urhadd v27.16b, v24.16b, v25.16b ld1 {v23.16b}, [x1], x3 cmp w4, #4 uabal v16.8h, v23.8b, v27.8b uabal2 v17.8h, v23.16b, v27.16b b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v1.16b}, [x2], x3 ld1 {v2.16b}, [x5], x3 subs w4, w4, #1 urhadd v29.16b, v1.16b, v2.16b ld1 {v0.16b}, [x1], x3 uabal v16.8h, v0.8b, v29.8b uabal2 v17.8h, v0.16b, v29.16b b.ne 2b 3: add v16.8h, v16.8h, v17.8h uaddlv s16, v16.8h fmov w0, s16 ret endfunc function ff_pix_abs16_y2_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h // initialize buffers ld1 {v1.16b}, [x2], x3 // Load pix2 movi v29.8h, #0 // clear the accumulator movi v28.8h, #0 // clear the accumulator cmp w4, #4 b.lt 2f // make 4 iterations at once 1: // abs(pix1[0], avg2(pix2[0], pix2[0 + stride])) // avg2(a, b) = (((a) + (b) + 1) >> 1) // abs(x) = (x < 0 ? (-x) : (x)) ld1 {v2.16b}, [x2], x3 // Load pix3 for first iteration ld1 {v0.16b}, [x1], x3 // Load pix1 for first iteration urhadd v30.16b, v1.16b, v2.16b // Rounding halving add, first iteration ld1 {v5.16b}, [x2], x3 // Load pix3 for second iteartion uabal v29.8h, v0.8b, v30.8b // Absolute difference of lower half, first iteration uabal2 v28.8h, v0.16b, v30.16b // Absolute difference of upper half, first iteration ld1 {v3.16b}, [x1], x3 // Load pix1 for second iteration urhadd v27.16b, v2.16b, v5.16b // Rounding halving add, second iteration ld1 {v20.16b}, [x2], x3 // Load pix3 for third iteration uabal v29.8h, v3.8b, v27.8b // Absolute difference of lower half for second iteration uabal2 v28.8h, v3.16b, v27.16b // Absolute difference of upper half for second iteration ld1 {v6.16b}, [x1], x3 // Load pix1 for third iteration urhadd v26.16b, v5.16b, v20.16b // Rounding halving add, third iteration ld1 {v1.16b}, [x2], x3 // Load pix3 for fourth iteration uabal v29.8h, v6.8b, v26.8b // Absolute difference of lower half for third iteration uabal2 v28.8h, v6.16b, v26.16b // Absolute difference of upper half for third iteration ld1 {v21.16b}, [x1], x3 // Load pix1 for fourth iteration sub w4, w4, #4 // h-= 4 urhadd v25.16b, v20.16b, v1.16b // Rounding halving add cmp w4, #4 uabal v29.8h, v21.8b, v25.8b // Absolute difference of lower half for fourth iteration uabal2 v28.8h, v21.16b, v25.16b // Absolute difference of upper half for fourth iteration b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v2.16b}, [x2], x3 // Load pix3 subs w4, w4, #1 ld1 {v0.16b}, [x1], x3 // Load pix1 urhadd v30.16b, v1.16b, v2.16b // Rounding halving add mov v1.16b, v2.16b // Shift pix3->pix2 uabal v29.8h, v30.8b, v0.8b uabal2 v28.8h, v30.16b, v0.16b b.ne 2b 3: add v29.8h, v29.8h, v28.8h // Add vectors together uaddlv s16, v29.8h // Add up vector values fmov w0, s16 ret endfunc function