[Haskell-beginners] Double vs. Num

[Tim Perry]

I imagine that in this program when Double isn't specified the compiler
doesn't assign a "hardware optimized" number type. Consequently it isn't
using the specialized functions that are used for 64-bit floating point
numbers. When the program specifies it is receiving the "Double" values,
then it does use the "hardware optimized" data types.

On Wed, May 4, 2016 at 3:12 PM, Ben Rogalski <bwrogalski at gmail.com> wrote:

> I have found that using the type Double in a type signature causes my
> program to run much faster than if I use a type variable with a Num
> constraint.
>
> Is this common, and if so, why is explicitly using Double faster?
>
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