Re: is double slower?

Am 05.11.2024 um 09:14 schrieb David Brown:

You can, as Bonita suggested, look up instruction timing information at agner.org for the cpu you are using (assuming it's an x86 device) to get some idea of any fundamental differences in timings.  Usually for modern "big" processors, basic operations such as addition and multiplication are single cycle or faster (i.e., multiple instructions can be done in parallel) for float and double.  But division, square root, and other more complex operations can take a lot longer with doubles.

Agner.org says that a SQRTS/PD is 21 clock cycles and a SQRTSP/S is 15
clock cycles; that's not much difference.