mn10300.h (TARGET_SWITCHES): Add -mmult-bug and -mno-mult-bug.

        * mn10300.h (TARGET_SWITCHES): Add -mmult-bug and -mno-mult-bug.
        (TARGET_MULT_BUG): Define.
        (TARGET_DEFAULT): Default to TARGET_MULT_BUG.
        * mn10300.md (mulsi3): Handle TARGET_MULT_BUG.

From-SVN: r16173

gcc/ChangeLog

+Sat Oct 25 12:20:58 1997  Jeffrey A Law  (law@cygnus.com)
+
+	* mn10300.h (TARGET_SWITCHES): Add -mmult-bug and -mno-mult-bug.
+	(TARGET_MULT_BUG): Define.
+	(TARGET_DEFAULT): Default to TARGET_MULT_BUG.
+	* mn10300.md (mulsi3): Handle TARGET_MULT_BUG.
+
 Fri Oct 24 17:40:34 1997  Jeffrey A Law  (law@cygnus.com)
 
 	* mn10200.c (indirect_memory_operand): Delete unused function.

gcc/config/mn10300/mn10300.h

@@ -49,11 +49,15 @@ extern struct rtx_def *zero_areg;
    where VALUE is the bits to set or minus the bits to clear.
    An empty string NAME is used to identify the default VALUE.  */
 
+/* Generate code to work around mul/mulq bugs on the mn10300.  */
+#define TARGET_MULT_BUG			(target_flags & 0x1)
 #define TARGET_SWITCHES  \
-  {{ "", TARGET_DEFAULT}}
+  {{ "mult-bug",	0x1},	\
+   { "no-mult-bug", 	-0x1},	\
+   { "", TARGET_DEFAULT}}
 
 #ifndef TARGET_DEFAULT
-#define TARGET_DEFAULT 0
+#define TARGET_DEFAULT 0x1
 #endif
 
 /* Print subsidiary information on the compiler version in use.  */

gcc/config/mn10300/mn10300.md

@@ -730,7 +730,13 @@
 	(mult:SI (match_operand:SI 1 "register_operand" "%0")
 		 (match_operand:SI 2 "register_operand" "d")))]
   ""
-  "mul %2,%0"
+  "*
+{
+  if (TARGET_MULT_BUG)
+    return \"nop\;nop\;mul %2,%0\";
+  else
+    return \"mul %2,%0\";
+}"
   [(set_attr "cc" "set_zn")])
 
 (define_insn "udivmodsi4"