sharpyuv_neon.c - mozsearch

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// Copyright 2022 Google Inc. All Rights Reserved.

//

// Use of this source code is governed by a BSD-style license

// that can be found in the COPYING file in the root of the source

// tree. An additional intellectual property rights grant can be found

// in the file PATENTS. All contributing project authors may

// be found in the AUTHORS file in the root of the source tree.

// -----------------------------------------------------------------------------

//

// Speed-critical functions for Sharp YUV.

//

// Author: Skal (pascal.massimino@gmail.com)

#include "sharpyuv/sharpyuv_dsp.h"

#if defined(WEBP_USE_NEON)

#include <assert.h>

#include <stdlib.h>

#include <arm_neon.h>

static uint16_t clip_NEON(int v, int max) {

  return (v < 0) ? 0 : (v > max) ? max : (uint16_t)v;

static uint64_t SharpYuvUpdateY_NEON(const uint16_t* ref, const uint16_t* src,

                                     uint16_t* dst, int len, int bit_depth) {

  const int max_y = (1 << bit_depth) - 1;

  int i;

  const int16x8_t zero = vdupq_n_s16(0);

  const int16x8_t max = vdupq_n_s16(max_y);

  uint64x2_t sum = vdupq_n_u64(0);

  uint64_t diff;

  for (i = 0; i + 8 <= len; i += 8) {

    const int16x8_t A = vreinterpretq_s16_u16(vld1q_u16(ref + i));

    const int16x8_t B = vreinterpretq_s16_u16(vld1q_u16(src + i));

    const int16x8_t C = vreinterpretq_s16_u16(vld1q_u16(dst + i));

    const int16x8_t D = vsubq_s16(A, B);       // diff_y

    const int16x8_t F = vaddq_s16(C, D);       // new_y

    const uint16x8_t H =

        vreinterpretq_u16_s16(vmaxq_s16(vminq_s16(F, max), zero));

    const int16x8_t I = vabsq_s16(D);          // abs(diff_y)

    vst1q_u16(dst + i, H);

    sum = vpadalq_u32(sum, vpaddlq_u16(vreinterpretq_u16_s16(I)));

  diff = vgetq_lane_u64(sum, 0) + vgetq_lane_u64(sum, 1);

  for (; i < len; ++i) {

    const int diff_y = ref[i] - src[i];

    const int new_y = (int)(dst[i]) + diff_y;

    dst[i] = clip_NEON(new_y, max_y);

    diff += (uint64_t)(abs(diff_y));

  return diff;

static void SharpYuvUpdateRGB_NEON(const int16_t* ref, const int16_t* src,

                                   int16_t* dst, int len) {

  int i;

  for (i = 0; i + 8 <= len; i += 8) {

    const int16x8_t A = vld1q_s16(ref + i);

    const int16x8_t B = vld1q_s16(src + i);

    const int16x8_t C = vld1q_s16(dst + i);

    const int16x8_t D = vsubq_s16(A, B);   // diff_uv

    const int16x8_t E = vaddq_s16(C, D);   // new_uv

    vst1q_s16(dst + i, E);

  for (; i < len; ++i) {

    const int diff_uv = ref[i] - src[i];

    dst[i] += diff_uv;

static void SharpYuvFilterRow16_NEON(const int16_t* A, const int16_t* B,

                                     int len, const uint16_t* best_y,

                                     uint16_t* out, int bit_depth) {

  const int max_y = (1 << bit_depth) - 1;

  int i;

  const int16x8_t max = vdupq_n_s16(max_y);

  const int16x8_t zero = vdupq_n_s16(0);

  for (i = 0; i + 8 <= len; i += 8) {

    const int16x8_t a0 = vld1q_s16(A + i + 0);

    const int16x8_t a1 = vld1q_s16(A + i + 1);

    const int16x8_t b0 = vld1q_s16(B + i + 0);

    const int16x8_t b1 = vld1q_s16(B + i + 1);

    const int16x8_t a0b1 = vaddq_s16(a0, b1);

    const int16x8_t a1b0 = vaddq_s16(a1, b0);

    const int16x8_t a0a1b0b1 = vaddq_s16(a0b1, a1b0);  // A0+A1+B0+B1

    const int16x8_t a0b1_2 = vaddq_s16(a0b1, a0b1);    // 2*(A0+B1)

    const int16x8_t a1b0_2 = vaddq_s16(a1b0, a1b0);    // 2*(A1+B0)

    const int16x8_t c0 = vshrq_n_s16(vaddq_s16(a0b1_2, a0a1b0b1), 3);

    const int16x8_t c1 = vshrq_n_s16(vaddq_s16(a1b0_2, a0a1b0b1), 3);

    const int16x8_t e0 = vrhaddq_s16(c1, a0);

    const int16x8_t e1 = vrhaddq_s16(c0, a1);

    const int16x8x2_t f = vzipq_s16(e0, e1);

