glibc/sysdeps/ieee754/flt-32/s_lrintf.c
Ulrich Drepper 6624dbc07b [BZ #2592]
2006-06-17  Joseph S. Myers  <joseph@codesourcery.com>
	[BZ #2592]
	* math/libm-test.inc (lrint_test_tonearest): New function.
	(lrint_test_towardzero): New function.
	(lrint_test_downward): New function.
	(lrint_test_upward): New function.
	(main): Run these new tests.
	* sysdeps/ieee754/dbl-64/s_llrint.c (__llrint): Correct rounding
	of values near to 0.
	(two52): Use double not long double.
	* sysdeps/ieee754/dbl-64/s_lrint.c (__lrint): Likewise.
	* sysdeps/ieee754/flt-32/s_llrintf.c (__llrintf): Likewise.
	(two23): Use float not double.
	* sysdeps/ieee754/flt-32/s_lrintf.c (__lrintf): Likewise.
	(two23): Use float not double.
	* sysdeps/ieee754/ldbl-128/s_llrintl.c (__llrintl): Likewise.
	* sysdeps/ieee754/ldbl-128/s_lrintl.c (__lrintl): Likewise.
	* sysdeps/ieee754/ldbl-96/s_llrintl.c (__llrintl): Likewise.
	* sysdeps/ieee754/ldbl-96/s_lrintl.c (__lrintl): Likewise.
2006-09-20 17:29:36 +00:00

77 lines
1.9 KiB
C

/* Round argument to nearest integral value according to current rounding
direction.
Copyright (C) 1997, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <math.h>
#include "math_private.h"
static const float two23[2] =
{
8.3886080000e+06, /* 0x4B000000 */
-8.3886080000e+06, /* 0xCB000000 */
};
long int
__lrintf (float x)
{
int32_t j0;
u_int32_t i0;
volatile float w;
float t;
long int result;
int sx;
GET_FLOAT_WORD (i0, x);
sx = i0 >> 31;
j0 = ((i0 >> 23) & 0xff) - 0x7f;
i0 &= 0x7fffff;
i0 |= 0x800000;
if (j0 < (int32_t) (sizeof (long int) * 8) - 1)
{
if (j0 >= 23)
result = (long int) i0 << (j0 - 23);
else
{
w = two23[sx] + x;
t = w - two23[sx];
GET_FLOAT_WORD (i0, t);
j0 = ((i0 >> 23) & 0xff) - 0x7f;
i0 &= 0x7fffff;
i0 |= 0x800000;
result = (j0 < 0 ? 0 : i0 >> (23 - j0));
}
}
else
{
/* The number is too large. It is left implementation defined
what happens. */
return (long int) x;
}
return sx ? -result : result;
}
weak_alias (__lrintf, lrintf)