glibc/math/w_scalbf_compat.c
Paul Eggert 581c785bf3 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 7061 files FOO.

I then removed trailing white space from math/tgmath.h,
support/tst-support-open-dev-null-range.c, and
sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following
obscure pre-commit check failure diagnostics from Savannah.  I don't
know why I run into these diagnostics whereas others evidently do not.

remote: *** 912-#endif
remote: *** 913:
remote: *** 914-
remote: *** error: lines with trailing whitespace found
...
remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
2022-01-01 11:40:24 -08:00

79 lines
1.9 KiB
C

/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <math.h>
#include <math_private.h>
#include <math-svid-compat.h>
#if LIBM_SVID_COMPAT
static float
__attribute__ ((noinline))
sysv_scalbf (float x, float fn)
{
float z = __ieee754_scalbf (x, fn);
if (__glibc_unlikely (isinf (z)))
{
if (isfinite (x))
return __kernel_standard_f (x, fn, 132); /* scalb overflow */
else
__set_errno (ERANGE);
}
else if (__builtin_expect (z == 0.0f, 0) && z != x)
return __kernel_standard_f (x, fn, 133); /* scalb underflow */
return z;
}
/* Wrapper scalbf */
float
__scalbf (float x, float fn)
{
if (__glibc_unlikely (_LIB_VERSION == _SVID_))
return sysv_scalbf (x, fn);
else
{
float z = __ieee754_scalbf (x, fn);
if (__glibc_unlikely (!isfinite (z) || z == 0.0f))
{
if (isnan (z))
{
if (!isnan (x) && !isnan (fn))
__set_errno (EDOM);
}
else if (isinf (z))
{
if (!isinf (x) && !isinf (fn))
__set_errno (ERANGE);
}
else
{
/* z == 0. */
if (x != 0.0f && !isinf (fn))
__set_errno (ERANGE);
}
}
return z;
}
}
weak_alias (__scalbf, scalbf)
#endif