[Bug fortran/79430] [7 Regression] action of statement incorrectly optimised away

[bijan at chokoufe dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79430

--- Comment #37 from Bijan Chokoufe <bijan at chokoufe dot com> ---
(In reply to Thomas Koenig from comment #35)

> [tkoenig@gcc1-power7 shower]$ pwd
> /home/tkoenig/whizard-2.4.1/src/shower
> [tkoenig@gcc1-power7 shower]$ grep -i volatile *.f90
> [tkoenig@gcc1-power7 shower]$ 
> 
> Did you run a diff on the generated assembly with and without
> the VOLATILE statement?  You can use the -save-temps option for that.

I generated the .s files with -save-temps with and without volatile attributes.
The diff is attached. I can say the instructions are different but that's about
it.

Concerning your PowerPC compilation: Have you set FCLAGS yourself and if so
have you included -O2? That other tests are failing is not too suprising and
doesn't have to be a major problem as the test suite is not numerically
waterproof (and partly can't be). The issue with memcpy looks like a bug
though.