i386.c (init_cumulative_args): Set mmx/sse registers available for use only when…

i386.c (init_cumulative_args): Set mmx/sse registers available for use only when TARGET_MMX/_SSE is set...

        * config/i386/i386.c (init_cumulative_args): Set mmx/sse registers
        available for use only when TARGET_MMX/_SSE is set, and check for
        variable argument function if any register count is non-zero.
        (function_arg): Correctly suppress repeated warnings for passing SSE
        vectors are arguments without SSE enabled.
        (ix86_function_arg_boundary): Without SSE enabled, the use of what
        would be SSE register modes does no longer influence the alignment.

From-SVN: r84431

gcc/ChangeLog

+2004-07-09  Jan Beulich  <jbeulich@novell.com>
+
+	* config/i386/i386.c (init_cumulative_args): Set mmx/sse registers
+	available for use only when TARGET_MMX/_SSE is set, and check for
+	variable argument function if any register count is non-zero.
+	(function_arg): Correctly suppress repeated warnings for passing SSE
+	vectors are arguments without SSE enabled.
+	(ix86_function_arg_boundary): Without SSE enabled, the use of what
+	would be SSE register modes does no longer influence the alignment.
+
 2004-07-09  Richard Henderson  <rth@redhat.com>
 
 	* builtins.c (std_gimplify_va_arg_expr): Deny ARGS_GROW_DOWNWARD.

gcc/config/i386/i386.c

@@ -1921,8 +1921,10 @@ init_cumulative_args (CUMULATIVE_ARGS *cum,  /* Argument info to initialize */
     cum->nregs = ix86_function_regparm (fntype, fndecl);
   else
     cum->nregs = ix86_regparm;
-  cum->sse_nregs = SSE_REGPARM_MAX;
-  cum->mmx_nregs = MMX_REGPARM_MAX;
+  if (TARGET_SSE)
+    cum->sse_nregs = SSE_REGPARM_MAX;
+  if (TARGET_MMX)
+    cum->mmx_nregs = MMX_REGPARM_MAX;
   cum->warn_sse = true;
   cum->warn_mmx = true;
   cum->maybe_vaarg = false;
@@ -1937,13 +1939,12 @@ init_cumulative_args (CUMULATIVE_ARGS *cum,  /* Argument info to initialize */
 	}
     }
 
-
   /* Determine if this function has variable arguments.  This is
      indicated by the last argument being 'void_type_mode' if there
      are no variable arguments.  If there are variable arguments, then
-     we won't pass anything in registers */
+     we won't pass anything in registers in 32-bit mode. */
 
-  if (cum->nregs || !TARGET_MMX || !TARGET_SSE)
+  if (cum->nregs || cum->mmx_nregs || cum->sse_nregs)
     {
       for (param = (fntype) ? TYPE_ARG_TYPES (fntype) : 0;
 	   param != 0; param = next_param)
@@ -2692,7 +2693,7 @@ function_arg (CUMULATIVE_ARGS *cum,	/* current arg information */
       case V2DFmode:
 	if (!type || !AGGREGATE_TYPE_P (type))
 	  {
-	    if (!TARGET_SSE && !warnedmmx && cum->warn_sse)
+	    if (!TARGET_SSE && !warnedsse && cum->warn_sse)
 	      {
 		warnedsse = true;
 		warning ("SSE vector argument without SSE enabled "
@@ -2839,7 +2840,9 @@ ix86_function_arg_boundary (enum machine_mode mode, tree type)
 	 The handling here differs from field_alignment.  ICC aligns MMX
 	 arguments to 4 byte boundaries, while structure fields are aligned
 	 to 8 byte boundaries.  */
-      if (!type)
+      if (!TARGET_SSE)
+	align = PARM_BOUNDARY;
+      else if (!type)
 	{
 	  if (!SSE_REG_MODE_P (mode))
 	    align = PARM_BOUNDARY;