[Committed] RISC-V: Use riscv_subword_address for atomic_test_and_set

[Patrick O'Neill <patrick@rivosinc.com>]

On 11/1/23 12:00, Jeff Law wrote:
>
>
> On 11/1/23 10:14, Patrick O'Neill wrote:
>> Other subword atomic patterns use riscv_subword_address to calculate
>> the aligned address, shift amount, mask and !mask. atomic_test_and_set
>> was implemented before the common function was added. After this patch
>> all subword atomic patterns use riscv_subword_address.
>>
>> gcc/ChangeLog:
>>
>>     * config/riscv/sync.md:  Use riscv_subword_address function to
>>     calculate the address and shift in atomic_test_and_set.
> OK.  No strong opinions on the extraneous move at -O0.  It does make a 
> tiny bit of work for the optimizers, but I doubt it matters in practice.
>
> Your call if you want to fix that as a follow-up or not.
>
> jeff
Committed.

I think I'll leave it as-is since IMO sync.md is more readable when 
those statements are broken up.
If someone finds issue with it in the future we can easily apply the 
diff from the patch.

Thanks,
Patrick