[Haskell-cafe] Are newtypes optimised and how much?
wren ng thornton
wren at freegeek.org
Wed Oct 20 19:07:25 EDT 2010
On 10/20/10 7:09 AM, Simon Peyton-Jones wrote:
> Yes, you can freely use Foo/unFoo. There's no runtime penalty. (In the jargon of GHC's intermediate language, Foo and unFoo translate to *type-safe casts*, which generate no executable code.
When does the conversion to type-safe casts occur relative to other
optimizations (namely, rewrite rules)?
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