mn10300: Add attribute enabled.

This will allow merging am33 and mn103 patterns for which the
set of alternatives can't be merged via constraint letters.

From-SVN: r168674

gcc/ChangeLog

 2011-01-11  Richard Henderson  <rth@redhat.com>
 
+	* config/mn10300/mn10300.md (isa): New attribute.
+	(enabled): New attribute.
+
 	* config/mn10300/mn10300.md (absdf2, negdf2): Remove.
 	(abssf2, negsf2): Define only for hardware fp.
 	(sqrtsf2): Reformat.

gcc/config/mn10300/mn10300.md

@@ -46,6 +46,28 @@
 (define_attr "cpu" "mn10300,am33,am33_2,am34"
   (const (symbol_ref "(enum attr_cpu) mn10300_tune_cpu")))
 
+;; Used to control the "enabled" attribute on a per-instruction basis.
+(define_attr "isa" "base,am33,am33_2,am34"
+  (const_string "base"))
+
+(define_attr "enabled" ""
+  (cond [(eq_attr "isa" "base")
+         (const_int 1)
+
+         (and (eq_attr "isa" "am33")
+	      (ne (symbol_ref "TARGET_AM33") (const_int 0)))
+         (const_int 1)
+
+         (and (eq_attr "isa" "am33_2")
+	      (ne (symbol_ref "TARGET_AM33_2") (const_int 0)))
+         (const_int 1)
+        
+         (and (eq_attr "isa" "am34")
+	      (ne (symbol_ref "TARGET_AM34") (const_int 0)))
+         (const_int 1)
+	]
+	(const_int 0))
+)
 
 ;; Pipeline description.