Am 08.11.16 um 02:23 schrieb Steve D'Aprano:
But as far as I know, they [NVidia] 're not the only manufacturer of GPUs, and
they
are the only ones who support IEEE 754. So this is *exactly* the situation
I feared: incompatible GPUs with varying support for IEEE 754 making it
difficult or impossible to write correct numeric code across GPU platforms.
I don't agree. Exact IEEE 754 conforming rounding could guarantee that
you get bit-identical results. However, if the results of your
computation depends on the exact rounding rules, i.e. differs by more
than a minor value, then your algorithm is numerically unstable and you
there is no way to decide which of both results is correct - most
probably both are wrong.
Christian
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