Imported gcc-4.4.3

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

diff --git a/mpfr/set.c b/mpfr/set.c
new file mode 100644 (file)
index 0000000..85618e4
--- /dev/null
+++ b/mpfr/set.c
@@ -0,0 +1,81 @@
+/* mpfr_set -- copy of a floating-point number
+
+Copyright 1999, 2001, 2002, 2003, 2004, 2005, 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"
+
+/* set a to abs(b) * signb: a=b when signb = SIGN(b), a=abs(b) when signb=1 */
+int
+mpfr_set4 (mpfr_ptr a, mpfr_srcptr b, mp_rnd_t rnd_mode, int signb)
+{
+  /* Sign is ALWAYS copied */
+  MPFR_SET_SIGN (a, signb);
+
+  /* Exponent is also always copied since if the number is singular,
+     the exponent field determined the number.
+     Can't use MPFR_SET_EXP since the exponent may be singular */
+  MPFR_EXP (a) = MPFR_EXP (b);
+
+  if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (b)))
+    {
+      /* MPFR_SET_NAN, MPFR_SET_ZERO and MPFR_SET_INF are useless
+         since MPFR_EXP (a) = MPFR_EXP (b) does the job */
+      if (MPFR_IS_NAN (b))
+        MPFR_RET_NAN;
+      else
+        MPFR_RET (0);
+    }
+  else if (MPFR_LIKELY (MPFR_PREC (b) == MPFR_PREC (a)))
+    {
+      /* Same precision and b is not singular:
+       * just copy the mantissa, and set the exponent and the sign
+       * The result is exact. */
+      MPN_COPY (MPFR_MANT (a), MPFR_MANT (b),
+                (MPFR_PREC (b) + BITS_PER_MP_LIMB-1)/BITS_PER_MP_LIMB);
+      MPFR_RET (0);
+    }
+  else
+    {
+      int inex;
+
+      /* Else Round B inside a */
+      MPFR_RNDRAW (inex, a, MPFR_MANT (b), MPFR_PREC (b), rnd_mode, signb,
+                   if (MPFR_UNLIKELY ( ++MPFR_EXP (a) > __gmpfr_emax))
+                    return mpfr_overflow (a, rnd_mode, signb) );
+      MPFR_RET (inex);
+    }
+}
+
+/* Set a to b  */
+#undef mpfr_set
+int
+mpfr_set (mpfr_ptr a, mpfr_srcptr b, mp_rnd_t rnd_mode)
+{
+  return mpfr_set4 (a, b, rnd_mode, MPFR_SIGN (b));
+}
+
+/* Set a to |b| */
+#undef mpfr_abs
+int
+mpfr_abs (mpfr_ptr a, mpfr_srcptr b, mp_rnd_t rnd_mode)
+{
+  return mpfr_set4 (a, b, rnd_mode, MPFR_SIGN_POS);
+}