[Haskell-cafe] matrix computations based on the GSL
lemming at henning-thielemann.de
Mon Jul 18 08:46:18 EDT 2005
On Mon, 18 Jul 2005, Bulat Ziganshin wrote:
> GHC also have a RULES pragma which can be used to automatically
> convert, for example, "mmap (*)" to "multipleElementWise".
Nice idea! But how can GHC decide which optimization is better?
M.map sin . M.map cos
can be optimized to
M.map (sin . cos)
M.sin . M.cos
Which is better?
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