1 files changed, 37 insertions, 0 deletions
diff --git a/sysdeps/riscv/rvd/fix-float-double-convert-nan.h b/sysdeps/riscv/rvd/fix-float-double-convert-nan.h
new file mode 100644
index 0000000000..cab003f3c1
--- /dev/null
+++ b/sysdeps/riscv/rvd/fix-float-double-convert-nan.h
@@ -0,0 +1,37 @@
+/* Fix for conversion of float NAN to double.  RISC-V version..
+   Copyright (C) 2022 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/>.  */
+
+#ifndef FIX_FLOAT_DOUBLE_CONVERT_NAN_H
+#define FIX_FLOAT_DOUBLE_CONVERT_NAN_H
+
+#include <math.h>
+
+/* RISC-V rvd instructions do not preserve the signbit of NAN
+   when converting from float to double.  */
+static inline double
+keep_sign_conversion (float flt)
+{
+  if (__glibc_unlikely (isnan (flt)))
+  {
+    float x = copysignf (1.f, flt);
+    return copysign ((double) flt, (double) x);
+  }
+  return flt;
+}
+
+#endif