Imported gcc-4.4.3

[msp430-gcc.git] / mpfr / isinteger.c

diff --git a/mpfr/isinteger.c b/mpfr/isinteger.c
new file mode 100644 (file)
index 0000000..fee7dbf
--- /dev/null
+++ b/mpfr/isinteger.c
@@ -0,0 +1,59 @@
+/* mpfr_integer_p -- test if a mpfr variable is integer.
+
+Copyright 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+
+#include "mpfr-impl.h"
+
+int
+mpfr_integer_p (mpfr_srcptr x)
+{
+  mp_exp_t expo;
+  mp_prec_t prec;
+  mp_size_t xn;
+  mp_limb_t *xp;
+
+  if (MPFR_UNLIKELY( MPFR_IS_SINGULAR(x)))
+    return (MPFR_IS_ZERO(x));
+
+  expo = MPFR_GET_EXP (x);
+  if (expo <= 0)
+    return 0;
+
+  prec = MPFR_PREC(x);
+  if ((mpfr_uexp_t) expo >= (mpfr_uexp_t) prec)
+    return 1;
+
+  /* 0 < expo < prec */
+
+  xn =  (mp_size_t) ((prec - 1) / BITS_PER_MP_LIMB);  /* index of last limb */
+  xn -= (mp_size_t) (expo / BITS_PER_MP_LIMB);
+  /* now the index of the last limb containing bits of the fractional part */
+
+  xp = MPFR_MANT(x);
+  MPFR_ASSERTN(xn >= 0);
+  if (xp[xn] << (expo % BITS_PER_MP_LIMB) != 0)
+    return 0;
+  while (--xn >= 0)
+    if (xp[xn] != 0)
+      return 0;
+  return 1;
+}