https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95169
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
0x000011e6 <+45>: fcompl -0x10(%ebp)
0x000011e9 <+48>: fnstsw %ax
0x000011eb <+50>: sahf
That is what raises the invalid-operation exception
#(insn 23 56 24 2 (set (reg:HI 0 ax [99])
# (unspec:HI [
# (compare:CCFP (reg:DF 8 st)
# (mem/c:DF (plus:SI (reg/f:SI 6 bp)
# (const_int -16 [0xfffffffffffffff0])) [1 y+0 S8
A64]))
# ] UNSPEC_FNSTSW)) "t6.c":6:25 23 {*cmpdf_i387}
# (expr_list:REG_DEAD (reg:DF 8 st)
# (nil)))
fcompl -16(%ebp) # 23 [c=20 l=16] *cmpdf_i387
