[Cfp-interest 1477] Re: complex multiplication and division
Damian McGuckin
damianm at esi.com.au
Sun Feb 9 03:22:35 PST 2020
I tried your program on a GCC 9.2.1 on Power9, and GCC 4.8.1 and 8.? on
Xeon. I was specifically looking at division because something is very
obviously wrong. You mentioned:
> /* MPC gives (-3.5164330596706266e-225,1.5876733750267203e+173) */
> /* GCC 9.2.1 gives (1.1710898434244477e-223,1.5876733750267203e+173) */
> /* ICC 19.0.4.243: (-3.5164330596706266e-225,1.5876733750267203e+173) */
I get the same answer as MPC. Not your answer. On an ancient Xeon with GCC
4.4.7, I get your 1.171.....e-223 answer. A quick guess is that something
is probably not quite right with your installation of GCC. But I could be
wrong.
Regards - Damian
Pacific Engineering Systems International, 277-279 Broadway, Glebe NSW 2037
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