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18f2945ae9
This patch optimizes the FPSCR update on exception and rounding change functions by just updating its value if new value if different from current one. It also optimizes fedisableexcept and feenableexcept by removing an unecessary FPSCR read.
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* Clear given exceptions in current floating-point environment.
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Copyright (C) 1997-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <fenv_libc.h>
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#undef feclearexcept
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int
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__feclearexcept (int excepts)
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{
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fenv_union_t u, n;
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/* Get the current state. */
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u.fenv = fegetenv_register ();
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/* Clear the relevant bits. */
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n.l = u.l & ~((-(excepts >> (31 - FPSCR_VX) & 1) & FE_ALL_INVALID)
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| (excepts & FPSCR_STICKY_BITS));
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/* Put the new state in effect. */
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if (u.l != n.l)
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fesetenv_register (n.fenv);
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/* Success. */
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return 0;
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}
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
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strong_alias (__feclearexcept, __old_feclearexcept)
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compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
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#endif
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libm_hidden_ver (__feclearexcept, feclearexcept)
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versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);
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