Re: [PATCH] s390: Change SET rtx_cost handling.

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

On 2/25/22 12:38, Robin Dapp wrote:
> Hi,
> 
> the IF_THEN_ELSE detection currently prevents us from properly costing
> register-register moves which causes the lower-subreg pass to assume
> that a VR-VR move is as expensive as two GPR-GPR moves.
> 
> This patch adds handling for SETs containing REGs as well as MEMs and is
> inspired by the aarch64 implementation.
> 
> Bootstrapped and regtested on z900 up to z15. Is it OK?
> 
> Regards
>  Robin
> 
> --
> 
> gcc/ChangeLog:
> 
> 	* config/s390/s390.cc (s390_address_cost): Declare.
>        	(s390_hard_regno_nregs): Declare.
>        	(s390_rtx_costs): Add handling for REG and MEM in SET.
> 
> gcc/testsuite/ChangeLog:
> 
>        	* gcc.target/s390/vector/vec-sum-across-no-lower-subreg-1.c: New
> test.

Ok. Thanks

Andreas