PR target/34281

	* config/arm/arm.c (arm_setup_incoming_varargs): If last named
	argument needs double word alignment and cum->nregs is odd, account
	for the inserted padding.

	* gcc.c-torture/execute/20071213-1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@131196 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 73 insertions, 4 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c3dc9526ed3..996e71584f8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2007-12-27  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/34281
+	* config/arm/arm.c (arm_setup_incoming_varargs): If last named
+	argument needs double word alignment and cum->nregs is odd, account
+	for the inserted padding.
+
 	PR debug/34535
 	* tree-mudflap.c (mf_make_builtin): Make decl artificial
 	and don't emit debug info for it.
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 5b3b7035c15..ea9719a5d6e 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -17765,14 +17765,20 @@ arm_output_load_gr (rtx *operands)
 
 static void
 arm_setup_incoming_varargs (CUMULATIVE_ARGS *cum,
-			    enum machine_mode mode ATTRIBUTE_UNUSED,
-			    tree type ATTRIBUTE_UNUSED,
+			    enum machine_mode mode,
+			    tree type,
 			    int *pretend_size,
 			    int second_time ATTRIBUTE_UNUSED)
 {
+  int nregs = cum->nregs;
+  if (nregs & 1
+      && ARM_DOUBLEWORD_ALIGN
+      && arm_needs_doubleword_align (mode, type))
+    nregs++;
+
   cfun->machine->uses_anonymous_args = 1;
-  if (cum->nregs < NUM_ARG_REGS)
-    *pretend_size = (NUM_ARG_REGS - cum->nregs) * UNITS_PER_WORD;
+  if (nregs < NUM_ARG_REGS)
+    *pretend_size = (NUM_ARG_REGS - nregs) * UNITS_PER_WORD;
 }
 
 /* Return nonzero if the CONSUMER instruction (a store) does not need
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 2374f35d8e2..6f3fc359885 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2007-12-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/34281
+	* gcc.c-torture/execute/20071213-1.c: New test.
+
 2007-12-25  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libfortran/34560
diff --git a/gcc/testsuite/gcc.c-torture/execute/20071213-1.c b/gcc/testsuite/gcc.c-torture/execute/20071213-1.c
new file mode 100644
index 00000000000..cbdfaa56c23
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20071213-1.c
@@ -0,0 +1,53 @@
+/* PR target/34281 */
+
+#include <stdarg.h>
+
+extern void abort (void);
+
+void
+h (int x, va_list ap)
+{
+  switch (x)
+    {
+    case 1:
+      if (va_arg (ap, int) != 3 || va_arg (ap, int) != 4)
+	abort ();
+      return;
+    case 5:
+      if (va_arg (ap, int) != 9 || va_arg (ap, int) != 10)
+	abort ();
+      return;
+    default:
+      abort ();
+    }
+}
+
+void
+f1 (int i, long long int j, ...)
+{
+  va_list ap;
+  va_start (ap, j);
+  h (i, ap);
+  if (i != 1 || j != 2)
+    abort ();
+  va_end (ap);
+}
+
+void
+f2 (int i, int j, int k, long long int l, ...)
+{
+  va_list ap;
+  va_start (ap, l);
+  h (i, ap);
+  if (i != 5 || j != 6 || k != 7 || l != 8)
+    abort ();
+  va_end (ap);
+}
+
+int
+main ()
+{
+  f1 (1, 2, 3, 4);
+  f2 (5, 6, 7, 8, 9, 10);
+  return 0;
+}