1 files changed, 70 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_setpayload_main.c b/sysdeps/ieee754/dbl-64/s_setpayload_main.c
new file mode 100644
index 0000000000..0e87c2a587
--- /dev/null
+++ b/sysdeps/ieee754/dbl-64/s_setpayload_main.c
@@ -0,0 +1,70 @@
+/* Set NaN payload.  dbl-64 version.
+   Copyright (C) 2016-2018 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.h>
+#include <math_private.h>
+#include <libm-alias-double.h>
+#include <nan-high-order-bit.h>
+#include <stdint.h>
+
+#define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG)
+#define BIAS 0x3ff
+#define PAYLOAD_DIG 51
+#define EXPLICIT_MANT_DIG 52
+
+int
+FUNC (double *x, double payload)
+{
+  uint32_t hx, lx;
+  EXTRACT_WORDS (hx, lx, payload);
+  int exponent = hx >> (EXPLICIT_MANT_DIG - 32);
+  /* Test if argument is (a) negative or too large; (b) too small,
+     except for 0 when allowed; (c) not an integer.  */
+  if (exponent >= BIAS + PAYLOAD_DIG
+      || (exponent < BIAS && !(SET_HIGH_BIT && hx == 0 && lx == 0)))
+    {
+      INSERT_WORDS (*x, 0, 0);
+      return 1;
+    }
+  int shift = BIAS + EXPLICIT_MANT_DIG - exponent;
+  if (shift < 32
+      ? (lx & ((1U << shift) - 1)) != 0
+      : (lx != 0 || (hx & ((1U << (shift - 32)) - 1)) != 0))
+    {
+      INSERT_WORDS (*x, 0, 0);
+      return 1;
+    }
+  if (exponent != 0)
+    {
+      hx &= (1U << (EXPLICIT_MANT_DIG - 32)) - 1;
+      hx |= 1U << (EXPLICIT_MANT_DIG - 32);
+      if (shift >= 32)
+	{
+	  lx = hx >> (shift - 32);
+	  hx = 0;
+	}
+      else if (shift != 0)
+	{
+	  lx = (lx >> shift) | (hx << (32 - shift));
+	  hx >>= shift;
+	}
+    }
+  hx |= 0x7ff00000 | (SET_HIGH_BIT ? 0x80000 : 0);
+  INSERT_WORDS (*x, hx, lx);
+  return 0;
+}