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46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* Compute square root for double. ARM version.
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Copyright (C) 2016-2018 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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#ifdef __SOFTFP__
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/* Use architecture-indendent sqrt implementation. */
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# include <sysdeps/ieee754/dbl-64/e_sqrt.c>
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#else
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/* Use VFP square root instruction. */
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# include <math.h>
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# include <sysdep.h>
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double
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__ieee754_sqrt (double x)
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{
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double ret;
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# if __ARM_ARCH >= 6
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asm ("vsqrt.f64 %P0, %P1" : "=w" (ret) : "w" (x));
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# else
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/* As in GCC, for VFP9 Erratum 760019 avoid overwriting the
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input. */
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asm ("vsqrt.f64 %P0, %P1" : "=&w" (ret) : "w" (x));
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# endif
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return ret;
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}
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strong_alias (__ieee754_sqrt, __sqrt_finite)
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#endif
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