predicates.md (ax_reg_operand): New predicate.

	* config/i386/predicates.md (ax_reg_operand): New predicate.
	(memory_displacement_only_operand): New predicate.
	* config/i386/i386.md ("modrm" attribute): Return 0 if one
	operand is AX register and the other operand is memory operand
	with displacement only.

From-SVN: r107283

gcc/ChangeLog

 2005-11-21  Uros Bizjak  <uros@kss-loka.si>
 
+	* config/i386/predicates.md (ax_reg_operand): New predicate.
+	(memory_displacement_only_operand): New predicate.
+	* config/i386/i386.md ("modrm" attribute): Return 0 if one
+	operand is AX register and the other operand is memory operand
+	with displacement only.
+
+2005-11-21  Uros Bizjak  <uros@kss-loka.si>
+
 	* fold-const.c (fold_binary) <RDIV_EXPR>: Optimize A / A to 1.0 
 	if we don't care about NaNs or Infinities.
 

gcc/config/i386/i386.md

@@ -314,8 +314,12 @@
 	      (not (match_operand 0 "memory_operand" "")))
 	   (const_int 0)
 	 (and (eq_attr "type" "imov")
-	      (and (match_operand 0 "register_operand" "")
-	           (match_operand 1 "immediate_operand" "")))
+	      (ior (and (match_operand 0 "register_operand" "")
+			(match_operand 1 "immediate_operand" ""))
+		   (ior (and (match_operand 0 "ax_reg_operand" "")
+			     (match_operand 1 "memory_displacement_only_operand" ""))
+			(and (match_operand 0 "memory_displacement_only_operand" "")
+			     (match_operand 1 "ax_reg_operand" "")))))
 	   (const_int 0)
 	 (and (eq_attr "type" "call")
 	      (match_operand 0 "constant_call_address_operand" ""))

gcc/config/i386/predicates.md

@@ -75,6 +75,11 @@
   return REGNO (op) > LAST_VIRTUAL_REGISTER || REGNO (op) < 4;
 })
 
+;; Return true if op is the AX register.
+(define_predicate "ax_reg_operand"
+  (and (match_code "reg")
+       (match_test "REGNO (op) == 0")))
+
 ;; Return true if op is the flags register.
 (define_predicate "flags_reg_operand"
   (and (match_code "reg")
@@ -741,6 +746,22 @@
   return parts.disp != NULL_RTX;
 })
 
+;; Returns 1 if OP is memory operand with a displacement only.
+(define_predicate "memory_displacement_only_operand"
+  (match_operand 0 "memory_operand")
+{
+  struct ix86_address parts;
+  int ok;
+
+  ok = ix86_decompose_address (XEXP (op, 0), &parts);
+  gcc_assert (ok);
+
+  if (parts.base || parts.index)
+    return 0;
+
+  return parts.disp != NULL_RTX;
+})
+
 ;; Returns 1 if OP is memory operand that cannot be represented
 ;; by the modRM array.
 (define_predicate "long_memory_operand"