[PATCH 1/4] libstdc++: More efficient date from days.

[Jonathan Wakely]

On 25/02/21 14:19 +0000, Jonathan Wakely wrote:
>On 25/02/21 14:02 +0000, Jonathan Wakely wrote:
>>On 25/02/21 13:46 +0000, Cassio Neri via Libstdc++ wrote:
>>>Hi Jonathan,
>>>
>>>The issue is that I didn't cast __dp.count() to uint32_t:
>>>
>>>-      const auto __r0 = __dp.count() + __r2_e3;
>>>+      const auto __r0 = static_cast<uint32_t>(__dp.count()) + __r2_e3;
>>>
>>>The above would be a better fix. Indeed, __r0 belongs to [0, 2^32[ which allows
>>>all arithmetics that follow to be performed on uint32_t values. For performance
>>>this is better than using signed integers.
>>
>>OK, I'll make that change shortly, thanks.
>
>We still need to cast to int for the return value though, because
>converting from uint32_t to int is still narrowing.

I've committed this now.

Tested powerpc64le-linux, committed to trunk.


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