https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79072
--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Comment 5 code example gives incorrect results with the 7.1.0 release, > but correct results with 6.3 and 5.2 -- a regression. Likely caused by revision r241439. AFAICT this could be two different PRs.