[Bug libfortran/93871] COTAN is slow for complex types

[sgk at troutmask dot apl.washington.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93871

--- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Fri, Feb 21, 2020 at 06:53:18PM +0000, kargl at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93871
> 
> --- Comment #3 from kargl at gcc dot gnu.org ---
> (In reply to kargl from comment #2)
> > Can you post the code you used for testing?  Your patch to simplify.c
> > affects compile-time constant folding.  simplify.c has nothing to do
> > with a run-time evaluation.
> > 
> 
> Nevermind, I didn't realize that this required -fdec.  It would help
> if you added your test program, and command line used for testing!
> 

Adding -fdec and -fdump-tree-original, see

  c = __builtin_ccosf (b) / __builtin_csinf (b);

which comes from iresolve.c.