On Wednesday, March 07, 2012 17:29:24 Simen Kjærås wrote: > On Wed, 07 Mar 2012 01:41:22 +0100, Jonathan M Davis <jmdavisp...@gmx.com> > > wrote: > > It really takes very little for something to be impure, and optimizations > > often do it, because they end up using low-level constructs which aren't > > pure > > - some of which could be but aren't and others which probably can't be. > > Just so this is clear - no optimization of the compiler is going to change > the purity of a function. An optimization on the part of the programmer > (like using appender) might, though.
I didn't say that it did, though maybe I wasn't clear enough. Optimizations of the _algorithms_ involved can make a function impure - such as use Appender instead of ~= when building arrays. - Jonathan M Davis