re PR target/36800 (va_arg for _Decimal128 on 32-bit Power mishandled in certain cases)

PR target/36800

	PR target/36800
	* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): Do not set
	regalign for the reg == fpr and TDmode case.

testsuite/
	* gcc.dg/dfp/pr36800.c: New.

Co-Authored-By: Joseph Myers <joseph@codesourcery.com>

From-SVN: r145859

gcc/ChangeLog

+2009-04-10  Ben Elliston  <bje@au.ibm.com>
+
+	PR target/36800
+	* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): Do not set
+	regalign for the reg == fpr and TDmode case.
+
 2009-04-09  David Ayers  <ayers@fsfe.org>
 
 	PR objc/29200

gcc/config/rs6000/rs6000.c

@@ -7092,7 +7092,6 @@ rs6000_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
 	 reg number is 0 for f1, so we want to make it odd.  */
       else if (reg == fpr && TYPE_MODE (type) == TDmode)
 	{
-	  regalign = 1;
 	  t = build2 (BIT_IOR_EXPR, TREE_TYPE (reg), unshare_expr (reg),
 		      build_int_cst (TREE_TYPE (reg), 1));
 	  u = build2 (MODIFY_EXPR, void_type_node, unshare_expr (reg), t);

gcc/testsuite/ChangeLog

+2009-04-10  Ben Elliston  <bje@au.ibm.com>
+	    Joseph Myers  <joseph@codesourcery.com>
+
+	PR target/36800
+	* gcc.dg/dfp/pr36800.c: New.
+
 2009-04-09  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 	    Rafael Avila de Espindola  <espindola@google.com>
 

gcc/testsuite/gcc.dg/dfp/pr36800.c

+/* { dg-do run } */
+/* { dg-options "-std=gnu99" } */
+
+#include <stdarg.h>
+extern void abort (void);
+
+void
+f (int a, ...)
+{
+  va_list ap;
+  if (a != 0)
+    abort ();
+  va_start (ap, a);
+  if (va_arg (ap, _Decimal128) != 1.2DL)
+    abort ();
+  if (va_arg (ap, _Decimal128) != 2.34DL)
+    abort ();
+  if (va_arg (ap, _Decimal128) != 3.456DL)
+    abort ();
+  if (va_arg (ap, _Decimal128) != 4.567DL)
+    abort ();
+  if (va_arg (ap, double) != 5.125)
+    abort ();
+  va_end (ap);
+}
+
+int
+main (void)
+{
+  f (0, 1.2DL, 2.34DL, 3.456DL, 4.567DL, 5.125);
+  return 0;
+}