mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 04:31:03 +00:00
c624d23260
This is a preparatory patch to enable building a _Float128
variant to ease reuse when building a _Float128 variant to
alias this long double only symbol.
Notably, stubs are added where missing to the native _Float128
sysdep dir to prevent building these newly templated variants
created inside the build directories.
Also noteworthy are the changes around LIBM_SVID_COMPAT. These
changes are not intuitive. The templated version is only
enabled when !LIBM_SVID_COMPAT, and the compat version is
predicated entirely on LIBM_SVID_COMPAT. Thus, exactly one is
stubbed out entirely when building. The nldbl scalb compat
files are updated to account for this.
Likewise, fixup the reuse of m68k's e_scalb{f,l}.c to include
it's override of e_scalb.c. Otherwise, the search path finds
the templated copy in the build directory. This could be
futher simplified by providing an overridden template, but I
lack the hardware to verify.
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
|
|
|
|
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 double
|
|
__attribute__ ((noinline))
|
|
sysv_scalb (double x, double fn)
|
|
{
|
|
double z = __ieee754_scalb (x, fn);
|
|
|
|
if (__glibc_unlikely (isinf (z)))
|
|
{
|
|
if (isfinite (x))
|
|
return __kernel_standard (x, fn, 32); /* scalb overflow */
|
|
else
|
|
__set_errno (ERANGE);
|
|
}
|
|
else if (__builtin_expect (z == 0.0, 0) && z != x)
|
|
return __kernel_standard (x, fn, 33); /* scalb underflow */
|
|
|
|
return z;
|
|
}
|
|
|
|
|
|
/* Wrapper scalb */
|
|
double
|
|
__scalb (double x, double fn)
|
|
{
|
|
if (__glibc_unlikely (_LIB_VERSION == _SVID_))
|
|
return sysv_scalb (x, fn);
|
|
else
|
|
{
|
|
double z = __ieee754_scalb (x, fn);
|
|
|
|
if (__glibc_unlikely (!isfinite (z) || z == 0.0))
|
|
{
|
|
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 != 0.0 && !isinf (fn))
|
|
__set_errno (ERANGE);
|
|
}
|
|
}
|
|
return z;
|
|
}
|
|
}
|
|
weak_alias (__scalb, scalb)
|
|
# ifdef NO_LONG_DOUBLE
|
|
strong_alias (__scalb, __scalbl)
|
|
weak_alias (__scalb, scalbl)
|
|
# endif
|
|
#endif
|