re PR target/36015 (-mregparm and fn decls without arguments)

	PR target/36015
	* config/i386/i386.c (init_cumulative_args): Don't pass anything
	in registers for -m32 only if stdarg_p (fntype).

	* gcc.dg/pr36015.c: New test.

From-SVN: r134621

gcc/ChangeLog

+2008-04-24  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/36015
+	* config/i386/i386.c (init_cumulative_args): Don't pass anything
+	in registers for -m32 only if stdarg_p (fntype).
+
 2008-04-24  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR rtl-optimization/36006

gcc/config/i386/i386.c

@@ -3552,7 +3552,7 @@ init_cumulative_args (CUMULATIVE_ARGS *cum,  /* Argument info to initialize */
     {
       /* If there are variable arguments, then we won't pass anything
          in registers in 32-bit mode. */
-      if (cum->maybe_vaarg)
+      if (stdarg_p (fntype))
 	{
 	  cum->nregs = 0;
 	  cum->sse_nregs = 0;

gcc/testsuite/ChangeLog

+2008-04-24  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/36015
+	* gcc.dg/pr36015.c: New test.
+
 2008-04-24  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
 	PR rtl-optimization/36006

gcc/testsuite/gcc.dg/pr36015.c

+/* PR target/36015 */
+/* { dg-do run } */
+/* { dg-options "-O0" } */
+/* { dg-options "-O0 -mregparm=3" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
+
+static int test ();
+
+int
+main (void)
+{
+  test (0, 1, 2, 3, 4, 5, 6, 7);
+  return 0;
+}
+
+static int
+test (int a, int b, int c, int d, int e, int f, int g, int h)
+{
+  if (a != 0 || b != 1 || c != 2 || d != 3
+      || e != 4 || f != 5 || g != 6 || h != 7)
+    __builtin_abort ();
+  return 0;
+}