i386: Align stack frame if argument is passed on stackhjl/pr83330/gcc-7-branch

When a function call is removed, it may become a leaf function.  But if
argument may be passed on stack, we need to align the stack frame when
there is no tail call.

Tested on Linux/i686 and Linux/x86-64.

gcc/

	Backport from mainline
	PR target/83330
	* config/i386/i386.c (ix86_function_arg_advance): Set
	outgoing_args_on_stack to true if there are outgoing arguments
	on stack.
	(ix86_function_arg): Likewise.
	(ix86_compute_frame_layout): Align stack frame if argument is
	passed on stack.
	* config/i386/i386.h (machine_function): Add
	outgoing_args_on_stack.

gcc/testsuite/

	Backport from mainline
	PR target/83330
	* gcc.target/i386/pr83330.c: New test.

1 files changed, 29 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.target/i386/pr83330.c b/gcc/testsuite/gcc.target/i386/pr83330.c
new file mode 100644
index 00000000000..9040168377a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr83330.c
@@ -0,0 +1,29 @@
+/* { dg-do run { target int128 } } */
+/* { dg-options "-O2 -fno-tree-dce -mno-push-args" } */
+
+typedef unsigned long long u64;
+typedef unsigned __int128 u128;
+
+u64 v;
+u64 g;
+
+u64 __attribute__ ((noinline, noclone))
+bar (u128 d, u64 e, u64 f, u64 g, u128 h)
+{
+  (void)d, (void)e, (void)f, (void)g, (void)h;
+  return 0;
+}
+
+static u64
+foo (void)
+{
+  (void)(v - bar (0, 0, 0, 0, 0));
+  return g;
+}
+
+int
+main (void)
+{
+  (void)foo ();
+  return 0;
+}