src/third_party/libwebp/src/dsp/yuv_neon.c - cobalt - Git at Google

 // Copyright 2017 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.
 // -----------------------------------------------------------------------------
 //
 // YUV->RGB conversion functions
 //
 // Author: Skal (pascal.massimino@gmail.com)

 #include "src/dsp/yuv.h"

 #if defined(WEBP_USE_NEON)

 #include <assert.h>
 #include <stdlib.h>

 #include "src/dsp/neon.h"

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

 static uint8x8_t ConvertRGBToY_NEON(const uint8x8_t R,
                                     const uint8x8_t G,
                                     const uint8x8_t B) {
   const uint16x8_t r = vmovl_u8(R);
   const uint16x8_t g = vmovl_u8(G);
   const uint16x8_t b = vmovl_u8(B);
   const uint16x4_t r_lo = vget_low_u16(r);
   const uint16x4_t r_hi = vget_high_u16(r);
   const uint16x4_t g_lo = vget_low_u16(g);
   const uint16x4_t g_hi = vget_high_u16(g);
   const uint16x4_t b_lo = vget_low_u16(b);
   const uint16x4_t b_hi = vget_high_u16(b);
   const uint32x4_t tmp0_lo = vmull_n_u16(         r_lo, 16839u);
   const uint32x4_t tmp0_hi = vmull_n_u16(         r_hi, 16839u);
   const uint32x4_t tmp1_lo = vmlal_n_u16(tmp0_lo, g_lo, 33059u);
   const uint32x4_t tmp1_hi = vmlal_n_u16(tmp0_hi, g_hi, 33059u);
   const uint32x4_t tmp2_lo = vmlal_n_u16(tmp1_lo, b_lo, 6420u);
   const uint32x4_t tmp2_hi = vmlal_n_u16(tmp1_hi, b_hi, 6420u);
   const uint16x8_t Y1 = vcombine_u16(vrshrn_n_u32(tmp2_lo, 16),
                                      vrshrn_n_u32(tmp2_hi, 16));
   const uint16x8_t Y2 = vaddq_u16(Y1, vdupq_n_u16(16));
   return vqmovn_u16(Y2);
 }

 static void ConvertRGB24ToY_NEON(const uint8_t* rgb, uint8_t* y, int width) {
   int i;
   for (i = 0; i + 8 <= width; i += 8, rgb += 3 * 8) {
     const uint8x8x3_t RGB = vld3_u8(rgb);
     const uint8x8_t Y = ConvertRGBToY_NEON(RGB.val[0], RGB.val[1], RGB.val[2]);
     vst1_u8(y + i, Y);
   }
   for (; i < width; ++i, rgb += 3) {   // left-over
     y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF);
   }
 }

 static void ConvertBGR24ToY_NEON(const uint8_t* bgr, uint8_t* y, int width) {
   int i;
   for (i = 0; i + 8 <= width; i += 8, bgr += 3 * 8) {
     const uint8x8x3_t BGR = vld3_u8(bgr);
     const uint8x8_t Y = ConvertRGBToY_NEON(BGR.val[2], BGR.val[1], BGR.val[0]);
     vst1_u8(y + i, Y);
   }
   for (; i < width; ++i, bgr += 3) {  // left-over
     y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF);
   }
 }

 static void ConvertARGBToY_NEON(const uint32_t* argb, uint8_t* y, int width) {
   int i;
   for (i = 0; i + 8 <= width; i += 8) {
     const uint8x8x4_t RGB = vld4_u8((const uint8_t*)&argb[i]);
     const uint8x8_t Y = ConvertRGBToY_NEON(RGB.val[2], RGB.val[1], RGB.val[0]);
     vst1_u8(y + i, Y);
   }
   for (; i < width; ++i) {   // left-over
     const uint32_t p = argb[i];
     y[i] = VP8RGBToY((p >> 16) & 0xff, (p >> 8) & 0xff, (p >>  0) & 0xff,
                      YUV_HALF);
   }
 }