    const int16x8_t g0 = vreinterpretq_s16_u16(vld1q_u16(best_y + 2 * i + 0));

    const int16x8_t g1 = vreinterpretq_s16_u16(vld1q_u16(best_y + 2 * i + 8));

    const int16x8_t h0 = vaddq_s16(g0, f.val[0]);

    const int16x8_t h1 = vaddq_s16(g1, f.val[1]);

    const int16x8_t i0 = vmaxq_s16(vminq_s16(h0, max), zero);

    const int16x8_t i1 = vmaxq_s16(vminq_s16(h1, max), zero);

    vst1q_u16(out + 2 * i + 0, vreinterpretq_u16_s16(i0));

    vst1q_u16(out + 2 * i + 8, vreinterpretq_u16_s16(i1));

  for (; i < len; ++i) {

    const int a0b1 = A[i + 0] + B[i + 1];

    const int a1b0 = A[i + 1] + B[i + 0];

    const int a0a1b0b1 = a0b1 + a1b0 + 8;

    const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4;

    const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4;

    out[2 * i + 0] = clip_NEON(best_y[2 * i + 0] + v0, max_y);

    out[2 * i + 1] = clip_NEON(best_y[2 * i + 1] + v1, max_y);

static void SharpYuvFilterRow32_NEON(const int16_t* A, const int16_t* B,

                                     int len, const uint16_t* best_y,

                                     uint16_t* out, int bit_depth) {

  const int max_y = (1 << bit_depth) - 1;

  int i;

  const uint16x8_t max = vdupq_n_u16(max_y);

  for (i = 0; i + 4 <= len; i += 4) {

    const int16x4_t a0 = vld1_s16(A + i + 0);

    const int16x4_t a1 = vld1_s16(A + i + 1);

    const int16x4_t b0 = vld1_s16(B + i + 0);

    const int16x4_t b1 = vld1_s16(B + i + 1);

    const int32x4_t a0b1 = vaddl_s16(a0, b1);

    const int32x4_t a1b0 = vaddl_s16(a1, b0);

    const int32x4_t a0a1b0b1 = vaddq_s32(a0b1, a1b0);  // A0+A1+B0+B1

    const int32x4_t a0b1_2 = vaddq_s32(a0b1, a0b1);    // 2*(A0+B1)

    const int32x4_t a1b0_2 = vaddq_s32(a1b0, a1b0);    // 2*(A1+B0)

    const int32x4_t c0 = vshrq_n_s32(vaddq_s32(a0b1_2, a0a1b0b1), 3);

    const int32x4_t c1 = vshrq_n_s32(vaddq_s32(a1b0_2, a0a1b0b1), 3);

    const int32x4_t e0 = vrhaddq_s32(c1, vmovl_s16(a0));

    const int32x4_t e1 = vrhaddq_s32(c0, vmovl_s16(a1));

    const int32x4x2_t f = vzipq_s32(e0, e1);

    const int16x8_t g = vreinterpretq_s16_u16(vld1q_u16(best_y + 2 * i));

    const int32x4_t h0 = vaddw_s16(f.val[0], vget_low_s16(g));

    const int32x4_t h1 = vaddw_s16(f.val[1], vget_high_s16(g));

    const uint16x8_t i_16 = vcombine_u16(vqmovun_s32(h0), vqmovun_s32(h1));

    const uint16x8_t i_clamped = vminq_u16(i_16, max);

    vst1q_u16(out + 2 * i + 0, i_clamped);

  for (; i < len; ++i) {

    const int a0b1 = A[i + 0] + B[i + 1];

    const int a1b0 = A[i + 1] + B[i + 0];

    const int a0a1b0b1 = a0b1 + a1b0 + 8;

    const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4;

    const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4;

    out[2 * i + 0] = clip_NEON(best_y[2 * i + 0] + v0, max_y);

    out[2 * i + 1] = clip_NEON(best_y[2 * i + 1] + v1, max_y);

static void SharpYuvFilterRow_NEON(const int16_t* A, const int16_t* B, int len,

                                   const uint16_t* best_y, uint16_t* out,

                                   int bit_depth) {

  if (bit_depth <= 10) {

    SharpYuvFilterRow16_NEON(A, B, len, best_y, out, bit_depth);

  } else {

    SharpYuvFilterRow32_NEON(A, B, len, best_y, out, bit_depth);

//------------------------------------------------------------------------------

extern void InitSharpYuvNEON(void);

WEBP_TSAN_IGNORE_FUNCTION void InitSharpYuvNEON(void) {

  SharpYuvUpdateY = SharpYuvUpdateY_NEON;

  SharpYuvUpdateRGB = SharpYuvUpdateRGB_NEON;

  SharpYuvFilterRow = SharpYuvFilterRow_NEON;

#else  // !WEBP_USE_NEON

extern void InitSharpYuvNEON(void);

void InitSharpYuvNEON(void) {}

#endif  // WEBP_USE_NEON