https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72827
--- Comment #13 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > Yes, it does! The tools appear to be building normally with this option. > Without it the build of gnattools fails almost immediately. > > I'll work on getting some dumps to see what is happening in DSE. Thanks in advance, that would be great. The weird dance with FP can certainly be a mightily confusing factor for the RTL DSE pass. On my side, I have bootstrapped on good old 32-bit PowerPC/Linux and Ada is in nominal shape here (we're slowing migrating to 64-bit... big-endian for now). Thanks to Marc, I'll try to reproduce the issue on gcc2-power8, but the system compiler doesn't come with Ada so this may take some time.