On Mon, Jan 24, 2022 at 8:50 PM Thiago Macieira <thiago.macie...@intel.com> wrote:
> If you're talking about code in Qt, simply use std::fma and it'll do the > right > thing. It becomes my problem to optimise it so we get the shortest code > emission, not yours. > So as it is now in that case. If it's not my problem but yours, then this works for me wondrously. :) The compilers also convert *some* instances of plain multiplication > followed > by addition into FMA. That depends on compiler flags, often enough, > because of > differences in rounding. > I will check if I'm not talking nonsense (as I had a few iterations over that one), but I can't rely on that to happen magically - so I simply enforce it at this point with std::fma.
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