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RISC-V: Use builtin for fma and fmaf

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The built-in functions `builtin_{fma, fmaf}` are sufficient to generate correct `fmadd.d`/`fmadd.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 15:13:19 +08:00 • committed by Adhemerval Zanella
parent d2264de5db
commit 32445b6dd2
3 changed files with 4 additions and 68 deletions
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4
sysdeps/riscv/rvd/math-use-builtins-fma.h Normal file
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@ -0,0 +1,4 @@
#define USE_FMA_BUILTIN 1
#define USE_FMAF_BUILTIN 1
#define USE_FMAL_BUILTIN 0
#define USE_FMAF128_BUILTIN 0

37
sysdeps/riscv/rvd/s_fma.c
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@ -1,37 +0,0 @@
/* Double precision floating point fused multiply-add. 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
#define dfmal __hide_dfmal
#define f32xfmaf64 __hide_f32xfmaf64
#include <math.h>
#undef dfmal
#undef f32xfmaf64
#include <fenv.h>
#include <ieee754.h>
#include <libm-alias-double.h>
#include <math-narrow-alias.h>
double
__fma (double x, double y, double z)
{
asm ("fmadd.d %0, %1, %2, %3" : "=f" (x) : "f" (x), "f" (y), "f" (z));
return x;
}
libm_alias_double (__fma, fma)
libm_alias_double_narrow (__fma, fma)

31
sysdeps/riscv/rvf/s_fmaf.c
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@ -1,31 +0,0 @@
/* fmaf(). 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 <fenv.h>
#include <ieee754.h>
#include <libm-alias-float.h>
float
__fmaf (float x, float y, float z)
{
asm ("fmadd.s %0, %1, %2, %3" : "=f" (x) : "f" (x), "f" (y), "f" (z));
return x;
}
libm_alias_float (__fma, fma)