https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68018
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Some parts of gcc still assume that MS_ABI stack is always aligned to 128bits.
Proposed patch:
--cut here--
@@ -11283,7 +11296,8 @@ ix86_compute_frame_layout (struct ix86_frame *fram
function prologues and leaf. */
if ((TARGET_64BIT_MS_ABI && crtl->preferred_stack_boundary < 128)
&& (!crtl->is_leaf || cfun->calls_alloca != 0
- || ix86_current_function_calls_tls_descriptor))
+ || ix86_current_function_calls_tls_descriptor
+ || ix86_incoming_stack_boundary < 128))
{
crtl->preferred_stack_boundary = 128;
crtl->stack_alignment_needed = 128;
--cut here--
