https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63534
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- For -pg, at least for 32-bit -fpic, one way to handle this would be for !targetm.profile_before_prologue () && crtl->profile in ix86_init_pic_reg instead of emitting set_got into the pic_offset_table_rtx emit set_got into %ebx hard reg and then copy %ebx to the pic_offset_table_rtx (to strongly hint RA that it better should allocate the pic register at the start of the function to %ebx). And then, when emitting prologue, see if the function doesn't start with set_got insn (after optional notes) loading into %ebx, and if it does, move the set_got insn right before the NOTE_INSN_PROLOGUE_END (on which final.c emits the _mcount call). That way, there will be just a single set_got, not two. If you don't find it for some reason (e.g. function that doesn't use PIC register otherwise, or something unexpected happened), make sure you treat %ebx as clobbered in the prologue and emit the set_got into %ebx directly right before NOTE_INSN_PROLOGUE_END. For -m64 -fpic -mcmodel=large -pg this will be harder, as init_pic_reg emits multiple instructions.
