https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68018
--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Zdenek Sojka from comment #2) > I am also seeing this (or another in ix86_compute_frame_layout) ICE when > running the gfortran testsuite. Again with -mstackrealing. I will post the > testcase when I get home. -mstackrealign is a new functionality on MS_ABI targets, and there are some places in the compiler that assume that these targets are always aligned to 16bytes. This alignment is in fact mandated by ABI, and all deviations can be considered ABI violations. However, we can relax this restriction in order to handle rough applications that misalign the stack, but this should in general be an exception, not the rule. That said, even if -mstackrealign can be declared as unsupported on MS_ABI targets, the infrastructure handles realignment just fine also for MS_ABI targets, we just need to enable correct code paths when incoming stack boundary is less than 16 bytes. This is exactly what the patch in comment #1 does. BTW: I'm not in the position to test MS_ABI targets thoroughly, so I'd ask you to please conduct your tests with the patch from Comment #1.
