* 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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@107283 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b4ff1f8..c9e309a 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,13 @@
 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.
 

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index b739e50..00ba829 100644 (file)
--- a/gcc/config/i386/i386.md
+++ b/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" ""))

diff --git a/gcc/config/i386/predicates.md b/gcc/config/i386/predicates.md
index b61d2d2..4a7d88a 100644 (file)
--- a/gcc/config/i386/predicates.md
+++ b/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"