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alpha: Remove round and roundf implementations

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Two bugs in these implementations: First is that the add of 0.5
was not done in chopped rounding mode (easily fixable).  Second
is that the method generates incorrect inexact exceptions for
small integral values (not easily fixable).
This commit is contained in:
Richard Henderson 2014-07-03 08:45:57 -07:00
parent b3ec00e599
commit cd1175a373
3 changed files with 3 additions and 91 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2014-07-03 Richard Henderson <rth@redhat.com>
* sysdeps/alpha/fpu/s_round.c: Remove file.
* sysdeps/alpha/fpu/s_roundf.c: Remove file.
* elf/dl-support.c (HP_TIMING_AVAIL): Do not redefine.
(_dl_non_dynamic_init): Check HP_SMALL_TIMING_AVAIL instead.
* elf/rtld.c (HP_TIMING_AVAIL): Do not redefine.

48
sysdeps/alpha/fpu/s_round.c
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@ -1,48 +0,0 @@
/* Copyright (C) 2007-2014 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 <math_ldbl_opt.h>
double
__round (double x)
{
const double almost_half = 0x1.fffffffffffffp-2;
const double two52 = 0x1.0p52;
double tmp, r;
__asm (
#ifdef _IEEE_FP_INEXACT
"addt/suic %2, %3, %1\n\tsubt/suic %1, %3, %0"
#else
"addt/suc %2, %3, %1\n\tsubt/suc %1, %3, %0"
#endif
: "=&f"(r), "=&f"(tmp)
: "f"(fabs (x) + almost_half), "f"(two52));
return copysign (r, x);
}
weak_alias (__round, round)
#ifdef NO_LONG_DOUBLE
strong_alias (__round, __roundl)
weak_alias (__roundl, roundl)
#endif
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
compat_symbol (libm, __round, roundl, GLIBC_2_1);
#endif

43
sysdeps/alpha/fpu/s_roundf.c
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@ -1,43 +0,0 @@
/* Copyright (C) 2007-2014 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>
float
__roundf (float x)
{
const float almost_half = 0x1.fffffep-2;
const float two23 = 0x1.0p23;
float r, tmp;
__asm (
#ifdef _IEEE_FP_INEXACT
"adds/suic %2, %3, %1\n\tsubs/suic %1, %3, %0"
#else
"adds/suc %2, %3, %1\n\tsubs/suc %1, %3, %0"
#endif
: "=&f"(r), "=&f"(tmp)
: "f"(fabsf (x) + almost_half), "f"(two23));
/* round(-0) == -0, and in general we'll always have the same
sign as our input. */
return copysignf (r, x);
}
weak_alias (__roundf, roundf)