https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79593
Uroš Bizjak <ubizjak at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rguenth at gcc dot gnu.org --- Comment #8 from Uroš Bizjak <ubizjak at gmail dot com> --- The remaining fld %st(0) is there due to multiple uses of global_data+0, once in XFmode and once in SFmode. But this is what tree optimizers give us: long double min; long double delta; float _2; <bb 3> [54.00%]: _2 = global_data[0]; delta_13 = (long double) _2; _3 = global_data[1]; min_14 = (long double) _3; pretmp_28 = *e_11(D).D.2291.f; if (_2 < 0.0) goto <bb 4>; [36.00%] else goto <bb 5>; [64.00%] Please note the comparison (_2 < 0.0). I don't know why, looking at the source, delta_13 should be used there. Let's ask tree experts.