sse16_neon, export=1 // x0 - unused // x1 - pix1 // x2 - pix2 // x3 - stride // w4 - h cmp w4, #4 movi v17.4s, #0 b.lt 2f // Make 4 iterations at once 1: // res = abs(pix1[0] - pix2[0]) // res * res ld1 {v0.16b}, [x1], x3 // Load pix1 vector for first iteration ld1 {v1.16b}, [x2], x3 // Load pix2 vector for first iteration ld1 {v2.16b}, [x1], x3 // Load pix1 vector for second iteration uabd v30.16b, v0.16b, v1.16b // Absolute difference, first iteration ld1 {v3.16b}, [x2], x3 // Load pix2 vector for second iteration umull v29.8h, v30.8b, v30.8b // Multiply lower half of vectors, first iteration umull2 v28.8h, v30.16b, v30.16b // Multiply upper half of vectors, first iteration uabd v27.16b, v2.16b, v3.16b // Absolute difference, second iteration uadalp v17.4s, v29.8h // Pairwise add, first iteration ld1 {v4.16b}, [x1], x3 // Load pix1 for third iteration umull v26.8h, v27.8b, v27.8b // Mulitply lower half, second iteration umull2 v25.8h, v27.16b, v27.16b // Multiply upper half, second iteration ld1 {v5.16b}, [x2], x3 // Load pix2 for third iteration uadalp v17.4s, v26.8h // Pairwise add and accumulate, second iteration uabd v24.16b, v4.16b, v5.16b // Absolute difference, third iteration ld1 {v6.16b}, [x1], x3 // Load pix1 for fourth iteration uadalp v17.4s, v25.8h // Pairwise add and accumulate, second iteration umull v23.8h, v24.8b, v24.8b // Multiply lower half, third iteration umull2 v22.8h, v24.16b, v24.16b // Multiply upper half, third iteration uadalp v17.4s, v23.8h // Pairwise add and accumulate, third iteration ld1 {v7.16b}, [x2], x3 // Load pix2 for fouth iteration uadalp v17.4s, v22.8h // Pairwise add and accumulate, third iteration uabd v21.16b, v6.16b, v7.16b // Absolute difference, fourth iteration uadalp v17.4s, v28.8h // Pairwise add and accumulate, first iteration umull v20.8h, v21.8b, v21.8b // Multiply lower half, fourth iteration sub w4, w4, #4 // h -= 4 umull2 v19.8h, v21.16b, v21.16b // Multiply upper half, fourth iteration uadalp v17.4s, v20.8h // Pairwise add and accumulate, fourth iteration cmp w4, #4 uadalp v17.4s, v19.8h // Pairwise add and accumulate, fourth iteration b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v0.16b}, [x1], x3 // Load pix1 ld1 {v1.16b}, [x2], x3 // Load pix2 uabd v30.16b, v0.16b, v1.16b umull v29.8h, v30.8b, v30.8b umull2 v28.8h, v30.16b, v30.16b uadalp v17.4s, v29.8h subs w4, w4, #1 uadalp v17.4s, v28.8h b.ne 2b 3: uaddlv d16, v17.4s // add up accumulator vector fmov w0, s16 ret endfunc function sse8_neon, export=1 // x0 - unused // x1 - pix1 // x2 - pix2 // x3 - stride // w4 - h movi v21.4s, #0 movi v20.4s, #0 cmp w4, #4 b.lt 2f // make 4 iterations at once 1: // res = abs(pix1[0] - pix2[0]) // res * res ld1 {v0.8b}, [x1], x3 // Load pix1 for first iteration ld1 {v1.8b}, [x2], x3 // Load pix2 for second iteration ld1 {v2.8b}, [x1], x3 // Load pix1 for second iteration ld1 {v3.8b}, [x2], x3 // Load pix2 for second iteration uabdl v30.8h, v0.8b, v1.8b // Absolute difference, first iteration ld1 {v4.8b}, [x1], x3 // Load pix1 for third iteration ld1 {v5.8b}, [x2], x3 // Load pix2 for third iteration uabdl v29.8h, v2.8b, v3.8b // Absolute difference, second iteration umlal v21.4s, v30.4h, v30.4h // Multiply lower half, first iteration ld1 {v6.8b}, [x1], x3 // Load pix1 for fourth iteration ld1 {v7.8b}, [x2], x3 // Load pix2 for fourth iteration uabdl v28.8h, v4.8b, v5.8b // Absolute difference, third iteration umlal v21.4s, v29.4h, v29.4h // Multiply lower half, second iteration umlal2 v20.4s, v30.8h, v30.8h // Multiply upper half, first iteration uabdl v27.8h, v6.8b, v7.8b // Absolute difference, fourth iteration umlal v21.4s, v28.4h, v28.4h // Multiply lower half, third iteration umlal2 v20.4s, v29.8h, v29.8h // Multiply upper half, second iteration sub w4, w4, #4 // h -= 4 umlal2 v20.4s, v28.8h, v28.8h // Multiply upper half, third iteration umlal v21.4s, v27.4h, v27.4h // Multiply lower half, fourth iteration cmp w4, #4 umlal2 v20.4s, v27.8h, v27.8h // Multiply upper half, fourth iteration b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v0.8b}, [x1], x3 // Load pix1 ld1 {v1.8b}, [x2], x3 // Load pix2 subs w4, w4, #1 uabdl v30.8h, v0.8b, v1.8b umlal v21.4s, v30.4h, v30.4h umlal2 v20.4s, v30.8h, v30.8h b.ne 2b 3: add v21.4s, v21.4s, v20.4s // Add accumulator vectors together uaddlv d17, v21.4s // Add up vector fmov w0, s17 ret endfunc function sse4_neon, export=1 // x0 - unused // x1 - pix1 // x2 - pix2 // x3 - stride // w4 - h movi v16.4s, #0 // clear the result accumulator cmp w4, #4 b.lt 2f // make 4 iterations at once 1: // res = abs(pix1[0] - pix2[0]) // res * res ld1 {v0.s}[0], [x1], x3 // Load pix1, first iteration ld1 {v1.s}[0], [x2], x3 // Load pix2, first iteration ld1 {v2.s}[0], [x1], x3 // Load pix1, second iteration ld1 {v3.s}[0], [x2], x3 // Load pix2, second iteration uabdl v30.8h, v0.8b, v1.8b // Absolute difference, first iteration ld1 {v4.s}[0], [x1], x3 // Load pix1, third iteration ld1 {v5.s}[0], [x2], x3 // Load pix2, third iteration uabdl v29.8h, v2.8b, v3.8b // Absolute difference, second iteration umlal v16.4s, v30.4h, v30.4h // Multiply vectors, first iteration ld1 {v6.s}[0], [x1], x3 // Load pix1, fourth iteration ld1 {v7.s}[0], [x2], x3 // Load pix2, fourth iteration uabdl v28.8h, v4.8b, v5.8b // Absolute difference, third iteration umlal v16.4s, v29.4h, v29.4h // Multiply and accumulate, second iteration sub w4, w4, #4 uabdl v27.8h, v6.8b, v7.8b // Absolue difference, fourth iteration umlal v16.4s, v28.4h, v28.4h // Multiply and accumulate, third iteration cmp w4, #4 umlal v16.4s, v27.4h, v27.4h // Multiply and accumulate, fourth iteration b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v0.s}[0], [x1], x3 // Load pix1 ld1 {v1.s}[0], [x2], x3 // Load pix2 uabdl v30.8h, v0.8b, v1.8b subs w4, w4, #1 umlal v16.4s, v30.4h, v30.4h b.ne 2b 3: uaddlv d17, v16.4s // Add vector fmov w0, s17 ret endfunc function vsad16_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h ld1 {v0.16b}, [x1], x3 // Load pix1[0], first iteration ld1 {v1.16b}, [x2], x3 // Load pix2[0], first iteration sub w4, w4, #1 // we need to make h-1 iterations movi v16.8h, #0 cmp w4, #3 // check if we can make 3 iterations at once usubl v31.8h, v0.8b, v1.8b // Signed difference pix1[0] - pix2[0], first iteration usubl2 v30.8h, v0.16b, v1.16b // Signed difference pix1[0] - pix2[0], first iteration b.lt 2f 1: // abs(pix1[0] - pix2[0] - pix1[0 + stride] + pix2[0 + stride]) ld1 {v0.16b}, [x1], x3 // Load pix1[0 + stride], first iteration ld1 {v1.16b}, [x2], x3 // Load pix2[0 + stride], first iteration ld1 {v2.16b}, [x1], x3 // Load pix1[0 + stride], second iteration ld1 {v3.16b}, [x2], x3 // Load pix2[0 + stride], second iteration usubl v29.8h, v0.8b, v1.8b // Signed difference pix1[0 + stride] - pix2[0 + stride], first iteration usubl2 v28.8h, v0.16b, v1.16b // Signed difference pix1[0 + stride] - pix2[0 + stride], first iteration ld1 {v4.16b}, [x1], x3 // Load pix1[0 + stride], third iteration ld1 {v5.16b}, [x2], x3 // Load pix2[0 + stride], third iteration usubl v27.8h, v2.8b, v3.8b // Signed difference pix1[0 + stride] - pix2[0 + stride], second iteration saba v16.8h, v31.8h, v29.8h // Signed absolute difference and accumulate the result. first iteration usubl2 v26.8h, v2.16b, v3.16b // Signed difference pix1[0 + stride] - pix2[0 + stride], second iteration saba v16.8h, v30.8h, v28.8h // Signed absolute difference and accumulate the result. first iteration usubl v25.8h, v4.8b, v5.8b // Signed difference pix1[0 + stride] - pix2[0 + stride], third iteration usubl2 v24.8h, v4.16b, v5.16b // Signed difference pix1[0 + stride] - pix2[0 + stride], third iteration saba v16.8h, v29.8h, v27.8h // Signed absolute difference and accumulate the result. second iteration mov v31.16b, v25.16b saba v16.8h, v28.8h, v26.8h // Signed absolute difference and accumulate the result. second iteration sub w4, w4, #3 // h -= 3 mov v30.16b, v24.16b saba v16.8h, v27.8h, v25.8h // Signed absolute difference and accumulate the result. third iteration cmp w4, #3 saba v16.8h, v26.8h, v24.8h // Signed absolute difference and accumulate the result. third iteration b.ge 1b cbz