re PR target/17052 (altivec varargs failure if no optimization)

	PR target/17052
	* config/rs6000/rs6000.h (machine_function): Remove sysv_varargs_p.
	* config/rs6000/sysv4.h (RS6000_VARARGS_AREA): Use
	current_function_stdarg in place of sysv_varargs_p.
	* config/rs6000/rs6000.c (setup_incoming_varargs): Don't set
	sysv_varargs_p.

From-SVN: r86533

gcc/ChangeLog

+2004-08-25  Alan Modra  <amodra@bigpond.net.au>
+
+	PR target/17052
+	* config/rs6000/rs6000.h (machine_function): Remove sysv_varargs_p.
+	* config/rs6000/sysv4.h (RS6000_VARARGS_AREA): Use
+	current_function_stdarg in place of sysv_varargs_p.
+	* config/rs6000/rs6000.c (setup_incoming_varargs): Don't set
+	sysv_varargs_p.
+
 2004-08-24  Richard Henderson  <rth@redhat.com>
 
 	PR target/16298

gcc/config/rs6000/rs6000.c

@@ -5304,8 +5304,6 @@ setup_incoming_varargs (CUMULATIVE_ARGS *cum, enum machine_mode mode,
 
   if (DEFAULT_ABI == ABI_V4)
     {
-      /* Indicate to allocate space on the stack for varargs save area.  */
-      cfun->machine->sysv_varargs_p = 1;
       if (! no_rtl)
 	save_area = plus_constant (virtual_stack_vars_rtx,
 				   - RS6000_VARARGS_SIZE);
@@ -5316,7 +5314,6 @@ setup_incoming_varargs (CUMULATIVE_ARGS *cum, enum machine_mode mode,
     {
       first_reg_offset = next_cum.words;
       save_area = virtual_incoming_args_rtx;
-      cfun->machine->sysv_varargs_p = 0;
 
       if (targetm.calls.must_pass_in_stack (mode, type))
 	first_reg_offset += rs6000_arg_size (TYPE_MODE (type), type);

gcc/config/rs6000/rs6000.h

@@ -1639,8 +1639,6 @@ extern enum rs6000_abi rs6000_current_abi;	/* available for use by subtarget */
    This is added to the cfun structure.  */
 typedef struct machine_function GTY(())
 {
-  /* Whether a System V.4 varargs area was created.  */
-  int sysv_varargs_p;
   /* Flags if __builtin_return_address (n) with n >= 1 was used.  */
   int ra_needs_full_frame;
   /* Some local-dynamic symbol.  */

gcc/config/rs6000/sysv4.h

@@ -332,7 +332,7 @@ do {									\
 /* Size of the V.4 varargs area if needed.  */
 /* Override rs6000.h definition.  */
 #undef	RS6000_VARARGS_AREA
-#define RS6000_VARARGS_AREA ((cfun->machine->sysv_varargs_p) ? RS6000_VARARGS_SIZE : 0)
+#define RS6000_VARARGS_AREA (current_function_stdarg ? RS6000_VARARGS_SIZE : 0)
 
 /* Override default big endianism definitions in rs6000.h.  */
 #undef	BYTES_BIG_ENDIAN