mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
5c68d40169
2006-03-07 Jakub Jelinek <jakub@redhat.com> [BZ #2423] * math/libm-test.inc [TEST_LDOUBLE] (ceil_test, floor_test, rint_test, round_test, trunc_test): Only run some of the new tests if LDBL_MANT_DIG > 100. 2006-03-03 Steven Munroe <sjmunroe@us.ibm.com> Alan Modra <amodra@bigpond.net.au> * sysdeps/powerpc/fpu/fenv_libc.h (__fegetround, __fesetround): Define inline implementations. * sysdeps/powerpc/fpu/fegetround.c: Use __fegetround. * sysdeps/powerpc/fpu/fesetround.c: Use __fesetround. * sysdeps/powerpc/fpu/math_ldbl.h: New file. [BZ #2423] * math/libm-test.inc [TEST_LDOUBLE] (ceil_test, floor_test, rint_test, round_test, trunc_test): Add new tests. * sysdeps/ieee754/ldbl-128ibm/math_ldbl.h (EXTRACT_IBM_EXTENDED_MANTISSA, INSERT_IBM_EXTENDED_MANTISSA): Removed, replaced with ... (ldbl_extract_mantissa, ldbl_insert_mantissa, ldbl_pack, ldbl_unpack, ldbl_canonicalise, ldbl_nearbyint): New functions. * sysdeps/ieee754/ldbl-128ibm/e_fmodl.c (__ieee754_fmodl): Replace EXTRACT_IBM_EXTENDED_MANTISSA and INSERT_IBM_EXTENDED_MANTISSA with ldbl_extract_mantissa and ldbl_insert_mantissa. * sysdeps/ieee754/ldbl-128ibm/e_rem_pio2l.c (__ieee754_rem_pio2l): Replace EXTRACT_IBM_EXTENDED_MANTISSA with ldbl_extract_mantissa. (ldbl_extract_mantissa, ldbl_insert_mantissa): New inline functions. * sysdeps/ieee754/ldbl-128ibm/s_ceill.c (__ceill): Handle rounding that spans doubles in IBM long double format. * sysdeps/ieee754/ldbl-128ibm/s_floorl.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/s_rintl.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/s_roundl.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/s_truncl.c: Likewise. * sysdeps/powerpc/powerpc64/fpu/s_rintl.S: File removed.
120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/* Round to int long double floating-point values.
|
|
IBM extended format long double version.
|
|
Copyright (C) 2006 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
/* This has been coded in assembler because GCC makes such a mess of it
|
|
when it's coded in C. */
|
|
|
|
#include <math.h>
|
|
#include <fenv_libc.h>
|
|
#include <math_ldbl_opt.h>
|
|
#include <float.h>
|
|
#include <ieee754.h>
|
|
|
|
|
|
#ifdef __STDC__
|
|
long double
|
|
__rintl (long double x)
|
|
#else
|
|
long double
|
|
__rintl (x)
|
|
long double x;
|
|
#endif
|
|
{
|
|
double xh, xl, hi, lo;
|
|
|
|
ldbl_unpack (x, &xh, &xl);
|
|
|
|
/* Return Inf, Nan, +/-0 unchanged. */
|
|
if (__builtin_expect (xh != 0.0
|
|
&& __builtin_isless (__builtin_fabs (xh),
|
|
__builtin_inf ()), 1))
|
|
{
|
|
double orig_xh;
|
|
int save_round = fegetround ();
|
|
|
|
/* Long double arithmetic, including the canonicalisation below,
|
|
only works in round-to-nearest mode. */
|
|
fesetround (FE_TONEAREST);
|
|
|
|
/* Convert the high double to integer. */
|
|
orig_xh = xh;
|
|
hi = ldbl_nearbyint (xh);
|
|
|
|
/* Subtract integral high part from the value. If the low double
|
|
happens to be exactly 0.5 or -0.5, you might think that this
|
|
subtraction could result in an incorrect conversion. For
|
|
instance, subtracting an odd number would cause this function
|
|
to round in the wrong direction. However, if we have a
|
|
canonical long double with the low double 0.5 or -0.5, then the
|
|
high double must be even. */
|
|
xh -= hi;
|
|
ldbl_canonicalize (&xh, &xl);
|
|
|
|
/* Now convert the low double, adjusted for any remainder from the
|
|
high double. */
|
|
lo = ldbl_nearbyint (xh);
|
|
|
|
xh -= lo;
|
|
ldbl_canonicalize (&xh, &xl);
|
|
|
|
switch (save_round)
|
|
{
|
|
case FE_TONEAREST:
|
|
if (xl > 0.0 && xh == 0.5)
|
|
lo += 1.0;
|
|
else if (xl < 0.0 && -xh == 0.5)
|
|
lo -= 1.0;
|
|
break;
|
|
|
|
case FE_TOWARDZERO:
|
|
if (orig_xh < 0.0)
|
|
goto do_up;
|
|
/* Fall thru */
|
|
|
|
case FE_DOWNWARD:
|
|
if (xh < 0.0 || (xh == 0.0 && xl < 0.0))
|
|
lo -= 1.0;
|
|
break;
|
|
|
|
case FE_UPWARD:
|
|
do_up:
|
|
if (xh > 0.0 || (xh == 0.0 && xl > 0.0))
|
|
lo += 1.0;
|
|
break;
|
|
}
|
|
|
|
/* Ensure the final value is canonical. In certain cases,
|
|
rounding causes hi,lo calculated so far to be non-canonical. */
|
|
xh = hi;
|
|
xl = lo;
|
|
ldbl_canonicalize (&xh, &xl);
|
|
|
|
/* Ensure we return -0 rather than +0 when appropriate. */
|
|
if (orig_xh < 0.0)
|
|
xh = -__builtin_fabs (xh);
|
|
|
|
fesetround (save_round);
|
|
}
|
|
|
|
return ldbl_pack (xh, xl);
|
|
}
|
|
|
|
long_double_symbol (libm, __rintl, rintl);
|