newlib/libm/machine/riscv/e_sqrt.c

   1 /*
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright © 2020 Keith Packard
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above
  14  *    copyright notice, this list of conditions and the following
  15  *    disclaimer in the documentation and/or other materials provided
  16  *    with the distribution.
  17  *
  18  * 3. Neither the name of the copyright holder nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  27  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  28  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  29  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  31  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  33  * OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <math.h>
  37 #include "math_config.h"
  38
  39 #if defined(__RISCV_HARD_FLOAT) && __RISCV_HARD_FLOAT >= 64
  40
  41 double
  42 __ieee754_sqrt (double x)
  43 {
  44         double result;
  45         asm ("fsqrt.d %0, %1" : "=f" (result) : "f" (x));
  46         return result;
  47 }
  48
  49 #else
  50 #include "../../math/e_sqrt.c"
  51 #endif