w4, 3f 2: ld1 {v0.16b}, [x1], x3 ld1 {v1.16b}, [x2], x3 subs w4, w4, #1 usubl v29.8h, v0.8b, v1.8b usubl2 v28.8h, v0.16b, v1.16b saba v16.8h, v31.8h, v29.8h mov v31.16b, v29.16b saba v16.8h, v30.8h, v28.8h mov v30.16b, v28.16b b.ne 2b 3: uaddlv s17, v16.8h fmov w0, s17 ret endfunc function vsse16_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h ld1 {v0.16b}, [x1], x3 // Load pix1[0], first iteration ld1 {v1.16b}, [x2], x3 // Load pix2[0], first iteration sub w4, w4, #1 // we need to make h-1 iterations movi v16.4s, #0 movi v17.4s, #0 cmp w4, #3 // check if we can make 3 iterations at once usubl v31.8h, v0.8b, v1.8b // Signed difference of pix1[0] - pix2[0], first iteration usubl2 v30.8h, v0.16b, v1.16b // Signed difference of pix1[0] - pix2[0], first iteration b.lt 2f 1: // x = abs(pix1[0] - pix2[0] - pix1[0 + stride] + pix2[0 + stride]) // res = (x) * (x) ld1 {v0.16b}, [x1], x3 // Load pix1[0 + stride], first iteration ld1 {v1.16b}, [x2], x3 // Load pix2[0 + stride], first iteration ld1 {v2.16b}, [x1], x3 // Load pix1[0 + stride], second iteration ld1 {v3.16b}, [x2], x3 // Load pix2[0 + stride], second iteration usubl v29.8h, v0.8b, v1.8b usubl2 v28.8h, v0.16b, v1.16b ld1 {v4.16b}, [x1], x3 // Load pix1[0 + stride], third iteration ld1 {v5.16b}, [x2], x3 // Load pix1[0 + stride], third iteration sabd v31.8h, v31.8h, v29.8h sabd v30.8h, v30.8h, v28.8h usubl v27.8h, v2.8b, v3.8b usubl2 v26.8h, v2.16b, v3.16b usubl v25.8h, v4.8b, v5.8b usubl2 v24.8h, v4.16b, v5.16b sabd v29.8h, v29.8h, v27.8h sabd v27.8h, v27.8h, v25.8h umlal v16.4s, v31.4h, v31.4h umlal2 v17.4s, v31.8h, v31.8h sabd v28.8h, v28.8h, v26.8h sabd v26.8h, v26.8h, v24.8h umlal v16.4s, v30.4h, v30.4h umlal2 v17.4s, v30.8h, v30.8h mov v31.16b, v25.16b umlal v16.4s, v29.4h, v29.4h umlal2 v17.4s, v29.8h, v29.8h mov v30.16b, v24.16b umlal v16.4s, v28.4h, v28.4h umlal2 v17.4s, v28.8h, v28.8h sub w4, w4, #3 umlal v16.4s, v27.4h, v27.4h umlal2 v17.4s, v27.8h, v27.8h cmp w4, #3 umlal v16.4s, v26.4h, v26.4h umlal2 v17.4s, v26.8h, v26.8h b.ge 1b cbz w4, 3f // iterate by once 2: ld1 {v0.16b}, [x1], x3 ld1 {v1.16b}, [x2], x3 subs w4, w4, #1 usubl v29.8h, v0.8b, v1.8b usubl2 v28.8h, v0.16b, v1.16b sabd v31.8h, v31.8h, v29.8h sabd v30.8h, v30.8h, v28.8h umlal v16.4s, v31.4h, v31.4h umlal2 v17.4s, v31.8h, v31.8h mov v31.16b, v29.16b umlal v16.4s, v30.4h, v30.4h umlal2 v17.4s, v30.8h, v30.8h mov v30.16b, v28.16b b.ne 2b 3: add v16.4s, v16.4s, v17.4s uaddlv d17, v16.4s fmov w0, s17 ret endfunc function vsad_intra16_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *dummy // x3 ptrdiff_t stride // w4 int h ld1 {v0.16b}, [x1], x3 sub w4, w4, #1 // we need to make h-1 iterations cmp w4, #3 movi v16.8h, #0 b.lt 2f // make 