Re: [PATCH] s390: Use vpdi and verllg in vec_reve.

[Andreas Krebbel <krebbel@linux.ibm.com>]

On 8/12/22 12:13, Robin Dapp wrote:
> Hi,
> 
> swapping the two elements of a V2DImode or V2DFmode vector can be done
> with vpdi instead of using the generic way of loading a permutation mask
> from the literal pool and vperm.
> 
> Analogous to the V2DI/V2DF case reversing the elements of a four-element
> vector can be done by first swapping the elements of the first
> doubleword as well the ones of the second one and subsequently rotate
> the doublewords by 32 bits.
> 
> Bootstrapped and regtested, no regressions.
> 
> Is it OK?
> 
> Regards
>  Robin
> 
> gcc/ChangeLog:
> 
> 	PR target/100869
> 	* config/s390/vector.md (@vpdi4_2<mode>): New pattern.
> 	(rotl<mode>3_di): New pattern.
> 	* config/s390/vx-builtins.md: Use vpdi and verll for reversing
> 	elements.
> 
> gcc/testsuite/ChangeLog:
> 
> 	* gcc.target/s390/zvector/vec-reve-int-long.c: New test.

Ok. Thanks!

Andreas