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

 // computes: DST_s16 = [(C0 * r + C1 * g + C2 * b) >> 16] + CST
 #define MULTIPLY_16b_PREAMBLE(r, g, b)                           \
   const int16x4_t r_lo = vreinterpret_s16_u16(vget_low_u16(r));  \
   const int16x4_t r_hi = vreinterpret_s16_u16(vget_high_u16(r)); \
   const int16x4_t g_lo = vreinterpret_s16_u16(vget_low_u16(g));  \
   const int16x4_t g_hi = vreinterpret_s16_u16(vget_high_u16(g)); \
   const int16x4_t b_lo = vreinterpret_s16_u16(vget_low_u16(b));  \
   const int16x4_t b_hi = vreinterpret_s16_u16(vget_high_u16(b))

 #define MULTIPLY_16b(C0, C1, C2, CST, DST_s16) do {              \
   const int32x4_t tmp0_lo = vmull_n_s16(         r_lo, C0);      \
   const int32x4_t tmp0_hi = vmull_n_s16(         r_hi, C0);      \
   const int32x4_t tmp1_lo = vmlal_n_s16(tmp0_lo, g_lo, C1);      \
   const int32x4_t tmp1_hi = vmlal_n_s16(tmp0_hi, g_hi, C1);      \
   const int32x4_t tmp2_lo = vmlal_n_s16(tmp1_lo, b_lo, C2);      \
   const int32x4_t tmp2_hi = vmlal_n_s16(tmp1_hi, b_hi, C2);      \
   const int16x8_t tmp3 = vcombine_s16(vshrn_n_s32(tmp2_lo, 16),  \
                                       vshrn_n_s32(tmp2_hi, 16)); \
   DST_s16 = vaddq_s16(tmp3, vdupq_n_s16(CST));                   \
 } while (0)

 // This needs to be a macro, since (128 << SHIFT) needs to be an immediate.
 #define CONVERT_RGB_TO_UV(r, g, b, SHIFT, U_DST, V_DST) do {     \
   MULTIPLY_16b_PREAMBLE(r, g, b);                                \
   MULTIPLY_16b(-9719, -19081, 28800, 128 << SHIFT, U_DST);       \
   MULTIPLY_16b(28800, -24116, -4684, 128 << SHIFT, V_DST);       \
 } while (0)

 static void ConvertRGBA32ToUV_NEON(const uint16_t* rgb,
                                    uint8_t* u, uint8_t* v, int width) {
   int i;
   for (i = 0; i + 8 <= width; i += 8, rgb += 4 * 8) {
     const uint16x8x4_t RGB = vld4q_u16((const uint16_t*)rgb);
     int16x8_t U, V;
     CONVERT_RGB_TO_UV(RGB.val[0], RGB.val[1], RGB.val[2], 2, U, V);
     vst1_u8(u + i, vqrshrun_n_s16(U, 2));
     vst1_u8(v + i, vqrshrun_n_s16(V, 2));
   }
   for (; i < width; i += 1, rgb += 4) {
     const int r = rgb[0], g = rgb[1], b = rgb[2];
     u[i] = VP8RGBToU(r, g, b, YUV_HALF << 2);
     v[i] = VP8RGBToV(r, g, b, YUV_HALF << 2);
   }
 }

 static void ConvertARGBToUV_NEON(const uint32_t* argb, uint8_t* u, uint8_t* v,
                                  int src_width, int do_store) {
   int i;
   for (i = 0; i + 16 <= src_width; i += 16, u += 8, v += 8) {
     const uint8x16x4_t RGB = vld4q_u8((const uint8_t*)&argb[i]);
     const uint16x8_t R = vpaddlq_u8(RGB.val[2]);  // pair-wise adds
     const uint16x8_t G = vpaddlq_u8(RGB.val[1]);
     const uint16x8_t B = vpaddlq_u8(RGB.val[0]);
     int16x8_t U_tmp, V_tmp;
     CONVERT_RGB_TO_UV(R, G, B, 1, U_tmp, V_tmp);
     {
       const uint8x8_t U = vqrshrun_n_s16(U_tmp, 1);
       const uint8x8_t V = vqrshrun_n_s16(V_tmp, 1);
       if (do_store) {
         vst1_u8(u, U);
         vst1_u8(v, V);
       } else {
         const uint8x8_t prev_u = vld1_u8(u);
         const uint8x8_t prev_v = vld1_u8(v);
         vst1_u8(u, vrhadd_u8(U, prev_u));
         vst1_u8(v, vrhadd_u8(V, prev_v));
       }
     }
   }
   if (i < src_width) {  // left-over
     WebPConvertARGBToUV_C(argb + i, u, v, src_width - i, do_store);
   }
 }


