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062e53c195
The alpha version of ceil wrongly return sNaN for sNaN input. Fix that by checking for NaN and by returning the input value added with itself in that case. Finally remove the code to handle inexact exception, ceil should never generate such an exception. Changelog: * sysdeps/alpha/fpu/s_ceil.c (__ceil): Add argument with itself when it is a NaN. [_IEEE_FP_INEXACT] Remove. * sysdeps/alpha/fpu/s_ceilf.c (__ceilf): Likewise.
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* Copyright (C) 1998-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <math.h>
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#include <math_ldbl_opt.h>
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/* Use the -inf rounding mode conversion instructions to implement
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ceil, via something akin to -floor(-x). This is much faster than
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playing with the fpcr to achieve +inf rounding mode. */
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double
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__ceil (double x)
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{
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if (isnan (x))
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return x + x;
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if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */
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{
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double tmp1, new_x;
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new_x = -x;
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__asm (
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"cvttq/svm %2,%1\n\t"
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"cvtqt/m %1,%0\n\t"
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: "=f"(new_x), "=&f"(tmp1)
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: "f"(new_x));
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/* Fix up the negation we did above, as well as handling -0 properly. */
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x = copysign(new_x, x);
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}
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return x;
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}
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weak_alias (__ceil, ceil)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__ceil, __ceill)
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weak_alias (__ceil, ceill)
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#endif
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#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
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compat_symbol (libm, __ceil, ceill, GLIBC_2_0);
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#endif
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