* gas/m32r/error.exp: New error testcase driver.

* gas/m32r/wrongsize.s: New testcase.
PR 18135.

gas/testsuite/ChangeLog

@@ -6,6 +6,9 @@ start-sanitize-m32rx
 	* gas/m32r/fslotx.[sd]: New testcase.
 	* gas/m32r/m32rx.exp: Run it.
 	* gas/m32r/m32rx.[sd]: Update.
+
+	* gas/m32r/error.exp: New error testcase driver.
+	* gas/m32r/wrongsize.s: New testcase.
 end-sanitize-m32rx
 
 start-sanitize-r5900

gas/testsuite/gas/m32r/.Sanitize

@@ -15,7 +15,7 @@
 
 Do-first:
 
-m32rx_files="fslotx.s fslotx.d m32rx.s m32rx.d m32rx.exp"
+m32rx_files="fslotx.s fslotx.d m32rx.s m32rx.d m32rx.exp error.exp wrongsize.s"
 if ( echo $* | grep keep\-m32rx > /dev/null ) ; then
         keep_these_too="${m32rx_files} ${keep_these_too}"
 else

gas/testsuite/gas/m32r/error.exp

@@ -0,0 +1,13 @@
+# Test assembler warnings and errors.
+
+if [istarget m32r-*-*] {
+
+    load_lib gas-dg.exp
+
+    dg-init
+
+    dg-runtest "$srcdir/$subdir/wrongsize.s" "" ""
+
+    dg-finish
+
+}

gas/testsuite/gas/m32r/wrongsize.s

@@ -0,0 +1,10 @@
+; Test error messages in instances where an insn of a particular size
+; is required.
+
+; { dg-do assemble { target m32r-*-* } }
+
+wrongsize:
+	cmpi r8,#10 -> ldi r0,#8  ; { dg-error "not a 16 bit instruction" }
+	ldi r0,#8 -> cmpi r8,#10  ; { dg-error "not a 16 bit instruction" }
+	cmpi r8,#10 || ldi r0,#8  ; { dg-error "not a 16 bit instruction" }
+	ldi r0,#8 || cmpi r8,#10  ; { dg-error "not a 16 bit instruction" }