https://chromium-review.googlesource.com/c/libyuv/libyuv/+/6241803 (rebased)
https://chromium-review.googlesource.com/c/libyuv/libyuv/+/6241804

diff --git a/libyuv.gyp b/libyuv.gyp
--- a/libyuv.gyp
+++ b/libyuv.gyp
@@ -26,15 +26,30 @@
     'clang%': 0,
     # Link-Time Optimizations.
     'use_lto%': 0,
+    # Enable LASX on LoongArch by default.
+    "loong_lasx%": 1,
+    # Enable LSX on LoongArch by default. Has no effect if loong_lasx is
+    # enabled because LASX implies LSX according to the architecture specs.
+    "loong_lsx%": 1,
     'mips_msa%': 0,  # Default to msa off.
     'build_neon': 0,
+    "build_lasx": 0,
+    "build_lsx": 0,
     'build_msa': 0,
+
     'conditions': [
        ['(target_arch == "armv7" or target_arch == "armv7s" or \
        (target_arch == "arm" and arm_version >= 7) or target_arch == "arm64")\
        and (arm_neon == 1 or arm_neon_optional == 1)', {
          'build_neon': 1,
        }],
+       ['(target_arch == "loong64") and (loong_lasx == 1)', {
+         "build_lasx": 1,
+         "build_lsx": 1,  # LASX implies LSX.
+       }],
+       ['(target_arch == "loong64") and (loong_lsx == 1)', {
+         "build_lsx": 1,
+       }],
        ['(target_arch == "mipsel" or target_arch == "mips64el")\
        and (mips_msa == 1)',
        {
@@ -60,6 +75,16 @@
             '-Wno-unused-parameter',
          ],
         }],
+        ["build_lasx != 0", {
+          "cflags": ["-mlasx"],
+        }, {  # build_lasx == 0
+          "cflags": ["-mno-lasx"],
+        }],
+        ["build_lsx != 0", {
+          "cflags": ["-mlsx"],
+        }, {  # build_lsx == 0
+          "cflags": ["-mno-lsx"],
+        }],
         ['build_neon != 0', {
           'defines': [
             'LIBYUV_NEON',
diff --git a/libyuv.gypi b/libyuv.gypi
--- a/libyuv.gypi
+++ b/libyuv.gypi
@@ -42,6 +42,7 @@
       'include/libyuv/convert_from.h',
       'include/libyuv/convert_from_argb.h',
       'include/libyuv/cpu_id.h',
+      'include/libyuv/cpu_support.h',
       'include/libyuv/loongson_intrinsics.h',
       'include/libyuv/macros_msa.h',
       'include/libyuv/mjpeg_decoder.h',
@@ -80,18 +81,22 @@
       'source/rotate_argb.cc',
       'source/rotate_common.cc',
       'source/rotate_gcc.cc',
+      'source/rotate_lsx.cc',
       'source/rotate_msa.cc',
       'source/rotate_win.cc',
       'source/row_any.cc',
       'source/row_common.cc',
       'source/row_gcc.cc',
       'source/row_msa.cc',
+      'source/row_lasx.cc',
+      'source/row_lsx.cc',
       'source/row_win.cc',
       'source/scale.cc',
       'source/scale_any.cc',
       'source/scale_argb.cc',
       'source/scale_common.cc',
       'source/scale_gcc.cc',
+      'source/scale_lsx.cc',
       'source/scale_msa.cc',
       'source/scale_rgb.cc',
       'source/scale_uv.cc',