On Mon, May 15, 2017 at 10:00 PM, Daniel Santos <daniel.san...@pobox.com> wrote: > > Ian, would you mind looking at this please? A combination of my > -mcall-ms2sysv-xlogues patch with Bernd's patch is causing problems when > ix86_expand_split_stack_prologue() calls ix86_expand_call().
I don't have a lot of context here. I assume that ms2sysv is going to be used on Windows systems, where -fsplit-stack isn't really going to work anyhow, so I think it would probably be OK that reject that combination if it causes trouble. Also, it's overkill for ix86_expand_split_stack_prologue to call ix86_expand_call. The call is always to __morestack, and __morestack is written in assembler, so we could use a simpler version of ix86_expand_call if that helps. In particular we can decide that __morestack doesn't clobber any unusual registers, if that is what is causing the problem. Ian
