https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102492
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- It started with my r12-3654-ge5597f2ad55219092929dc12ea15e1edba06df18 then. Shorter testcase: struct S { S (int); }; void bar (S &); void foo () { #pragma omp simd for (int i = 0; i < 64; i++) { S s = 26; bar (s); } }