On Saturday, 7 April 2018 at 20:33:13 UTC, Arun Chandrasekaran
wrote:
Much better with mir.math.common, still a bit slower than C
(even with larger loops):
As this appears to be benchmarking mostly the std.math.exp(float)
performance - some/many basic algos in std.math, incl. exp(), are
currently using the x87 FPU for all 3 floating-point types,
although there are treacherous float/double overloads,
sacrificing performance in many cases.
See
https://github.com/dlang/phobos/pull/6272#issuecomment-373967109
(and the later numbers for current Intel and GCC compilers) for a
performance comparison of some std.math algos incl. exp(). For
LDC, the double/float versions of the few worked-on algos in that
PR were sped-up by an overall factor of 3 [but only by 1.46 for
exp(float)].
