Bring back unused implementation of type conversions (#66597)

Author: simonrozsival

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

@@ -859,7 +859,10 @@ static guint16 sri_vector_methods [] = {
 	SN_ConditionalSelect,
 	SN_ConvertToDouble,
 	SN_ConvertToInt32,
+	SN_ConvertToInt64,
+	SN_ConvertToSingle,
 	SN_ConvertToUInt32,
+	SN_ConvertToUInt64,
 	SN_Create,
 	SN_CreateScalar,
 	SN_CreateScalarUnsafe,
@@ -1049,6 +1052,33 @@ emit_sri_vector (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsi
 		return emit_simd_ins_for_sig (cfg, klass, op, -1, arg0_type, fsig, args);
 #else
 		return NULL;
+#endif
+	}
+	case SN_ConvertToInt64:
+	case SN_ConvertToUInt64: {
+#ifdef TARGET_ARM64
+		if (arg0_type != MONO_TYPE_R8)
+			return NULL;
+		MonoClass *arg_class = mono_class_from_mono_type_internal (fsig->params [0]);
+		int size = mono_class_value_size (arg_class, NULL);
+		int op = -1;
+		if (id == SN_ConvertToInt64)
+			op = size == 8 ? OP_ARM64_FCVTZS_SCALAR : OP_ARM64_FCVTZS;
+		else
+			op = size == 8 ? OP_ARM64_FCVTZU_SCALAR : OP_ARM64_FCVTZU;
+		return emit_simd_ins_for_sig (cfg, klass, op, -1, arg0_type, fsig, args);
+#else
+		return NULL;
+#endif
+	}
+	case SN_ConvertToSingle: {
+#ifdef TARGET_ARM64
+		if ((arg0_type != MONO_TYPE_I4) && (arg0_type != MONO_TYPE_U4))
+			return NULL;
+		int op = arg0_type == MONO_TYPE_I4 ? OP_ARM64_SCVTF : OP_ARM64_UCVTF;
+		return emit_simd_ins_for_sig (cfg, klass, op, -1, arg0_type, fsig, args);
+#else
+		return NULL;
 #endif
 	}
 	case SN_Create: {