deps: add simdutf dependency

Makefile

@@ -170,6 +170,7 @@ with-code-cache test-code-cache:
 
 out/Makefile: config.gypi common.gypi node.gyp \
 	deps/uv/uv.gyp deps/llhttp/llhttp.gyp deps/zlib/zlib.gyp \
+	deps/simdutf/simdutf.gyp \
 	tools/v8_gypfiles/toolchain.gypi tools/v8_gypfiles/features.gypi \
 	tools/v8_gypfiles/inspector.gypi tools/v8_gypfiles/v8.gyp
 	$(PYTHON) tools/gyp_node.py -f make

deps/simdutf/README.md

@@ -0,0 +1,14 @@
+# simdutf
+
+This project boosts unicode validation and transcoding performance by 
+utilizing SIMD operations where possible.
+
+The source is pulled from: https://github.com/simdutf/simdutf
+
+Active development occurs in the default branch (currently named `master`).
+
+## Updating
+
+```sh
+$ git clone https://github.com/simdutf/simdutf
+```

deps/simdutf/simdutf.gyp

@@ -0,0 +1,122 @@
+{
+  'variables': {
+    'arm_fpu%': '',
+    'target_arch%': '',
+  },
+  'targets': [
+    {
+      'target_name': 'simdutf',
+      'type': 'static_library',
+      'include_dirs': ['.'],
+      'sources': ['simdutf.cpp'],
+      'conditions': [
+        [ 'arm_fpu=="neon" and target_arch=="arm"', {
+          'dependencies': [ 'simdutf_neon32' ],
+        }],
+
+        # arm64 requires NEON, so it's safe to always use it
+        [ 'target_arch=="arm64"', {
+          'dependencies': [ 'simdutf_neon64' ],
+        }],
+
+        # Runtime detection will happen for x86 CPUs
+        [ 'target_arch in "ia32 x64 x32"', {
+          'dependencies': [
+            'simdutf_sse42',
+            'simdutf_avx',
+            'simdutf_avx2',
+          ],
+        }],
+      ],
+    },
+
+    {
+      'target_name': 'simdutf_neon32',
+      'type': 'static_library',
+      'include_dirs': ['.'],
+      'sources': ['simdutf.cpp'],
+      'cflags': [ '-Wno-unused-function' ],
+      'conditions': [
+        [ 'OS!="win"', {
+          'cflags': [ '-mfpu=neon' ],
+          'xcode_settings': {
+            'OTHER_CFLAGS': [ '-mfpu=neon' ]
+          },
+        }],
+      ],
+    },
+
+    {
+      'target_name': 'simdutf_neon64',
+      'type': 'static_library',
+      'include_dirs': ['.'],
+      'sources': ['simdutf.cpp'],
+      'cflags': [ '-Wno-unused-function' ],
+      # NEON is required in arm64, so no -mfpu flag is needed
+    },
+
+    {
+      'target_name': 'simdutf_avx',
+      'type': 'static_library',
+      'include_dirs': ['.'],
+      'sources': ['simdutf.cpp'],
+      'cflags': [ '-Wno-unused-function' ],
+      'conditions': [
+        [ 'OS!="win"', {
+          'cflags': [ '-mavx' ],
+          'xcode_settings': {
+            'OTHER_CFLAGS': [ '-mavx' ]
+          },
+        }, {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': [
+                '/arch:AVX'
+              ],
+            },
+          },
+        }],
+      ],
+    },
+
+    {
+      'target_name': 'simdutf_avx2',
+      'type': 'static_library',
+      'include_dirs': ['.'],
+      'sources': ['simdutf.cpp'],
+      'cflags': [ '-Wno-unused-function' ],
+      'conditions': [
+        [ 'OS!="win"', {
+          'cflags': [ '-mavx2' ],
+          'xcode_settings': {
+            'OTHER_CFLAGS': [ '-mavx2' ]
+          },
+        }, {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': [
+                '/arch:AVX2'
+              ],
+            },
+          },
+        }],
+      ],
+    },
+
+    {
+      'target_name': 'simdutf_sse42',
+      'type': 'static_library',
+      'include_dirs': ['.'],
+      'sources': ['simdutf.cpp'],
+      'cflags': [ '-Wno-unused-function' ],
+      'conditions': [
+        [ 'OS!="win"', {
+          'cflags': [ '-msse4.2' ],
+          'xcode_settings': {
+            'OTHER_CFLAGS': [ '-msse4.2' ]
+          },
+        }],
+      ],
+    },
+  ]
+}