Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpf / fits_s.h

diff --git a/gmp/mpf/fits_s.h b/gmp/mpf/fits_s.h
new file mode 100644 (file)
index 0000000..6306930
--- /dev/null
+++ b/gmp/mpf/fits_s.h
@@ -0,0 +1,64 @@
+/* mpf_fits_s*_p -- test whether an mpf fits a C signed type.
+
+Copyright 2001, 2002 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 3 of the License, or (at your
+option) any later version.
+
+The GNU MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+/* Notice this is equivalent to mpz_set_f + mpz_fits_s*_p.  */
+
+int
+FUNCTION (mpf_srcptr f)
+{
+  mp_size_t  fs, fn;
+  mp_srcptr  fp;
+  mp_exp_t   exp;
+  mp_limb_t  fl;
+
+  fs = SIZ(f);
+  if (fs == 0)
+    return 1;  /* zero fits */
+
+  exp = EXP(f);
+  if (exp < 1)
+    return 1;  /* -1 < f < 1 truncates to zero, so fits */
+
+  fp = PTR(f);
+  fn = ABS (fs);
+
+  if (exp == 1)
+    {
+      fl = fp[fn-1];
+    }
+#if GMP_NAIL_BITS != 0
+  else if (exp == 2 && MAXIMUM > GMP_NUMB_MAX)
+    {
+      fl = fp[fn-1];
+      if ((fl >> GMP_NAIL_BITS) != 0)
+       return 0;
+      fl = (fl << GMP_NUMB_BITS);
+      if (fn >= 2)
+        fl |= fp[fn-2];
+    }
+#endif
+  else
+    return 0;
+
+  return fl <= (fs >= 0 ? (mp_limb_t) MAXIMUM : - (mp_limb_t) MINIMUM);
+}