Re: Calling conventions (particularly 32-bit ARM)

scott@slp53.sl.home (Scott Lurndal) writes:

Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

scott@slp53.sl.home (Scott Lurndal) writes:

Thomas Koenig <tkoenig@netcologne.de> writes:

[...]

What I was criticising was the comittee(s) which made errno handling
for functions like sin() and cos() mandatory, and put activating
it in a globel flag.

>
It's not mandatory.   It's listed as an optional extension, and
even when implemented, it's opt-in at compile time.
>
  "The functionality described is optional. The functionality
   described is mandated by the ISO C standard only for implementations
   that define __STDC_IEC_559__."

>
I can't find that anywhere in ISO C or POSIX.  What exactly are you
quoting?  ISO C doesn't tie math_errhandling to __STDC_IEC_559__.

>
https://pubs.opengroup.org/onlinepubs/9799919799/help/codes.html#MX

OK, but that covers IEC 559 functionality (IEEE floating-point).
The setting (or not) of errno by transcendental functions is
separate from that, and implementations use math_errhandling to
indicate what they do.

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */