https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82221
--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
Try this one:
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 4f0414ffa9d..ee27273c80d 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -13801,6 +13801,7 @@ ix86_get_drap_rtx (void)
/* We must use DRAP if there are outgoing arguments on stack and
ACCUMULATE_OUTGOING_ARGS is false. */
if (ix86_force_drap
+ || !crtl->sp_is_unchanging
|| (cfun->machine->outgoing_args_on_stack
&& !ACCUMULATE_OUTGOING_ARGS))
crtl->need_drap = true;
to see what the generated code looks like.
