[Mono] Add arm64 SIMD intrinsic for Vector64/128 Abs (#65086)

* [Mono] Add arm64 SIMD intrinsic for Vector64/128 Abs

Author: mkhamoyan

src/mono/mono/mini/simd-intrinsics.c

@@ -560,6 +560,7 @@ type_to_extract_op (MonoTypeEnum type)
 }
 
 static guint16 sri_vector_methods [] = {
+	SN_Abs,
 	SN_As,
 	SN_AsByte,
 	SN_AsDouble,
@@ -636,6 +637,23 @@ emit_sri_vector (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsi
 	MonoTypeEnum arg0_type = fsig->param_count > 0 ? get_underlying_type (fsig->params [0]) : MONO_TYPE_VOID;
 
 	switch (id) {
+	case SN_Abs: {
+#ifdef TARGET_ARM64
+		switch (arg0_type) {
+			case MONO_TYPE_U1:
+			case MONO_TYPE_U2:
+			case MONO_TYPE_U4:
+			case MONO_TYPE_U8:
+			case MONO_TYPE_U:
+			return NULL;
+			}
+		gboolean is_float = arg0_type == MONO_TYPE_R4 || arg0_type == MONO_TYPE_R8;
+		int iid = is_float ? INTRINS_AARCH64_ADV_SIMD_FABS : INTRINS_AARCH64_ADV_SIMD_ABS;
+		return emit_simd_ins_for_sig (cfg, klass, OP_XOP_OVR_X_X, iid, arg0_type, fsig, args);
+#else
+		return NULL;
+#endif
+}
 	case SN_As:
 	case SN_AsByte:
 	case SN_AsDouble: