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Re: [Patch, Fortran] PR 57160: short-circuit IF only with -ffrontend-optimize

On Tue, Jul 24, 2018 at 4:46 PM, Janus Weil <> wrote:

> 2018-07-24 11:12 GMT+02:00 Dominique d'Humières <>:
> > If you want non short-circuit evaluation, introduce an option for it.
> Your argument could easily be reversed: If you want short-circuiting,
> go introduce an option for it.
> I'm sure we'll not get anywhere this way, and I do think that Joost's
> suggestion to avoid short-circuiting with -O0 (and possibly -Og) is
> very reasonable: People who want maximum performance still get that
> with -O3, and at the same time they can still check their codes for
> errors with -O0.

I agree with Dominique, that this would be better as a separate option.
Optimization bugs that pop up at different optimization levels are hard
enough for users to figure out, without the frontend generating different
code to begin with depending on the optimization level. Also, with a
separate option it would be easy to check how it affects performance at
different optimization levels.

What about making it a -fcheck=short-circuit-logicals (or however you want
to spell it?) option, that also would be enabled with -fcheck=all?

Janne Blomqvist

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