Re: [qemu-s390x] [Qemu-devel] [PATCH v1 1/5] s390x/tcg: Implement VECTOR FIND ANY ELEMENT EQUAL

[David Hildenbrand]

> I also think that, if we create a bunch more of these wrappers:
> 
>> +DEF_VFAE_HELPER(8)
>> +DEF_VFAE_HELPER(16)
>> +DEF_VFAE_HELPER(32)
> 
> then RT and ZS can be passed in as constant parameters to the above, and then
> the compiler will fold away all of the stuff that's not needed for each
> different case.  Which, I think, is significant.  These are practically
> different instructions with the different modifiers.
> 

So, we have 4 flags, resulting in 16 variants. Times 3 element sizes ...
48 helpers in total. Do we really want to go down that path?

I can also go ahead any try to identify the most frequent users (in
Linux) and only specialize that one.

-- 

Thanks,

David / dhildenb