1 files changed, 34 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_fsub.c b/sysdeps/ieee754/dbl-64/s_fsub.c
new file mode 100644
index 0000000000..c3b911e801
--- /dev/null
+++ b/sysdeps/ieee754/dbl-64/s_fsub.c
@@ -0,0 +1,34 @@
+/* Subtract double values, narrowing the result to float.
+   Copyright (C) 2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+#define f32subf64 __hide_f32subf64
+#define f32subf32x __hide_f32subf32x
+#define fsubl __hide_fsubl
+#include <math.h>
+#undef f32subf64
+#undef f32subf32x
+#undef fsubl
+
+#include <math-narrow.h>
+
+float
+__fsub (double x, double y)
+{
+  NARROW_SUB_ROUND_TO_ODD (x, y, float, union ieee754_double, , mantissa1);
+}
+libm_alias_float_double (sub)