https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67630
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2015-09-18 Ever confirmed|0 |1 --- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> --- ix86_compute_frame_layout has /* Align and set SSE register save area. */ if (frame->nsseregs) { /* The only ABI that has saved SSE registers (Win64) also has a 16-byte aligned default stack, and thus we don't need to be within the re-aligned local stack frame to save them. */ gcc_assert (INCOMING_STACK_BOUNDARY >= 128); offset = (offset + 16 - 1) & -16; offset += frame->nsseregs * 16; } It isn't true for interrupt handler.