mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 22:30:12 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* Round to int floating-point values. RISC-V version.
|
|
Copyright (C) 2017-2019 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <math.h>
|
|
#include <fenv_private.h>
|
|
#include <libm-alias-float.h>
|
|
#include <stdint.h>
|
|
|
|
float
|
|
__nearbyintf (float x)
|
|
{
|
|
int flags = riscv_getflags ();
|
|
bool nan = isnan (x);
|
|
float mag = fabsf (x);
|
|
|
|
if (nan)
|
|
return x + x;
|
|
|
|
if (mag < (1 << __FLT_MANT_DIG__))
|
|
{
|
|
int32_t i;
|
|
float new_x;
|
|
|
|
asm volatile ("fcvt.w.s %0, %1" : "=r" (i) : "f" (x));
|
|
asm volatile ("fcvt.s.w %0, %1" : "=f" (new_x) : "r" (i));
|
|
|
|
/* nearbyint(-0) == -0, and in general we'll always have the same
|
|
sign as our input. */
|
|
x = copysignf (new_x, x);
|
|
|
|
riscv_setflags (flags);
|
|
}
|
|
|
|
return x;
|
|
}
|
|
|
|
libm_alias_float (__nearbyint, nearbyint)
|