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

 extern void WebPInitConvertARGBToYUVNEON(void);

 WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUVNEON(void) {
   WebPConvertRGB24ToY = ConvertRGB24ToY_NEON;
   WebPConvertBGR24ToY = ConvertBGR24ToY_NEON;
   WebPConvertARGBToY = ConvertARGBToY_NEON;
   WebPConvertARGBToUV = ConvertARGBToUV_NEON;
   WebPConvertRGBA32ToUV = ConvertRGBA32ToUV_NEON;
 }

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

 #define MAX_Y ((1 << 10) - 1)    // 10b precision over 16b-arithmetic
 static uint16_t clip_y_NEON(int v) {
   return (v < 0) ? 0 : (v > MAX_Y) ? MAX_Y : (uint16_t)v;
 }

 static uint64_t SharpYUVUpdateY_NEON(const uint16_t* ref, const uint16_t* src,
                                      uint16_t* dst, int len) {
   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_y_NEON(new_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 SharpYUVFilterRow_NEON(const int16_t* A, const int16_t* B, int len,
                                    const uint16_t* best_y, uint16_t* out) {
   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 d0 = vaddq_s16(c1, a0);
     const int16x8_t d1 = vaddq_s16(c0, a1);
     const int16x8_t e0 = vrshrq_n_s16(d0, 1);
     const int16x8_t e1 = vrshrq_n_s16(d1, 1);
     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_y_NEON(best_y[2 * i + 0] + v0);
     out[2 * i + 1] = clip_y_NEON(best_y[2 * i + 1] + v1);
   }
 }
 #undef MAX_Y

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

 extern void WebPInitSharpYUVNEON(void);

 WEBP_TSAN_IGNORE_FUNCTION void WebPInitSharpYUVNEON(void) {
   WebPSharpYUVUpdateY = SharpYUVUpdateY_NEON;
   WebPSharpYUVUpdateRGB = SharpYUVUpdateRGB_NEON;
   WebPSharpYUVFilterRow = SharpYUVFilterRow_NEON;
 }

 #else  // !WEBP_USE_NEON

 WEBP_DSP_INIT_STUB(WebPInitConvertARGBToYUVNEON)
 WEBP_DSP_INIT_STUB(WebPInitSharpYUVNEON)

 #endif  // WEBP_USE_NEON
	// Copyright 2017 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.
	// -----------------------------------------------------------------------------
	//
	// YUV->RGB conversion functions
	//
	// Author: Skal (pascal.massimino@gmail.com)

	#include "src/dsp/yuv.h"

	#if defined(WEBP_USE_NEON)

	#include <assert.h>
	#include <stdlib.h>

	#include "src/dsp/neon.h"

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

	static uint8x8_t ConvertRGBToY_NEON(const uint8x8_t R,
	const uint8x8_t G,
	const uint8x8_t B) {
	const uint16x8_t r = vmovl_u8(R);
	const uint16x8_t g = vmovl_u8(G);
	const uint16x8_t b = vmovl_u8(B);
	const uint16x4_t r_lo = vget_low_u16(r);
	const uint16x4_t r_hi = vget_high_u16(r);
	const uint16x4_t g_lo = vget_low_u16(g);
	const uint16x4_t g_hi = vget_high_u16(g);
	const uint16x4_t b_lo = vget_low_u16(b);
	const uint16x4_t b_hi = vget_high_u16(b);
	const uint32x4_t tmp0_lo = vmull_n_u16( r_lo, 16839u);
	const uint32x4_t tmp0_hi = vmull_n_u16( r_hi, 16839u);
	const uint32x4_t tmp1_lo = vmlal_n_u16(tmp0_lo, g_lo, 33059u);
	const uint32x4_t tmp1_hi = vmlal_n_u16(tmp0_hi, g_hi, 33059u);
	const uint32x4_t tmp2_lo = vmlal_n_u16(tmp1_lo, b_lo, 6420u);
	const uint32x4_t tmp2_hi = vmlal_n_u16(tmp1_hi, b_hi, 6420u);
	const uint16x8_t Y1 = vcombine_u16(vrshrn_n_u32(tmp2_lo, 16),
	vrshrn_n_u32(tmp2_hi, 16));
	const uint16x8_t Y2 = vaddq_u16(Y1, vdupq_n_u16(16));
	return vqmovn_u16(Y2);
	}