4 iterations at once 1: // v = abs( pix1[0] - pix1[0 + stride] ) // score = sum(v) ld1 {v1.16b}, [x1], x3 ld1 {v2.16b}, [x1], x3 uabal v16.8h, v0.8b, v1.8b ld1 {v3.16b}, [x1], x3 uabal2 v16.8h, v0.16b, v1.16b sub w4, w4, #3 uabal v16.8h, v1.8b, v2.8b cmp w4, #3 uabal2 v16.8h, v1.16b, v2.16b mov v0.16b, v3.16b uabal v16.8h, v2.8b, v3.8b uabal2 v16.8h, v2.16b, v3.16b b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v1.16b}, [x1], x3 subs w4, w4, #1 uabal v16.8h, v0.8b, v1.8b uabal2 v16.8h, v0.16b, v1.16b mov v0.16b, v1.16b cbnz w4, 2b 3: uaddlv s17, v16.8h fmov w0, s17 ret endfunc function vsse_intra16_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *dummy // x3 ptrdiff_t stride // w4 int h ld1 {v0.16b}, [x1], x3 movi v16.4s, #0 movi v17.4s, #0 sub w4, w4, #1 // we need to make h-1 iterations cmp w4, #3 b.lt 2f 1: // v = abs( pix1[0] - pix1[0 + stride] ) // score = sum( v * v ) ld1 {v1.16b}, [x1], x3 ld1 {v2.16b}, [x1], x3 uabd v30.16b, v0.16b, v1.16b ld1 {v3.16b}, [x1], x3 umull v29.8h, v30.8b, v30.8b umull2 v28.8h, v30.16b, v30.16b uabd v27.16b, v1.16b, v2.16b uadalp v16.4s, v29.8h umull v26.8h, v27.8b, v27.8b umull2 v27.8h, v27.16b, v27.16b uadalp v17.4s, v28.8h uabd v25.16b, v2.16b, v3.16b uadalp v16.4s, v26.8h umull v24.8h, v25.8b, v25.8b umull2 v25.8h, v25.16b, v25.16b uadalp v17.4s, v27.8h sub w4, w4, #3 uadalp v16.4s, v24.8h cmp w4, #3 uadalp v17.4s, v25.8h mov v0.16b, v3.16b b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v1.16b}, [x1], x3 subs w4, w4, #1 uabd v30.16b, v0.16b, v1.16b mov v0.16b, v1.16b umull v29.8h, v30.8b, v30.8b umull2 v30.8h, v30.16b, v30.16b uadalp v16.4s, v29.8h uadalp v17.4s, v30.8h cbnz w4, 2b 3: add v16.4s, v16.4s, v17.4S uaddlv d17, v16.4s fmov w0, s17 ret endfunc function nsse16_neon, export=1 // x0 multiplier // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h str x0, [sp, #-0x40]! stp x1, x2, [sp, #0x10] stp x3, x4, [sp, #0x20] str x30, [sp, #0x30] bl X(sse16_neon) ldr x30, [sp, #0x30] mov w9, w0 // here we store score1 ldr x5, [sp] ldp x1, x2, [sp, #0x10] ldp x3, x4, [sp, #0x20] add sp, sp, #0x40 movi v16.8h, #0 movi v17.8h, #0 movi v18.8h, #0 movi v19.8h, #0 ld1 {v0.16b}, [x1], x3 subs w4, w4, #1 // we need to make h-1 iterations ld1 {v2.16b}, [x2], x3 ext v1.16b, v0.16b, v0.16b, #1 // x1 + 1 cmp w4, #2 ext v3.16b, v2.16b, v2.16b, #1 // x2 + 1 b.lt 2f // make 2 iterations at once 1: ld1 {v4.16b}, [x1], x3 ld1 {v6.16b}, [x2], x3 ld1 {v20.16b}, [x1], x3 ext v5.16b, v4.16b, v4.16b, #1 // x1 + stride + 1 usubl v31.8h, v0.8b, v4.8b usubl2 v30.8h, v0.16b, v4.16b ld1 {v22.16b}, [x2], x3 usubl v29.8h, v1.8b, v5.8b usubl2 v28.8h, v1.16b, v5.16b ext v7.16b, v6.16b, v6.16b, #1 // x2 + stride + 1 saba v16.8h, v31.8h, v29.8h