1 files changed, 72 insertions, 0 deletions
diff --git a/sysdeps/ieee754/soft-fp/s_ffma.c b/sysdeps/ieee754/soft-fp/s_ffma.c
new file mode 100644
index 0000000000..3ab5844b0b
--- /dev/null
+++ b/sysdeps/ieee754/soft-fp/s_ffma.c
@@ -0,0 +1,72 @@
+/* Fused multiply-add of double values, narrowing the result to float,
+   using soft-fp.
+   Copyright (C) 2021 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 f32fmaf64 __hide_f32fmaf64
+#define f32fmaf32x __hide_f32fmaf32x
+#define ffmal __hide_ffmal
+#include <math.h>
+#undef f32fmaf64
+#undef f32fmaf32x
+#undef ffmal
+
+#include <math-narrow.h>
+#include <libc-diag.h>
+
+/* R_e is not set in cases where it is not used in packing, but the
+   compiler does not see that it is set in all cases where it is
+   used, resulting in warnings that it may be used uninitialized.
+   The location of the warning differs in different versions of GCC,
+   it may be where R is defined using a macro or it may be where the
+   macro is defined.  */
+DIAG_PUSH_NEEDS_COMMENT;
+DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wmaybe-uninitialized");
+
+#include <soft-fp.h>
+#include <single.h>
+#include <double.h>
+
+float
+__ffma (double x, double y, double z)
+{
+  FP_DECL_EX;
+  FP_DECL_D (X);
+  FP_DECL_D (Y);
+  FP_DECL_D (Z);
+  FP_DECL_D (R);
+  FP_DECL_S (RN);
+  float ret;
+
+  FP_INIT_ROUNDMODE;
+  FP_UNPACK_D (X, x);
+  FP_UNPACK_D (Y, y);
+  FP_UNPACK_D (Z, z);
+  FP_FMA_D (R, X, Y, Z);
+#if _FP_W_TYPE_SIZE < _FP_FRACBITS_D
+  FP_TRUNC_COOKED (S, D, 1, 2, RN, R);
+#else
+  FP_TRUNC_COOKED (S, D, 1, 1, RN, R);
+#endif
+  FP_PACK_S (ret, RN);
+  FP_HANDLE_EXCEPTIONS;
+  CHECK_NARROW_FMA (ret, x, y, z);
+  return ret;
+}
+DIAG_POP_NEEDS_COMMENT;
+
+libm_alias_float_double (fma)