https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91362
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- This is an alias violation for sure. You write ctx->c as uint64_t and then read it as uint32_t in a few places. Even inside gascon_rotr64_interleaved2 too. Either use an union of (array of uint32_t) and an uint64_t or use memcpy to read as uint32_t.