https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61300
Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
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Status|NEW |ASSIGNED
CC| |amodra at gmail dot com
Assignee|unassigned at gcc dot gnu.org |amodra at gmail dot com
--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
So, the "writes way past this" is writing into the parameter save area.
compare_kr is assuming that it was called with a parameter save area because it
isn't prototyped, but that is quite wrong because when compiling the function
body we don't know how the function was called. A call may well have a
prototype in scope, and thus not set up a parameter save area.
It's a bug in rs6000_function_parms_need_stack. This function can't blindly
test !prototype_p (fun).
