nvptx.c (nvptx_function_arg_boundary): New.

	* config/nvptx/nvptx.c (nvptx_function_arg_boundary): New.
	(TARGET_FUNCTION_ARG_BOUNDARY): Override.

	testsuite/
	* gcc.target/nvptx/abi-vararg-3.c: New.

From-SVN: r236345

gcc/ChangeLog

+2016-05-17  Nathan Sidwell  <nathan@acm.org>
+
+	* config/nvptx/nvptx.c (nvptx_function_arg_boundary): New.
+	(TARGET_FUNCTION_ARG_BOUNDARY): Override.
+
 2016-05-17  Mikhail Maltsev  <maltsevm@gmail.com>
 
 	PR tree-optimization/54579

gcc/config/nvptx/nvptx.c

@@ -464,6 +464,17 @@ nvptx_function_arg_advance (cumulative_args_t cum_v,
   cum->count++;
 }
 
+/* Implement TARGET_FUNCTION_ARG_BOUNDARY.
+
+   For nvptx This is only used for varadic args.  The type has already
+   been promoted and/or converted to invisible reference.  */
+
+static unsigned
+nvptx_function_arg_boundary (machine_mode mode, const_tree ARG_UNUSED (type))
+{
+  return GET_MODE_ALIGNMENT (mode);
+}
+
 /* Handle the TARGET_STRICT_ARGUMENT_NAMING target hook.
 
    For nvptx, we know how to handle functions declared as stdarg: by
@@ -4835,6 +4846,8 @@ nvptx_goacc_reduction (gcall *call)
 #define TARGET_FUNCTION_INCOMING_ARG nvptx_function_incoming_arg
 #undef TARGET_FUNCTION_ARG_ADVANCE
 #define TARGET_FUNCTION_ARG_ADVANCE nvptx_function_arg_advance
+#undef TARGET_FUNCTION_ARG_BOUNDARY
+#define TARGET_FUNCTION_ARG_BOUNDARY nvptx_function_arg_boundary
 #undef TARGET_PASS_BY_REFERENCE
 #define TARGET_PASS_BY_REFERENCE nvptx_pass_by_reference
 #undef TARGET_FUNCTION_VALUE_REGNO_P

gcc/testsuite/ChangeLog

+2016-05-17  Nathan Sidwell  <nathan@acm.org>
+
+	* gcc.target/nvptx/abi-vararg-3.c: New.
+
 2016-05-17  Mikhail Maltsev  <maltsevm@gmail.com>
 
 	PR tree-optimization/54579

gcc/testsuite/gcc.target/nvptx/abi-vararg-3.c

+/* { dg-do compile } */
+/* { dg-additional-options "-Wno-pedantic -Wno-long-long" } */
+
+/* 64-bit var args should be aligned to 64  bits.  */
+
+void Foo (const char *, ...);
+
+void Baz ()
+{
+  Foo ("", 0, 1ll);
+}
+
+/* { dg-final { scan-assembler "st.u64\t\\\[%stack\\+8\\\]," } } */