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diff --git a/media/libwebp/src/dsp/lossless_sse41.c b/media/libwebp/src/dsp/lossless_sse41.c
new file mode 100644
index 0000000000..bb7ce7611f
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+++ b/media/libwebp/src/dsp/lossless_sse41.c
@@ -0,0 +1,133 @@
+// Copyright 2021 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.
+// -----------------------------------------------------------------------------
+//
+// SSE41 variant of methods for lossless decoder
+
+#include "src/dsp/dsp.h"
+
+#if defined(WEBP_USE_SSE41)
+
+#include "src/dsp/common_sse41.h"
+#include "src/dsp/lossless.h"
+#include "src/dsp/lossless_common.h"
+
+//------------------------------------------------------------------------------
+// Color-space conversion functions
+
+static void TransformColorInverse_SSE41(const VP8LMultipliers* const m,
+                                        const uint32_t* const src,
+                                        int num_pixels, uint32_t* dst) {
+// sign-extended multiplying constants, pre-shifted by 5.
+#define CST(X)  (((int16_t)(m->X << 8)) >> 5)   // sign-extend
+  const __m128i mults_rb =
+      _mm_set1_epi32((int)((uint32_t)CST(green_to_red_) << 16 |
+                           (CST(green_to_blue_) & 0xffff)));
+  const __m128i mults_b2 = _mm_set1_epi32(CST(red_to_blue_));
+#undef CST
+  const __m128i mask_ag = _mm_set1_epi32((int)0xff00ff00);
+  const __m128i perm1 = _mm_setr_epi8(-1, 1, -1, 1, -1, 5, -1, 5,
+                                      -1, 9, -1, 9, -1, 13, -1, 13);
+  const __m128i perm2 = _mm_setr_epi8(-1, 2, -1, -1, -1, 6, -1, -1,
+                                      -1, 10, -1, -1, -1, 14, -1, -1);
+  int i;
+  for (i = 0; i + 4 <= num_pixels; i += 4) {
+    const __m128i A = _mm_loadu_si128((const __m128i*)(src + i));
+    const __m128i B = _mm_shuffle_epi8(A, perm1); // argb -> g0g0
+    const __m128i C = _mm_mulhi_epi16(B, mults_rb);
+    const __m128i D = _mm_add_epi8(A, C);
+    const __m128i E = _mm_shuffle_epi8(D, perm2);
+    const __m128i F = _mm_mulhi_epi16(E, mults_b2);
+    const __m128i G = _mm_add_epi8(D, F);
+    const __m128i out = _mm_blendv_epi8(G, A, mask_ag);
+    _mm_storeu_si128((__m128i*)&dst[i], out);
+  }
+  // Fall-back to C-version for left-overs.
+  if (i != num_pixels) {
+    VP8LTransformColorInverse_C(m, src + i, num_pixels - i, dst + i);
+  }
+}
+
+//------------------------------------------------------------------------------
+
+#define ARGB_TO_RGB_SSE41 do {                        \
+  while (num_pixels >= 16) {                          \
+    const __m128i in0 = _mm_loadu_si128(in + 0);      \
+    const __m128i in1 = _mm_loadu_si128(in + 1);      \
+    const __m128i in2 = _mm_loadu_si128(in + 2);      \
+    const __m128i in3 = _mm_loadu_si128(in + 3);      \
+    const __m128i a0 = _mm_shuffle_epi8(in0, perm0);  \
+    const __m128i a1 = _mm_shuffle_epi8(in1, perm1);  \
+    const __m128i a2 = _mm_shuffle_epi8(in2, perm2);  \
+    const __m128i a3 = _mm_shuffle_epi8(in3, perm3);  \
+    const __m128i b0 = _mm_blend_epi16(a0, a1, 0xc0); \
+    const __m128i b1 = _mm_blend_epi16(a1, a2, 0xf0); \
+    const __m128i b2 = _mm_blend_epi16(a2, a3, 0xfc); \
+    _mm_storeu_si128(out + 0, b0);                    \
+    _mm_storeu_si128(out + 1, b1);                    \
+    _mm_storeu_si128(out + 2, b2);                    \
+    in += 4;                                          \
+    out += 3;                                         \
+    num_pixels -= 16;                                 \
+  }                                                   \
+} while (0)
+
+static void ConvertBGRAToRGB_SSE41(const uint32_t* src, int num_pixels,
+                                   uint8_t* dst) {
+  const __m128i* in = (const __m128i*)src;
+  __m128i* out = (__m128i*)dst;
+  const __m128i perm0 = _mm_setr_epi8(2, 1, 0, 6, 5, 4, 10, 9,
+                                      8, 14, 13, 12, -1, -1, -1, -1);
+  const __m128i perm1 = _mm_shuffle_epi32(perm0, 0x39);
+  const __m128i perm2 = _mm_shuffle_epi32(perm0, 0x4e);
+  const __m128i perm3 = _mm_shuffle_epi32(perm0, 0x93);
+
+  ARGB_TO_RGB_SSE41;
+
+  // left-overs
+  if (num_pixels > 0) {
+    VP8LConvertBGRAToRGB_C((const uint32_t*)in, num_pixels, (uint8_t*)out);
+  }
+}
+
+static void ConvertBGRAToBGR_SSE41(const uint32_t* src,
+                                   int num_pixels, uint8_t* dst) {
+  const __m128i* in = (const __m128i*)src;
+  __m128i* out = (__m128i*)dst;
+  const __m128i perm0 = _mm_setr_epi8(0, 1, 2, 4, 5, 6, 8, 9, 10,
+                                      12, 13, 14, -1, -1, -1, -1);
+  const __m128i perm1 = _mm_shuffle_epi32(perm0, 0x39);
+  const __m128i perm2 = _mm_shuffle_epi32(perm0, 0x4e);
+  const __m128i perm3 = _mm_shuffle_epi32(perm0, 0x93);
+
+  ARGB_TO_RGB_SSE41;
+
+  // left-overs
+  if (num_pixels > 0) {
+    VP8LConvertBGRAToBGR_C((const uint32_t*)in, num_pixels, (uint8_t*)out);
+  }
+}
+
+#undef ARGB_TO_RGB_SSE41
+
+//------------------------------------------------------------------------------
+// Entry point
+
+extern void VP8LDspInitSSE41(void);
+
+WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitSSE41(void) {
+  VP8LTransformColorInverse = TransformColorInverse_SSE41;
+  VP8LConvertBGRAToRGB = ConvertBGRAToRGB_SSE41;
+  VP8LConvertBGRAToBGR = ConvertBGRAToBGR_SSE41;
+}
+
+#else  // !WEBP_USE_SSE41
+
+WEBP_DSP_INIT_STUB(VP8LDspInitSSE41)
+
+#endif  // WEBP_USE_SSE41