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[Caml-list] OCaml Speed for Block Convolutions
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Date: 2001-06-04 (20:04)
From: Chris Hecker <checker@d...>
Subject: Re: [Caml-list] OCaml Speed for Block Convolutions

>        let a = ref 0. in
>makes garbage---`a' isn't unboxed---while
>       type floatref = { mutable it: float }

Does this bother anybody else besides me?  Since ref is kind of built-in, is there any way to special case its use on unboxed types and optimize it without making us rewrite lots of code?  There's plenty of other special cased stuff in the compiler, so hey, it's a party!  :)

The other place I get bitten by ref being kind of built-in, kind of not, is in pattern matching:

match a_ref with 
{ contents = 0.0 } -> yuck

Yes, I can match !a, but that's not always convenient (for example, I want a function to take a ref, but name its value:

let f ((x,y) as xy) z = fine
let f ({contents = (x,y)} as xyr) z = a mess

Maybe I'm still too imperative and use ref too much, but I run into this all the time.


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