Re: [Haskell-cafe] Haskell version of ray tracer code is much slower than the original ML

On Thu, Jun 21, 2007 at 01:29:56PM -0400, Mark T.B. Carroll wrote:

Philip Armstrong writes: (snip)

...

Because the optimisation page on the haskell wiki is very explicit about never using Float when you can use Double, that's why. (snip)

Is that still true if you use -fexcess-precision ?

Why on earth would you use -fexcess-precision if you're using Floats? The excess precision only apples to Doubles held in registers on x86 IIRC. (If you spill a Double from a register to memory, then you lose the extra precision bits in the process). Unless -fexcess-precision with ghc does something completely different to the analogous gcc setting that is. Phil -- http://www.kantaka.co.uk/ .oOo. public key: http://www.kantaka.co.uk/gpg.txt