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From: Thomas Koenig <tkoenig@netcologne.de>
Newsgroups: comp.arch
Subject: Re: What integer C type to use
Date: Wed, 13 Mar 2024 06:17:01 -0000 (UTC)
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Michael S <already5chosen@yahoo.com> schrieb:

> Even for Cray/NEC-style vectors, the same throughput for different
> precision is not an universal property. Cray's and NEC's vector
> processors happen to be designed like that, but one can easily imagine
> vector processors of similar style that have 2 or even 3 times higher
> throughput for SP vs DP.
> I personally never encountered such machines, but would be surprised if
> it were never built and sold back by one or another usual suspect (may
> be, Fujitsu?) in days when designers liked Cray's style.

I worked on such a machine, and (IIRC) single precision was faster
on that machine.  That may have been due to the comparatively
low memory throughput of the single load/store pipeline that it had.

But it's been a few decades, and my memory may be off (and I don't
have any handbooks from the time).