   0  -live- %f0
   3  goto_if_not_float_eq %f0, $0.0, L1
   8  residual_call_irf_f $<* fn copysign>, I[], R[], F[$inf, %f0], <CallDescr(ff) EF=0> -> %f0
  18  float_return %f0
  20  ---
  20  L1:
  20  float_truediv $1.0, %f0 -> %f0
  24  float_return %f0
