https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100021
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> --- This is not vectorization, but the compiler uses vector registers to perform scalar operations. This is STV (scalar-to-vector) pass in action, you can use -mno-stv to avoid transformation. The transformation is used to avoid CMOV instruction.
