[PATCH] Use flag_general_regs_only with -mgeneral-regs-only

[Uros Bizjak]

On Tue, May 24, 2016 at 5:40 PM, H.J. Lu <hjl.tools@gmail.com> wrote:

>> No, this is a flag, not a variable. Let's figure out how to extend
>> target flags to more than 63 flags first.
>
> Extending target flags to more than 63 bits requires replacing
> HOST_WIDE_INT with a bit vector.  Since target flags is used in
> TARGET_SUBTARGET_DEFAULT, change it to a bit vector is a
> non-trivial change.  On the other hand, -mgeneral-regs-only is a
> command-line option which doesn't require support for
> TARGET_SUBTARGET_DEFAULT, similar to other -m options like
> -mmitigate-rop.  Using flag_general_regs_only is an option.

I have been informed that Intel people are looking into how to extend
target flags to accommodate additional ISA flags. There is no point to
hurry with an unoptimal solution. Perhaps you can coordinate your
patch with their efforts?

Uros.