mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 22:40:05 +00:00
40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/* __ieee754_ilogb(). LoongArch version.
|
|
Copyright (C) 2022-2024 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/>. */
|
|
|
|
#define NO_MATH_REDIRECT
|
|
#include <math.h>
|
|
#include <fpu_control.h>
|
|
|
|
int
|
|
__ieee754_ilogb (double x)
|
|
{
|
|
int x_cond;
|
|
asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
|
|
|
|
if (__glibc_unlikely (x_cond & _FCLASS_ZERO))
|
|
return FP_ILOGB0;
|
|
else if (__glibc_unlikely (x_cond & ( _FCLASS_NAN | _FCLASS_INF)))
|
|
return FP_ILOGBNAN;
|
|
else
|
|
{
|
|
asm volatile ("fabs.d \t%0, %1" : "=f" (x) : "f" (x));
|
|
asm volatile ("flogb.d \t%0, %1" : "=f" (x) : "f" (x));
|
|
return x;
|
|
}
|
|
}
|