https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77359
--- Comment #7 from David Edelsohn <dje at gcc dot gnu.org> --- It looks like STACK_DYNAMIC_OFFSET will behave correctly on AIX if Altivec or VSX is enabled. AIX increased the alignment when Altivec support was added. It appears that STACK_DYNAMIC_OFFSET should add a test for AIX. It does look like there could be a problem for PPC64 Linux, but it did not occur. It simply may be that recent GCC on PPC64 Linux defaults to processors with Altivec enabled, so the macros choose consistent values.
