Date: Wed, 17 Jul 2024 13:01:17 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: enh <enh@google.com> Cc: enh via freebsd-numerics <freebsd-numerics@freebsd.org> Subject: Re: #pragma STDC FENV_ACCESS ON Message-ID: <ZpgjDUvZc90-QfWW@troutmask.apl.washington.edu> In-Reply-To: <CAJgzZoopJT3AJM8cbWzPjheKkcO9bAXXjVauw5g08bb=hgWeHQ@mail.gmail.com> References: <CAJgzZoopJT3AJM8cbWzPjheKkcO9bAXXjVauw5g08bb=hgWeHQ@mail.gmail.com>
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On Wed, Jul 17, 2024 at 01:30:39PM -0400, enh wrote:
> i see lib/msun/src/e_sqrtl.c has `#pragma STDC FENV_ACCESS ON`, but
> s_fma.c, s_fmaf.c, s_fmal.c, and s_nearbyint.c all use fesetround() or
> fesetenv() too --- shouldn't they also have the pragma?
>
> (Android currently builds all of libm with that pragma, but (a) that
> seems like a big hammer and (b) afaict upstream [you] don't, so this
> is potentially causing problems^W^Wallowing the compiler to cause
> problems for you?)
Some of the compilers, which that are used to compile FreeBSD,
do not support "#pragma STDC FENV_ACCESS ON".
#include <stdio.h>
#include <math.h>
#pragma STDC FENV_ACCESS ON
int
main(void)
{
double x = 1, y = 3;
printf ("x _ y = %la\n", x + y);
return 0;
}
% gcc13 -c -Wall a.c
.c:5: warning: ignoring '#pragma STDC FENV_ACCESS' [-Wunknown-pragmas]
5 | #pragma STDC FENV_ACCESS ON
|
--
Steve
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