On Thu, Feb 06, 2020 at 11:01:56AM +0000, Dave Love wrote:
> Jakub Jelinek <[email protected]> writes:
>
> > On Wed, Feb 05, 2020 at 05:13:27PM +0000, Dave Love wrote:
> >> GCC doesn't document the targets for which -fno-common produces better
> >> code. Can someone say for which of the Fedora ones it makes a
> >> difference?
> >
> > E.g. on any that is capable of vectorization.
>
> Thanks. I'll pass that on to the maintainer of the (x86_64-specific)
> performance library, though I guess he'll fix it anyhow.
Note, if for whatever reason one wants the common behavior e.g. on a few
selected variables, one can add __attribute__((__common__)) to those
variables to override the default, it doesn't have to be just -fcommon
that changes the behavior of all non-automatic variables without
initializers.
Jakub
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