	static void ConvertRGB24ToY_NEON(const uint8_t* rgb, uint8_t* y, int width) {
	int i;
	for (i = 0; i + 8 <= width; i += 8, rgb += 3 * 8) {
	const uint8x8x3_t RGB = vld3_u8(rgb);
	const uint8x8_t Y = ConvertRGBToY_NEON(RGB.val[0], RGB.val[1], RGB.val[2]);
	vst1_u8(y + i, Y);
	}
	for (; i < width; ++i, rgb += 3) { // left-over
	y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF);
	}
	}

	static void ConvertBGR24ToY_NEON(const uint8_t* bgr, uint8_t* y, int width) {
	int i;
	for (i = 0; i + 8 <= width; i += 8, bgr += 3 * 8) {
	const uint8x8x3_t BGR = vld3_u8(bgr);
	const uint8x8_t Y = ConvertRGBToY_NEON(BGR.val[2], BGR.val[1], BGR.val[0]);
	vst1_u8(y + i, Y);
	}
	for (; i < width; ++i, bgr += 3) { // left-over
	y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF);
	}
	}

	static void ConvertARGBToY_NEON(const uint32_t* argb, uint8_t* y, int width) {
	int i;
	for (i = 0; i + 8 <= width; i += 8) {
	const uint8x8x4_t RGB = vld4_u8((const uint8_t*)&argb[i]);
	const uint8x8_t Y = ConvertRGBToY_NEON(RGB.val[2], RGB.val[1], RGB.val[0]);
	vst1_u8(y + i, Y);
	}
	for (; i < width; ++i) { // left-over
	const uint32_t p = argb[i];
	y[i] = VP8RGBToY((p >> 16) & 0xff, (p >> 8) & 0xff, (p >> 0) & 0xff,
	YUV_HALF);
	}
	}

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

	// computes: DST_s16 = [(C0 * r + C1 * g + C2 * b) >> 16] + CST
	#define MULTIPLY_16b_PREAMBLE(r, g, b) \
	const int16x4_t r_lo = vreinterpret_s16_u16(vget_low_u16(r)); \
	const int16x4_t r_hi = vreinterpret_s16_u16(vget_high_u16(r)); \
	const int16x4_t g_lo = vreinterpret_s16_u16(vget_low_u16(g)); \
	const int16x4_t g_hi = vreinterpret_s16_u16(vget_high_u16(g)); \
	const int16x4_t b_lo = vreinterpret_s16_u16(vget_low_u16(b)); \
	const int16x4_t b_hi = vreinterpret_s16_u16(vget_high_u16(b))

	#define MULTIPLY_16b(C0, C1, C2, CST, DST_s16) do { \
	const int32x4_t tmp0_lo = vmull_n_s16( r_lo, C0); \
	const int32x4_t tmp0_hi = vmull_n_s16( r_hi, C0); \
	const int32x4_t tmp1_lo = vmlal_n_s16(tmp0_lo, g_lo, C1); \
	const int32x4_t tmp1_hi = vmlal_n_s16(tmp0_hi, g_hi, C1); \
	const int32x4_t tmp2_lo = vmlal_n_s16(tmp1_lo, b_lo, C2); \
	const int32x4_t tmp2_hi = vmlal_n_s16(tmp1_hi, b_hi, C2); \
	const int16x8_t tmp3 = vcombine_s16(vshrn_n_s32(tmp2_lo, 16), \
	vshrn_n_s32(tmp2_hi, 16)); \
	DST_s16 = vaddq_s16(tmp3, vdupq_n_s16(CST)); \
	} while (0)

	// This needs to be a macro, since (128 << SHIFT) needs to be an immediate.
	#define CONVERT_RGB_TO_UV(r, g, b, SHIFT, U_DST, V_DST) do { \
	MULTIPLY_16b_PREAMBLE(r, g, b); \
	MULTIPLY_16b(-9719, -19081, 28800, 128 << SHIFT, U_DST); \
	MULTIPLY_16b(28800, -24116, -4684, 128 << SHIFT, V_DST); \
	} while (0)

