mn10300.md (cmpsi): Fix first alternative's output template.

2001-03-28  Matthew Hiller  <hiller@redhat.com>

	* config/mn10300/mn10300.md (cmpsi): Fix first alternative's
	output template.

	* MAINTAINERS: Added self.

From-SVN: r40956

MAINTAINERS

@@ -124,6 +124,7 @@ Anthony Green					green@redhat.com
 Stu Grossman					grossman@redhat.com
 Andrew Haley					aph@redhat.com
 Aldy Hernandez					aldyh@redhat.com
+Matthew Hiller					hiller@redhat.com
 Kazu Hirata					kazu@hxi.com
 Manfred Hollstein				mhollstein@redhat.com
 Jan Hubicka					hubicka@freesoft.cz

gcc/ChangeLog

+2001-03-28  Matthew Hiller  <hiller@redhat.com>
+
+	* config/mn10300/mn10300.md (cmpsi): Fix first alternative's
+	output template.
+
+	* MAINTAINERS: Added self.
+	
 2001-03-28  Richard Henderson  <rth@redhat.com>
 
 	* Makefile.in (cs-tconfig.h): Depend on CONFIG_H, not GCONFIG_H.

gcc/config/mn10300/mn10300.md

@@ -709,15 +709,23 @@
   "* return output_tst (operands[0], insn);"
   [(set_attr "cc" "set_znv")])
 
+;; Ordinarily, the cmp instruction will set the Z bit of cc0 to 1 if
+;; its operands hold equal values, but the operands of a cmp
+;; instruction must be distinct registers.  In the case where we'd
+;; like to compare a register to itself, we can achieve this effect
+;; with a btst 0,d0 instead.  (This will not alter the contents of d0
+;; but will have the proper effect on cc0.  Using d0 is arbitrary; any
+;; data register would work.)
+
 (define_insn "cmpsi"
   [(set (cc0)
-	(compare (match_operand:SI 0 "register_operand" "!*d*a*x,dax")
-		 (match_operand:SI 1 "nonmemory_operand" "!*0,daxi")))]
+	(compare (match_operand:SI 0 "register_operand" "*d*a*x,dax")
+		 (match_operand:SI 1 "nonmemory_operand" "*0,daxi")))]
   ""
   "@
-  add 0,%0
+  btst 0,d0
   cmp %1,%0"
-  [(set_attr "cc" "invert,compare")])
+  [(set_attr "cc" "compare,compare")])
 
 ;; ----------------------------------------------------------------------
 ;; ADD INSTRUCTIONS