ext v21.16b, v20.16b, v20.16b, #1 saba v17.8h, v30.8h, v28.8h usubl v27.8h, v2.8b, v6.8b usubl2 v26.8h, v2.16b, v6.16b ext v23.16b, v22.16b, v22.16b, #1 usubl v25.8h, v3.8b, v7.8b usubl2 v24.8h, v3.16b, v7.16b saba v18.8h, v27.8h, v25.8h saba v19.8h, v26.8h, v24.8h usubl v31.8h, v4.8b, v20.8b usubl2 v30.8h, v4.16b, v20.16b usubl v29.8h, v5.8b, v21.8b usubl2 v28.8h, v5.16b, v21.16b saba v16.8h, v31.8h, v29.8h saba v17.8h, v30.8h, v28.8h usubl v27.8h, v6.8b, v22.8b usubl2 v26.8h, v6.16b, v22.16b usubl v25.8h, v7.8b, v23.8b usubl2 v24.8h, v7.16b, v23.16b saba v18.8h, v27.8h, v25.8h saba v19.8h, v26.8h, v24.8h sub w4, w4, #2 mov v0.16b, v20.16b mov v1.16b, v21.16b cmp w4, #2 mov v2.16b, v22.16b mov v3.16b, v23.16b b.ge 1b cbz w4, 3f // iterate by one 2: ld1 {v4.16b}, [x1], x3 subs w4, w4, #1 ld1 {v6.16b}, [x2], x3 ext v5.16b, v4.16b, v4.16b, #1 // x1 + stride + 1 usubl v31.8h, v0.8b, v4.8b ext v7.16b, v6.16b, v6.16b, #1 // x2 + stride + 1 usubl2 v30.8h, v0.16b, v4.16b usubl v29.8h, v1.8b, v5.8b usubl2 v28.8h, v1.16b, v5.16b saba v16.8h, v31.8h, v29.8h saba v17.8h, v30.8h, v28.8h usubl v27.8h, v2.8b, v6.8b usubl2 v26.8h, v2.16b, v6.16b usubl v25.8h, v3.8b, v7.8b usubl2 v24.8h, v3.16b, v7.16b saba v18.8h, v27.8h, v25.8h saba v19.8h, v26.8h, v24.8h mov v0.16b, v4.16b mov v1.16b, v5.16b mov v2.16b, v6.16b mov v3.16b, v7.16b cbnz w4, 2b 3: sqsub v17.8h, v17.8h, v19.8h sqsub v16.8h, v16.8h, v18.8h ins v17.h[7], wzr sqadd v16.8h, v16.8h, v17.8h saddlv s16, v16.8h sqabs s16, s16 fmov w0, s16 mul w0, w0, w5 add w0, w0, w9 ret endfunc function pix_median_abs16_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h ld1 {v2.16b}, [x1], x3 ld1 {v3.16b}, [x2], x3 movi v31.8h, #0 movi v16.8h, #0 ext v0.16b, v2.16b, v2.16b, #1 ext v1.16b, v3.16b, v3.16b, #1 usubl v28.8h, v2.8b, v3.8b usubl2 v27.8h, v2.16b, v3.16b usubl v26.8h, v0.8b, v1.8b usubl2 v25.8h, v0.16b, v1.16b sub w4, w4, #1 // we need to make h-1 iterations saba v31.8h, v26.8h, v28.8h saba v16.8h, v25.8h, v27.8h mov h18, v28.h[0] cmp w4, #1 sqabs h18, h18 movi v0.8h, #0 b.lt 2f 1: ld1 {v6.16b}, [x1], x3 // pix1 vector for V(j-1) ld1 {v7.16b}, [x2], x3 // pix2 vector for V(j-1) subs w4, w4, #1 ext v4.16b, v6.16b, v6.16b, #1 // pix1 vector for V(j) ext v5.16b, v7.16b, v7.16b, #1 // pix2 vector for V(j) // protected registers: v30, v29, v28, v27, v26, v25, v24, v23 // scratch registers: v22, v21, v20, v19, v17 // To find median of three values, calculate sum of them // and subtract max and min value from it. usubl v30.8h, v6.8b, v7.8b // V(j-1) usubl2 v29.8h, v6.16b, v7.16b // V(j-1) usubl v24.8h, v4.8b, v5.8b // V(j) usubl2 v23.8h, v4.16b, v5.16b // V(j) saba v0.8h, v30.8h, v28.8h add v22.8h, v26.8h, v30.8h smin v20.8h, v26.8h, v30.8h