https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104683
--- Comment #4 from Preston Crow <pc-gcc22 at crowcastle dot net> --- I can see how it's documented, but many people reading that won't realize that the instruction sets don't match all Haswell chips. Simply adding a line below that to say "Note: Some lower-end Haswell processors do not include all of the above instruction sets." And do the same for the others. Then at least anyone reading the documentation will immediately be aware of the potential problem and hopefully avoid using them in inappropriate situations.
