On Thursday, 4 August 2016 at 18:53:23 UTC, Walter Bright wrote:
On 8/4/2016 7:08 AM, Andrew Godfrey wrote:
Now, my major experience is in the context of Intel non-SIMD
FP, where internal
precision is 80-bit. I can see the appeal of asking for the
ability to reduce
internal precision to match the data type you're using, and I
think I've read
something written by Walter on that topic. But this would
hardly be "C-like" FP
support so I'm not sure that's he topic at hand.
Also, carefully reading the C Standard, D's behavior is allowed
by the C Standard. The idea that C requires rounding of all
intermediate values to the target precision is incorrect, and
is not "C-like". C floating point semantics can and do vary
from platform to platform, and vary based on optimization
settings, and this is all allowed by the C Standard.
It is actually very common for C compiler to work with double for
intermediate values, which isn't far from what D does.
