https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94393
--- Comment #3 from Alan Modra <amodra at gmail dot com> --- There are two parts to fixing this PR. 1) We can do better in the sequences generated for some constants. 2) rs6000_rtx_costs needs to be accurate, so that expensive constants are put in memory and stay there with optimisation. Having looked at part 2 a little, I'd say fixes for that are definitely not stage 4 material.
