Re: [isabelle] Word32/64 ?

On Wed, 27 Jan 2010, Rafal Kolanski wrote:

One approach for high-performance code seems to be going in reverse, i.e. parsing annotated SML/C/Haskell/whatever into Isabelle, where you can pick your own translation, but have to pay by having to specify the semantics also.

BTW, "high-performance" in SML (as implemented in Poly/ML) means to use the default int, i.e. the proper mathematical (unbounded) integers, not machine words. Poly/ML optimizes the representation of values for the demands of symbolic computation, not for bare metal operations. So proper ints, lists (cons cells), datatypes are fast, but Word32 is really slow.


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