https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109093
--- Comment #37 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Uroš Bizjak from comment #35) > (In reply to H.J. Lu from comment #17) > > Created attachment 54666 [details] > > A patch > > > > Change ix86_find_max_used_stack_alignment to find alignments of all stack > > slot accesses. > > HJ, it looks that the current detection of instructions that need increase > in stack alignment is insufficient, causing all sort of troubles (e.g. > __builtin_memset expansion in PR109780#c34 for stack variable hits this > issue). > > I see this problem as a defect in the x86 infrastructure (and the priority > of the bug reflects that) that should be urgently fixed. I think that the > direction your patch takes is the right approach, so I'd like to ask you to > post the patch to gcc-patches to get the ball rolling. > I uploaded an untested patch here. It may take several days for me to test it.
