On Saturday, 11 April 2015 at 12:04:06 UTC, matovitch wrote:
well ldc doesn't compile :
kmeans.d(40): Error: no property 'enumerate' for type 'Range'
With -O -release -inline I get around 2s with foreach and 0.5s
with a simple for.
LDC does not yet support the 2.067 front-end version in which
`enumerate` was made available. You could get the `enumerate`
implementation from the DMD release and it should work with older
FE versions (within reason - it may or may not depend on
relatively new language features).
Performance with range-based code requires a sophisticated
optimizer, the kind that is used to optimize idiomatic C++ code.
In particular, inlining is important as there are a lot of tiny
generic functions involved. Unfortunately, DMD's optimizer is not
up to this task.
