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Re: [PATCH, S390] Avoid LA with base and index on z13
On 07/16/2018 01:02 PM, Robin Dapp wrote:
>> But on zEC12 LA works pretty much the same as on z13/z14, it is
>> indeed not cracked, but still a 2-cycle instruction when using
>> an index register. So I guess the change really should apply
>> to zEC12 as well, and this could be as simple as changing the
>> above line to:
>> if (addr.indx && s390_tune >= PROCESSOR_2817_Z196)
>> (Note that "addr.base && addr.indx" is the same as just checking
>> for addr.indx, since s390_decompose_address will never fill in
>> *just* an index.)
> Good point, I adapted the patch and changed the comment.
> 2018-07-16 Robin Dapp <firstname.lastname@example.org>
> * config/s390/s390.c (preferred_la_operand_p): Do not use
> LA with index register on z196 or later.
Ok to apply. Thanks!