RISC-V: Use builtin for fma and fmaf

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>

3 files changed, 4 insertions, 68 deletions

diff --git a/sysdeps/riscv/rvd/math-use-builtins-fma.h b/sysdeps/riscv/rvd/math-use-builtins-fma.h
new file mode 100644
index 0000000..eede75a
--- /dev/null
+++ b/sysdeps/riscv/rvd/math-use-builtins-fma.h
@@ -0,0 +1,4 @@
+#define USE_FMA_BUILTIN 1
+#define USE_FMAF_BUILTIN 1
+#define USE_FMAL_BUILTIN 0
+#define USE_FMAF128_BUILTIN 0
diff --git a/sysdeps/riscv/rvd/s_fma.c b/sysdeps/riscv/rvd/s_fma.c
deleted file mode 100644
index fb4b6fb..0000000
--- a/sysdeps/riscv/rvd/s_fma.c
+++ /dev/null
@@ -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)
diff --git a/sysdeps/riscv/rvf/s_fmaf.c b/sysdeps/riscv/rvf/s_fmaf.c
deleted file mode 100644
index 1f1ad3f..0000000
--- a/sysdeps/riscv/rvf/s_fmaf.c
+++ /dev/null
@@ -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)