add v21.8h, v25.8h, v29.8h smax v19.8h, v26.8h, v30.8h sub v22.8h, v22.8h, v28.8h sub v21.8h, v21.8h, v27.8h smin v17.8h, v19.8h, v22.8h smin v22.8h, v25.8h, v29.8h mov v28.16b, v30.16b smax v20.8h, v20.8h, v17.8h // median values lower half smax v19.8h, v25.8h, v29.8h saba v31.8h, v24.8h, v20.8h mov v27.16b, v29.16b smin v19.8h, v19.8h, v21.8h mov v26.16b, v24.16b smax v17.8h, v22.8h, v19.8h // median values upper half mov v25.16b, v23.16b saba v16.8h, v23.8h, v17.8h b.ne 1b 2: mov h17, v0.h[0] ins v16.h[7], wzr add d18, d18, d17 add v31.8h, v31.8h, v16.8h uaddlv s17, v31.8h add d18, d18, d17 fmov w0, s18 ret endfunc function vsad_intra8_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *dummy // x3 ptrdiff_t stride // w4 int h ld1 {v0.8b}, [x1], x3 sub w4, w4, #1 // we need to make h-1 iterations cmp w4, #3 movi v16.8h, #0 b.lt 2f 1: // v = abs( pix1[0] - pix1[0 + stride] ) // score = sum(v) ld1 {v1.8b}, [x1], x3 sub w4, w4, #3 ld1 {v2.8b}, [x1], x3 uabal v16.8h, v0.8b, v1.8b ld1 {v3.8b}, [x1], x3 uabal v16.8h, v1.8b, v2.8b cmp w4, #3 mov v0.8b, v3.8b uabal v16.8h, v2.8b, v3.8b b.ge 1b cbz w4, 3f 2: ld1 {v1.8b}, [x1], x3 subs w4, w4, #1 uabal v16.8h, v0.8b, v1.8b mov v0.8b, v1.8b cbnz w4, 2b 3: uaddlv s17, v16.8h fmov w0, s17 ret endfunc function pix_median_abs8_neon, export=1 // x0 unused // x1 uint8_t *pix1 // x2 uint8_t *pix2 // x3 ptrdiff_t stride // w4 int h ld1 {v2.8b}, [x1], x3 ld1 {v3.8b}, [x2], x3 movi v31.8h, #0 ext v0.8b, v2.8b, v2.8b, #1 ext v1.8b, v3.8b, v3.8b, #1 usubl v28.8h, v2.8b, v3.8b usubl v26.8h, v0.8b, v1.8b sub w4, w4, #1 // we need to make h-1 iterations saba v31.8h, v26.8h, v28.8h mov h18, v28.h[0] cmp w4, #1 sqabs h18, h18 movi v0.8h, #0 b.lt 2f 1: ld1 {v6.8b}, [x1], x3 // pix1 vector for V(j-1) ld1 {v7.8b}, [x2], x3 // pix2 vector for V(j-1) subs w4, w4, #1 ext v4.8b, v6.8b, v6.8b, #1 // pix1 vector for V(j) ext v5.8b, v7.8b, v7.8b, #1 // pix2 vector for V(j) // protected registers: v30, v29, v28, v27, v26, v25, v24, v23 // scratch registers: v22, v21, v20, v19, v17 // To find median of three values, calculate sum of them // and subtract max and min value from it. usubl v30.8h, v6.8b, v7.8b // V(j-1) usubl v24.8h, v4.8b, v5.8b // V(j) saba v0.8h, v30.8h, v28.8h add v22.8h, v26.8h, v30.8h smin v20.8h, v26.8h, v30.8h smax v19.8h, v26.8h, v30.8h sub v22.8h, v22.8h, v28.8h smin v17.8h, v19.8h, v22.8h mov v28.16b, v30.16b smax v20.8h, v20.8h, v17.8h // median values lower half smax v19.8h, v25.8h, v29.8h saba v31.8h, v24.8h, v20.8h mov v26.16b, v24.16b smax v17.8h, v22.8h, v19.8h // median values upper half b.ne 1b 2: mov h17, v0.h[0] ins v31.h[7], wzr add d18, d18, d17 uaddlv s17, v31.8h add d18, d18, d17 fmov w0, s18 ret endfunc