Move m68k from ports to libc

[thirdparty/glibc.git] / sysdeps / m68k / m680x0 / fpu / s_llrint.c

diff --git a/sysdeps/m68k/m680x0/fpu/s_llrint.c b/sysdeps/m68k/m680x0/fpu/s_llrint.c
new file mode 100644 (file)
index 0000000..0734ac3
--- /dev/null
+++ b/sysdeps/m68k/m680x0/fpu/s_llrint.c
@@ -0,0 +1,75 @@
+/* Round argument to nearest integral value according to current rounding
+   direction.
+   Copyright (C) 1997-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
+
+   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 "mathimpl.h"
+
+long long int
+__llrint (double x)
+{
+  int32_t e;
+  u_int32_t h, l, s;
+  long long int result;
+
+  x = __m81_u(__rint) (x);
+
+  /* We could use __fixxfdi from libgcc, but here we can take advantage of
+     the known floating point format.  */
+  EXTRACT_WORDS (h, l, x);
+
+  e = ((h >> 20) & 0x7ff) - 0x3ff;
+  if (e < 0)
+    return 0;
+  s = h;
+  h &= 0xfffff;
+  h |= 0x100000;
+
+  if (e < 63)
+    {
+      if (e > 52)
+       {
+         h <<= e - 52;
+         h |= l >> (84 - e);
+         l <<= e - 52;
+         result = ((long long int) h << 32) | l;
+       }
+      else if (e > 20)
+       {
+         l >>= 52 - e;
+         l |= h << (e - 20);
+         h >>= 52 - e;
+         result = ((long long int) h << 32) | l;
+       }
+      else
+       result = h >> (20 - e);
+      if (s & 0x80000000)
+       result = -result;
+    }
+  else
+    /* The number is too large or not finite.  The standard leaves it
+       undefined what to return when the number is too large to fit in a
+       `long long int'.  */
+    result = -1LL;
+
+  return result;
+}
+
+weak_alias (__llrint, llrint)