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Date: Tue, 3 Oct 2023 17:22:30 +0700
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To: Saki Takamachi <saki@sakiot.com>
Cc: Jorg Sowa <jorg.sowa@gmail.com>, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="0000000000005795c40606cd4583"
Subject: Re: [PHP-DEV] [RFC] [Discussion] Adding bcround, bcfloor and bcceil
 to BCMath
From: pierre.php@gmail.com (Pierre Joye)

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On Tue, Oct 3, 2023, 4:13 PM Saki Takamachi <saki@sakiot.com> wrote:

> yes, they do, as do almost all floating points implementation.
>
> Memory limited float values and their respective operations are still
> useful in many areas, but financial values and the likes. Scaled integers
> are the way for accuracy.
>
>
> Also, side note, gmp recommends to rely on https://www.mpfr.org/ for
> accurate FP operations
>
>
> Hi
>
> This seems to be a floating point number with extremely high precision
> compared to regular long doubles. However, as you say, even though the
> accuracy is very high, errors still occur. (the error is so small that it
> almost never becomes a problem.)
>
> By its very nature, BCMath does not introduce any errors. It is debatable
> whether floating point calculations in GMP can play the role of BCMath.
>

so does gmp. The point made about gmp earlier is more about the
sustainability of gmp vs bcmath.

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