Fix bad use of FP reg in post-modify address.

	* config/ia64/ia64.h (INDEX_REG_CLASS): Define to GENERAL_REGS.
	(REGNO_OK_FOR_INDEX_P): Define to REGNO_OK_FOR_BASE_P.
	(LEGITIMATE_ADDRESS_DISP): Use LEGITIMATE_ADDRESS_REG.
	(REG_OK_FOR_INDEX): Define to REG_OK_FOR_BASE_P.

From-SVN: r36640

gcc/ChangeLog

+2000-09-25  Jim Wilson  <wilson@cygnus.com>
+
+	* config/ia64/ia64.h (INDEX_REG_CLASS): Define to GENERAL_REGS.
+	(REGNO_OK_FOR_INDEX_P): Define to REGNO_OK_FOR_BASE_P.
+	(LEGITIMATE_ADDRESS_DISP): Use LEGITIMATE_ADDRESS_REG.
+	(REG_OK_FOR_INDEX): Define to REG_OK_FOR_BASE_P.
+
 Tue 26-Sep-2000 00:16:22 BST  Neil Booth  <neilb@earthling.net>
 
         * cpplex.c (parse_args): Don't set VOID_REST flag.

gcc/config/ia64/ia64.h

@@ -978,8 +978,8 @@ enum reg_class
 /* A macro whose definition is the name of the class to which a valid index
    register must belong.  An index register is one used in an address where its
    value is either multiplied by a scale factor or added to another register
-   (as well as added to a displacement).  */
-#define INDEX_REG_CLASS NO_REGS
+   (as well as added to a displacement).  This is needed for POST_MODIFY.  */
+#define INDEX_REG_CLASS GENERAL_REGS
 
 /* A C expression which defines the machine-dependent operand constraint
    letters for register classes.  If CHAR is such a letter, the value should be
@@ -1004,8 +1004,9 @@ enum reg_class
 
 /* A C expression which is nonzero if register number NUM is suitable for use
    as an index register in operand addresses.  It may be either a suitable hard
-   register or a pseudo register that has been allocated such a hard reg.  */
-#define REGNO_OK_FOR_INDEX_P(NUM) 0
+   register or a pseudo register that has been allocated such a hard reg.
+   This is needed for POST_MODIFY.  */
+#define REGNO_OK_FOR_INDEX_P(NUM) REGNO_OK_FOR_BASE_P (NUM)
 
 /* A C expression that places additional restrictions on the register class to
    use when it is necessary to copy value X into a register in class CLASS.
@@ -1743,7 +1744,7 @@ do {									\
 #define LEGITIMATE_ADDRESS_DISP(R, X)					\
   (GET_CODE (X) == PLUS							\
    && rtx_equal_p (R, XEXP (X, 0))					\
-   && (GET_CODE (XEXP (X, 1)) == REG					\
+   && (LEGITIMATE_ADDRESS_REG (XEXP (X, 1))				\
        || (GET_CODE (XEXP (X, 1)) == CONST_INT				\
 	   && INTVAL (XEXP (X, 1)) >= -256				\
 	   && INTVAL (XEXP (X, 1)) < 256)))
@@ -1774,9 +1775,9 @@ do {									\
 #endif
 
 /* A C expression that is nonzero if X (assumed to be a `reg' RTX) is valid for
-   use as an index register.  */
+   use as an index register.  This is needed for POST_MODIFY.  */
 
-#define REG_OK_FOR_INDEX_P(X) 0
+#define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
 
 /* A C compound statement that attempts to replace X with a valid memory
    address for an operand of mode MODE.