On 2017.12.17 at 12:26 +0100, Jan Hubicka wrote:
> > Since Nehalem the 64bit multiplication latency is three cycles, not
> > four. So update the costs to reflect reality.
>
> I looked into the imul latencies and was a bit confused, decided to look
> into it later and forgot.
>
> Agner Fog's
> Since Nehalem the 64bit multiplication latency is three cycles, not
> four. So update the costs to reflect reality.
I looked into the imul latencies and was a bit confused, decided to look
into it later and forgot.
Agner Fog's table http://www.agner.org/optimize/instruction_tables.pdf
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