More xtensa assembler improvements.

examples/asm_xtensa.fs

@@ -0,0 +1,28 @@
+#! /usr/bin/env ueforth
+
+\ Copyright 2022 Bradley D. Nelson
+\
+\ Licensed under the Apache License, Version 2.0 (the "License");
+\ you may not use this file except in compliance with the License.
+\ You may obtain a copy of the License at
+\
+\     http://www.apache.org/licenses/LICENSE-2.0
+\
+\ Unless required by applicable law or agreed to in writing, software
+\ distributed under the License is distributed on an "AS IS" BASIS,
+\ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+\ See the License for the specific language governing permissions and
+\ limitations under the License.
+
+xtensa-assembler
+
+code my2*
+  a1 32 ENTRY,
+  a8 a2 0 L32I.N,
+  a8 a8 1 SLLI,
+  a8 a2 0 S32I.N,
+  RETW.N,
+end-code
+
+' my2* cell+ @ 20 disasm
+bye