[gambit-list] SRFI-56(Re: Reading binary files)

Siegfried Gonzi siegfried.gonzi at gmx.at
Thu Dec 20 12:10:04 EST 2007


Hello:

Thank for all the reply related to reading binary data. I apprehend each help. However, I am still figuring out some stuff. I posted the following also on the Chicken list because now as year long Bigloo user been somehow confused:

==
Hello:

I am still evaluating the case with reading binary data files. However, I do not understand the following srfi-56 comment:

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The reference implementation has been tested with the following Schemes: Bigloo, Chez, Chicken, Gambit, Gauche, Guile, Kawa, KSI, MIT-Scheme, MzScheme, RScheme, Scheme48, SISC and Stklos. The *-float64 code turns out to be a very rigorous stress test for an implementation's numeric code. At time of writing, Chicken 2.0 (with the optional numbers egg), KSI 3.4.2 and MzScheme (both 200 and 299 versions) are currently the only implementations to pass all tests. Petite Chez 6.0a is the next most complete failing 6, followed by Gambit4b14 failing 8. Any Scheme that implements floating point numbers internally as C floats rather than doubles will be fundamentally unable to pass all *-float64 tests.
==


Does that mean Bigloo implements numbers as C float type rather than double precision? Same for Gambit-C?

Chicken implements numbers as double precision?

I always thought there are two types for most of the 'modern languages' (e.g. Clean which I first learnt and  Scheme compilers): long integer, and double precision C type?


Anyone any experience with srfi-56 on Gambit. I think it never went through the peer review process and has been withdrawn. But anyway.

Thanks, Siegfried
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