Richard A. O'Keefe wrote:
On 14 May 2008, at 8:58 am, Andrew Coppin wrote:
What I'm trying to say [and saying very badly] is that Haskell is an
almost terrifyingly subtle language.
Name me a useful programming language that isn't.
Simply interchanging two for-loops, from
for (i = 0; i < N; i++) for (j = 0; j < N; j++)
to for (j = 0; j < N; j++) for (i = 0; i < N; i++)
when marching over an array, can easily slow you down
by nearly two orders of magnitude in C.
[Hint: read "What every computer scientist needs to know
about memory".]
OK, well *that* is news... :-o
I would suggest that for heap-allocated data that isn't an array, both
cases will be equally unperformant. I can't prove that though...
"Unexpectedly slow" is better than "inexplicably buggy".
+184 o_O
_______________________________________________
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-cafe
