Implementation of m68k specific llrint function.

sysdeps/m68k/fpu/s_llrint.c

@@ -0,0 +1,62 @@
+/* Round argument to nearest integral value according to current rounding
+   direction.
+   Copyright (C) 1997 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#define __LIBC_M81_MATH_INLINES
+#include <math.h>
+#include "math_private.h"
+
+long long int
+__llrint (long double x)
+{
+  int32_t se, sx;
+  u_int32_t h, l;
+  long long int result;
+
+  x = __m81_u(__rintl) (x);
+
+  /* We could use __fixxfdi from libgcc, but here we can take advantage of
+     the known floating point format.  */
+  GET_LDOUBLE_WORDS (se, h, l, x);
+
+  sx = se & (1 << 15);
+  se = (se ^ sx) - 0x3fff;
+
+  if (se < 64)
+    {
+      if (se > 31)
+	result = (((long long int) (h >> (63 - se)) << 32)
+		  | (l >> (63 - se)) | (h << (se - 31)));
+      else
+	result = h >> (31 - se);
+      if (sx)
+	result = -result;
+    }
+  else
+    /* Too large.  The number is either +-inf or NaN or it is too
+       large to be effected by rounding.  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)