Support unaligned load/store on more ARM targets

[Renato Golin]

Hi JF,

Looks good to me. Maybe adding a command line option to change that would
be good, too, but not necessarily in this patch.

Cheers,
Renato
On 15 May 2013 03:31, "JF Bastien" <jfb at google.com> wrote:

> This patch matches GCC behavior: the code used to only allow unaligned
> load/store on ARM for v6+ Darwin, it will now allow unaligned load/store
> for v6+ Darwin as well as for v7+ on other targets.
>
> The distinction is made because v6 doesn't guarantee support (but LLVM
> assumes that Apple controls hardware+kernel and therefore have conformant
> v6 CPUs), whereas v7 does provide this guarantee (and Linux behaves sanely).
>
> I originally encountered this discrepancy in FastIsel tests which expect
> unaligned load/store generation. Overall this should slightly improve
> performance in most cases because of reduced I$ pressure.
>
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