https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88587
--- Comment #1 from Nickolay Kolchin-Semyonov <nbkolchin at gmail dot com> --- Error seems to happen when both: 1. Vector extensions are used. 2. Both SSE and non-SSE versions are requested. Error seems to be present in all GCC versions since 6.1 (which introduced target_clones).