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56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* Double-precision floating point square root wrapper.
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Copyright (C) 2004, 2007, 2012 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 <math_ldbl_opt.h>
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#include <math.h>
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#include <math_private.h>
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#include <fenv_libc.h>
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double
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__sqrt (double x) /* wrapper sqrt */
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{
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double z;
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/* Power4 (ISA V2.0) and above implement sqrt in hardware. */
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__asm __volatile (
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" fsqrt %0,%1\n"
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: "=f" (z)
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: "f" (x));
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#ifdef _IEEE_LIBM
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return z;
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#else
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if (__builtin_expect (_LIB_VERSION == _IEEE_, 0))
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return z;
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if (__builtin_expect (x != x, 0))
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return z;
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if (__builtin_expect (x < 0.0, 0))
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return __kernel_standard (x, x, 26); /* sqrt(negative) */
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else
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return z;
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#endif
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}
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weak_alias (__sqrt, sqrt)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__sqrt, __sqrtl) weak_alias (__sqrt, sqrtl)
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#endif
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#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
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compat_symbol (libm, __sqrt, sqrtl, GLIBC_2_0);
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#endif
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