mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-11 07:40:05 +00:00
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* Copyright (C) 1998-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Richard Henderson.
|
|
|
|
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>
|
|
|
|
/* Use the -inf rounding mode conversion instructions to implement
|
|
ceil, via something akin to -floor(-x). This is much faster than
|
|
playing with the fpcr to achieve +inf rounding mode. */
|
|
|
|
float
|
|
__ceilf (float x)
|
|
{
|
|
if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */
|
|
{
|
|
/* Note that Alpha S_Floating is stored in registers in a
|
|
restricted T_Floating format, so we don't even need to
|
|
convert back to S_Floating in the end. The initial
|
|
conversion to T_Floating is needed to handle denormals. */
|
|
|
|
float tmp1, tmp2, new_x;
|
|
|
|
new_x = -x;
|
|
__asm ("cvtst/s %3,%2\n\t"
|
|
#ifdef _IEEE_FP_INEXACT
|
|
"cvttq/svim %2,%1\n\t"
|
|
#else
|
|
"cvttq/svm %2,%1\n\t"
|
|
#endif
|
|
"cvtqt/m %1,%0\n\t"
|
|
: "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2)
|
|
: "f"(new_x));
|
|
|
|
/* Fix up the negation we did above, as well as handling -0 properly. */
|
|
x = copysignf(new_x, x);
|
|
}
|
|
return x;
|
|
}
|
|
|
|
weak_alias (__ceilf, ceilf)
|