55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* Square root of double value, narrowing the result to float, using soft-fp.
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Copyright (C) 2021 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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<https://www.gnu.org/licenses/>. */
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#define f32sqrtf64 __hide_f32sqrtf64
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#define f32sqrtf32x __hide_f32sqrtf32x
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#define fsqrtl __hide_fsqrtl
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#include <math.h>
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#undef f32sqrtf64
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#undef f32sqrtf32x
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#undef fsqrtl
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#include <math-narrow.h>
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#include <soft-fp.h>
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#include <single.h>
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#include <double.h>
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float
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__fsqrt (double x)
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{
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FP_DECL_EX;
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FP_DECL_D (X);
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FP_DECL_D (R);
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FP_DECL_S (RN);
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float ret;
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FP_INIT_ROUNDMODE;
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FP_UNPACK_D (X, x);
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FP_SQRT_D (R, X);
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#if _FP_W_TYPE_SIZE < _FP_FRACBITS_D
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FP_TRUNC_COOKED (S, D, 1, 2, RN, R);
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#else
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FP_TRUNC_COOKED (S, D, 1, 1, RN, R);
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#endif
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FP_PACK_S (ret, RN);
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FP_HANDLE_EXCEPTIONS;
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CHECK_NARROW_SQRT (ret, x);
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return ret;
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}
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libm_alias_float_double (sqrt)
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