Date: Mon, 5 Sep 2022 10:49:18 +0200 From: ardi <ardillasdelmonte@...il.com> To: musl@...ts.openwall.com Subject: Re: Do you recommend using fmt_fp() and On Sun, Sep 4, 2022 at 11:59 PM Rich Felker <dalias@...c.org> wrote: > > It's not about the exponent size but the mantissa size, and the > numbers 64 and 120 are completely arbitrary except for being larger > than the number of mantissa bits and small enough not to overflow (so > at most a little under twice the max exponent). Thanks a lot, Rich! After having substituted all the C arithmetic expressions and libm functions by calls to the SoftFloat functions for binary128 (and implementing some libm functions not provided by SoftFloat), I got the FP->String and the String->FP conversion working, with a 100% software implementation of binary128!! I tested the round-trip FP->String->FP for a few cases (PI, -PI, 1/3 and -1/3), using precision 36 (DECIMAL_DIG for binary128), and the round-trip is successful for binary128!! (yes, I used full-128bit PI from here: https://www.chusov.org/fp_constants.html ) Of course I need to test this with more numbers, and with a loop of a zillion random numbers, but for the moment I'm _very_ happy. I need to tidy it up a bit, and I'd like to implement more libm functions (ideally I'd wish to provide the full libm catalog). When it's ready, I'll publish the source in github or similar. Thanks a lot!! César
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