	static void ConvertRGBA32ToUV_NEON(const uint16_t* rgb,
	uint8_t* u, uint8_t* v, int width) {
	int i;
	for (i = 0; i + 8 <= width; i += 8, rgb += 4 * 8) {
	const uint16x8x4_t RGB = vld4q_u16((const uint16_t*)rgb);
	int16x8_t U, V;
	CONVERT_RGB_TO_UV(RGB.val[0], RGB.val[1], RGB.val[2], 2, U, V);
	vst1_u8(u + i, vqrshrun_n_s16(U, 2));
	vst1_u8(v + i, vqrshrun_n_s16(V, 2));
	}
	for (; i < width; i += 1, rgb += 4) {
	const int r = rgb[0], g = rgb[1], b = rgb[2];
	u[i] = VP8RGBToU(r, g, b, YUV_HALF << 2);
	v[i] = VP8RGBToV(r, g, b, YUV_HALF << 2);
	}
	}

	static void ConvertARGBToUV_NEON(const uint32_t* argb, uint8_t* u, uint8_t* v,
	int src_width, int do_store) {
	int i;
	for (i = 0; i + 16 <= src_width; i += 16, u += 8, v += 8) {
	const uint8x16x4_t RGB = vld4q_u8((const uint8_t*)&argb[i]);
	const uint16x8_t R = vpaddlq_u8(RGB.val[2]); // pair-wise adds
	const uint16x8_t G = vpaddlq_u8(RGB.val[1]);
	const uint16x8_t B = vpaddlq_u8(RGB.val[0]);
	int16x8_t U_tmp, V_tmp;
	CONVERT_RGB_TO_UV(R, G, B, 1, U_tmp, V_tmp);
	{
	const uint8x8_t U = vqrshrun_n_s16(U_tmp, 1);
	const uint8x8_t V = vqrshrun_n_s16(V_tmp, 1);
	if (do_store) {
	vst1_u8(u, U);
	vst1_u8(v, V);
	} else {
	const uint8x8_t prev_u = vld1_u8(u);
	const uint8x8_t prev_v = vld1_u8(v);
	vst1_u8(u, vrhadd_u8(U, prev_u));
	vst1_u8(v, vrhadd_u8(V, prev_v));
	}
	}
	}
	if (i < src_width) { // left-over
	WebPConvertARGBToUV_C(argb + i, u, v, src_width - i, do_store);
	}
	}


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

	extern void WebPInitConvertARGBToYUVNEON(void);

	WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUVNEON(void) {
	WebPConvertRGB24ToY = ConvertRGB24ToY_NEON;
	WebPConvertBGR24ToY = ConvertBGR24ToY_NEON;
	WebPConvertARGBToY = ConvertARGBToY_NEON;
	WebPConvertARGBToUV = ConvertARGBToUV_NEON;
	WebPConvertRGBA32ToUV = ConvertRGBA32ToUV_NEON;
	}

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

	#define MAX_Y ((1 << 10) - 1) // 10b precision over 16b-arithmetic
	static uint16_t clip_y_NEON(int v) {
	return (v < 0) ? 0 : (v > MAX_Y) ? MAX_Y : (uint16_t)v;
	}

	static uint64_t SharpYUVUpdateY_NEON(const uint16_t* ref, const uint16_t* src,
	uint16_t* dst, int len) {
	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_y_NEON(new_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 SharpYUVFilterRow_NEON(const int16_t* A, const int16_t* B, int len,
	const uint16_t* best_y, uint16_t* out) {
	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 d0 = vaddq_s16(c1, a0);
	const int16x8_t d1 = vaddq_s16(c0, a1);
	const int16x8_t e0 = vrshrq_n_s16(d0, 1);
	const int16x8_t e1 = vrshrq_n_s16(d1, 1);
	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_y_NEON(best_y[2 * i + 0] + v0);
	out[2 * i + 1] = clip_y_NEON(best_y[2 * i + 1] + v1);
	}
	}
	#undef MAX_Y

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

	extern void WebPInitSharpYUVNEON(void);

	WEBP_TSAN_IGNORE_FUNCTION void WebPInitSharpYUVNEON(void) {
	WebPSharpYUVUpdateY = SharpYUVUpdateY_NEON;
	WebPSharpYUVUpdateRGB = SharpYUVUpdateRGB_NEON;
	WebPSharpYUVFilterRow = SharpYUVFilterRow_NEON;
	}

	#else // !WEBP_USE_NEON

	WEBP_DSP_INIT_STUB(WebPInitConvertARGBToYUVNEON)
	WEBP_DSP_INIT_STUB(WebPInitSharpYUVNEON)

	#endif // WEBP_USE_NEON