[Bug middle-end/91512] [10 Regression] Fortran compile time regression.

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91512

--- Comment #27 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 21 Apr 2020, tkoenig at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91512
> 
> --- Comment #26 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
> (In reply to Bill Seurer from comment #25)
> > This is affecting us on powerpc64 as well.  It takes twice as long to build
> > the spec2017 test cases with most of the difference in a few of the fortran
> > compilations which take 30 times or more longer.  I tried the new option but
> > it seems to have no effect.
> > 
> > Some quick comparison timings:
> > 
> > compiling module_first_rk_step_part1.fppized.f90 (part of 521.wrf_r)
> > 
> > r10-484: 0m17, 0m14
> > r10-485: 9m19, 9m17
> > r10-7837 (current-ish trunk): 9m57, 10m3
> > r10-7837 with -finline-arg-packing: 9m58, 9m59
> > 
> > Compiling all of spec2017
> > 
> > r10-484: 34m8 
> > r10-485: 65m1  
> > r10-7837: 63m47  
> > r10-7837 w. option: 65m36
> 
> Does the option actually work, i.e. does it have the desired effect
> of not expanding the packing inline?  Maybe you could do a quick check
> of the tree dumps generated.

I think you need -fno-inline-arg-packing