https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106574
--- Comment #6 from Michael Hudson-Doyle <michael.hudson at canonical dot com> --- Are there any tips as to how to diagnose this further? I tried putting a math_opt_barrier on this line: https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/ieee754/ldbl-128/e_j1l.c;h=54c457681aecef079cb64d406ca89e05d2ce4fc5;hb=HEAD#l872 and it didn't help, although the failing test is hitting the case the SET_RESTORE_ROUNDL is in.