Hello!
>> There is already a higher priority for registers not requiring REX.
>> My patch affects cases when compiler has to use xmm8-15 and it just
>> tries to say LRA to assign them for non SSE4 instructions. I doubt it
>> would have some use for other targets than Silvermont.
>
> When it is just a hint, shouldn't there be something like Ya,???x
> or Ya,!x or similar in the SSE4 constraints? I mean, xmm{8-15} can be used,
> just is costly.
Maybe we can use "Ya*x", similar to *pushdf pattern, where it is
costly - but tolerable - to push DFmode value through integer
registers.
Oh, and I didn't notice that Ya name is already taken...
Uros.
