   0  -live- %f0
   0  goto_if_not_float_eq %f0, $0.0, L1
   5  residual_call_irf_f $<* fn copysign>, I[], R[], F[$inf, %f0], <CallDescr(ff) EF=0> -> %f0
  15  float_return %f0
  17  ---
  17  L1:
  17  float_truediv $1.0, %f0 -> %f0
  21  float_return %f0
