On Friday, 28 December 2018 at 19:48:28 UTC, 9il wrote:
LDC, macos x64:
---------------------------
++++ float ++++
ldexp (Phobos time / Mir time) = 2.55584
ldexp ( stdc time / Mir time) = 0.773019
frexp (Phobos time / Mir time) = 1.04093
frexp ( stdc time / Mir time) = 1.748
---------------------------
++++ double ++++
ldexp (Phobos time / Mir time) = 2.49162
ldexp ( stdc time / Mir time) = 1.31868
frexp (Phobos time / Mir time) = 0.937906
frexp ( stdc time / Mir time) = 1.82241
---------------------------
++++ real ++++
ldexp (Phobos time / Mir time) = 0.999327 (LDC Phobos uses C
func for real)
ldexp ( stdc time / Mir time) = 0.969467 (LDC Mir uses C func
for real)
frexp (Phobos time / Mir time) = 1.02512
frexp ( stdc time / Mir time) = 1.77901
Any chance the multi-precision ldexp can be upstreamed to Phobos
(which currently uses real precision for the float/double
overloads, which explains the suboptimal performance)? It'd make
a *lot* more sense there, instead of having it in a separate
library. It's well-known that there's a lot of remaining std.math
functions which need proper single/double precision
implementations, and ldexp is one of them.
