https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86029
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2018-06-02 CC| |hjl.tools at gmail dot com Ever confirmed|0 |1 --- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> --- Since you used -march=native, please show the output of # gcc -Ofast -march=native rx.c -lm -o rx-gcc-Ofast -v