Fix for aliasing problem reported by Michael Matz.

	* config/ia64/ia64.h (FUNCTION_ARG_REGNO_P): Use AR_REG_FIRST not
	GR_ARG_FIRST.

From-SVN: r74120

gcc/ChangeLog

+2003-12-01  James E Wilson  <wilson@specifixinc.com>
+
+	* config/ia64/ia64.h (FUNCTION_ARG_REGNO_P): Use AR_REG_FIRST not
+	GR_ARG_FIRST.
+
 2003-12-01  Zack Weinberg  <zack@codesourcery.com>
 
 	* common.opt: Remove -fgnu-linker.

gcc/config/ia64/ia64.h

@@ -1383,7 +1383,7 @@ do {									\
    On many machines, no registers can be used for this purpose since all
    function arguments are pushed on the stack.  */
 #define FUNCTION_ARG_REGNO_P(REGNO) \
-(((REGNO) >= GR_ARG_FIRST && (REGNO) < (GR_ARG_FIRST + MAX_ARGUMENT_SLOTS)) \
+(((REGNO) >= AR_ARG_FIRST && (REGNO) < (AR_ARG_FIRST + MAX_ARGUMENT_SLOTS)) \
  || ((REGNO) >= FR_ARG_FIRST && (REGNO) < (FR_ARG_FIRST + MAX_ARGUMENT_SLOTS)))
 
 /* Implement `va_arg'.  */