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Re: [PATCH] powerpc: Fix logbl on power7 [BZ# 21280]
Adhemerval Zanella <adhemerval.zanella@linaro.org> writes:
> On 20/03/2017 18:02, Tulio Magno Quites Machado Filho wrote:
>> 1. Fix the results for negative subnormals by ignoring the signal when
>> normalizing the value.
>> 2. Fix the output when the high part is a power of 2 and the low part
>> is a nonzero number with opposite sign. This fix is based on commit
>> 380bd0fd2418f8988217de950f8b8ff18af0cb2b.
>
> It is not a blocker, but based on the complexity of the change and the
> optimization real case usage, I wonder if it would be better to just remove
> it and use the default implementation instead.
I tried to do that before fixing these, but the performance difference is
still around 2x.
--
Tulio Magno