sparc.c (function_arg_union_value): New 'slotno' argument.

	* config/sparc/sparc.c (function_arg_union_value): New 'slotno'
	argument.  When the union is passed in the 6th slot, build a
	PARALLEL with only one element.
	(function_arg): Adjust call to function_arg_union_value.
	(function_value): Likewise.

From-SVN: r90396

1 files changed, 28 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/union-2.c b/gcc/testsuite/gcc.dg/union-2.c
new file mode 100644
index 0000000..edc8a7a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/union-2.c
@@ -0,0 +1,28 @@
+/* This used to segfault on SPARC 64-bit at runtime because
+   the stack pointer was clobbered by the function call.   */
+
+/* { dg-do run } */
+
+#include <stdarg.h>
+
+union U
+{
+  long l1[2];
+};
+
+union U u;
+
+void foo (int z, ...)
+{
+  int i;
+  va_list ap;
+  va_start(ap,z);
+  i = va_arg(ap, int);
+  va_end(ap);
+}
+
+int main(void)
+{
+  foo (1, 1, 1, 1, 1, u);
+  return 0;
+}