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RISC-V: Use builtin for copysign and copysignf

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The built-in functions `builtin_{copysign, copysignf}` are sufficient to generate correct `fsgnj.d/fsgnj.s` instructions on RISC-V.

Signed-off-by: Julian Zhu <jz531210@gmail.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Julian Zhu 2024-09-11 16:05:12 +08:00 committed by Adhemerval Zanella
parent 53fcdf5f74
commit d2264de5db
2 changed files with 0 additions and 58 deletions
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29
sysdeps/riscv/rvd/s_copysign.c
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/* Copy sign bit between floating-point values. RISC-V version.
Copyright (C) 2017-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#define NO_MATH_REDIRECT
#include <math.h>
#include <libm-alias-double.h>
double
__copysign (double x, double y)
{
asm ("fsgnj.d %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
return x;
}
libm_alias_double (__copysign, copysign)

29
sysdeps/riscv/rvf/s_copysignf.c
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/* copysignf(). RISC-V version.
Copyright (C) 2017-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#define NO_MATH_REDIRECT
#include <math.h>
#include <libm-alias-float.h>
float
__copysignf (float x, float y)
{
asm ("fsgnj.s %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
return x;
}
libm_alias_float (__copysign, copysign)