https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100021
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> --- Also, you are passing -march=sandybridge, but the profiler seems to show Skylake (SKX) target. The STV pass heavily depends on target costs, and when -march=skylake is passed, the conversion is avoided.
