On 11/14/19 2:07 PM, Kyrill Tkachov wrote:
>
> On 11/14/19 10:07 AM, Richard Henderson wrote:
>> The existing definition using register class CC_REG does not
>> work because CC_REGNUM does not support normal modes, and so
>> fails to match register_operand. Use a non-register constraint
>> and the cc_register predicate instead.
>>
>> * config/arm/constraints.md (c): Use cc_register predicate.
>
>
> Ok.
>
> Does this need a backport to the branches?
I don't think so, because it is currently unused.
I tried to track down if it was *ever* used and did not succeed.
The first reference I see is
commit cffb2a26c44c682185b6bb405d48fcbe1fbc0b37
Author: rearnsha <rearnsha@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sat Apr 8 14:29:53 2000 +0000
Merge changes from merged-arm-thumb-backend-branch onto trunk.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@33028 \
138bc75d-0d04-0410-961f-82ee72b054a4
within REG_CLASS_FROM_LETTER. But I cannot find a user of the constraint
within a checkout of that revision.
Unless I miss something, it seems to have been garbage for a very long time.
r~
