[PATCH v1] powerpc64le: Revert "Optimized strcmp for power10"

[Carlos O'Donell]

On 6/11/25 9:16 AM, Carlos O'Donell wrote:
> On 6/10/25 10:22 AM, Siddhesh Poyarekar wrote:
>> On 2025-06-06 13:45, Sachin Monga wrote:
>>> This reverts commit 3367d8e180848030d1646f088759f02b8dfe0d6f.
>>>
>>> Reason for revert: Power 10 strcmp clobbers nonvolatile
>>> vector registers (bug 33056).
>>>
>>> Signed-off-by: Sachin Monga <smonga@linux.ibm.com>
>>
>> Thanks, please also backport this to 2.40 and 2.39.
>>
>> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
> 
> This is incomplete, and I'd like to see this done in reverse order
> that they were applied to the branch since it makes it easier to
> audit and work it out. A series with all 3 reverted, or the strncmp
> revert first, then the memchr, then the strcmp. Then we can work them
> forwards in any order.
> 
> Suggested order:
> Revert strncmp 23f0d81608d0ca6379894ef81670cf30af7fd081 (May 2024)
> Revert memchr b9182c793caa05df5d697427c0538936e6396d4b (Dec 2023)
> Revert strcmp 3367d8e180848030d1646f088759f02b8dfe0d6f (Dec 2024)
> 

With dates corrected:

Revert strncmp 23f0d81608d0ca6379894ef81670cf30af7fd081 (May 2024)
Revert memchr b9182c793caa05df5d697427c0538936e6396d4b (Dec 12 2023)
Revert strcmp 3367d8e180848030d1646f088759f02b8dfe0d6f (Dec 6 2023)

-- 
Cheers,
Carlos.