1 files changed, 92 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/math_err.c b/sysdeps/ieee754/dbl-64/math_err.c
new file mode 100644
index 0000000000..efd7ef0832
--- /dev/null
+++ b/sysdeps/ieee754/dbl-64/math_err.c
@@ -0,0 +1,92 @@
+/* Double-precision math error handling.
+   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/>.  */
+
+#include <math-barriers.h>
+#include "math_config.h"
+
+#if WANT_ERRNO
+#include <errno.h>
+/* NOINLINE reduces code size and avoids making math functions non-leaf
+   when the error handling is inlined.  */
+NOINLINE static double
+with_errno (double y, int e)
+{
+  errno = e;
+  return y;
+}
+#else
+#define with_errno(x, e) (x)
+#endif
+
+/* NOINLINE reduces code size.  */
+NOINLINE static double
+xflow (uint32_t sign, double y)
+{
+  y = math_opt_barrier (sign ? -y : y) * y;
+  return with_errno (y, ERANGE);
+}
+
+attribute_hidden double
+__math_uflow (uint32_t sign)
+{
+  return xflow (sign, 0x1p-767);
+}
+
+#if WANT_ERRNO_UFLOW
+/* Underflows to zero in some non-nearest rounding mode, setting errno
+   is valid even if the result is non-zero, but in the subnormal range.  */
+attribute_hidden double
+__math_may_uflow (uint32_t sign)
+{
+  return xflow (sign, 0x1.8p-538);
+}
+#endif
+
+attribute_hidden double
+__math_oflow (uint32_t sign)
+{
+  return xflow (sign, 0x1p769);
+}
+
+attribute_hidden double
+__math_divzero (uint32_t sign)
+{
+  double y = math_opt_barrier (sign ? -1.0 : 1.0) / 0.0;
+  return with_errno (y, ERANGE);
+}
+
+attribute_hidden double
+__math_invalid (double x)
+{
+  double y = (x - x) / (x - x);
+  return isnan (x) ? y : with_errno (y, EDOM);
+}
+
+/* Check result and set errno if necessary.  */
+
+attribute_hidden double
+__math_check_uflow (double y)
+{
+  return y == 0.0 ? with_errno (y, ERANGE) : y;
+}
+
+attribute_hidden double
+__math_check_oflow (double y)
+{
+  return isinf (y) ? with_errno (y, ERANGE) : y;
+}