Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpf / cmp_si.c

diff --git a/gmp/mpf/cmp_si.c b/gmp/mpf/cmp_si.c
new file mode 100644 (file)
index 0000000..541ac36
--- /dev/null
+++ b/gmp/mpf/cmp_si.c
@@ -0,0 +1,107 @@
+/* mpf_cmp_si -- Compare a float with a signed integer.
+
+Copyright 1993, 1994, 1995, 1999, 2000, 2001, 2002, 2004 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"
+
+int
+mpf_cmp_si (mpf_srcptr u, long int vval)
+{
+  mp_srcptr up;
+  mp_size_t usize;
+  mp_exp_t uexp;
+  mp_limb_t ulimb;
+  int usign;
+
+  uexp = u->_mp_exp;
+  usize = u->_mp_size;
+
+  /* 1. Are the signs different?  */
+  if ((usize < 0) == (vval < 0)) /* don't use xor, type size may differ */
+    {
+      /* U and V are both non-negative or both negative.  */
+      if (usize == 0)
+       /* vval >= 0 */
+       return -(vval != 0);
+      if (vval == 0)
+       /* usize >= 0 */
+       return usize != 0;
+      /* Fall out.  */
+    }
+  else
+    {
+      /* Either U or V is negative, but not both.  */
+      return usize >= 0 ? 1 : -1;
+    }
+
+  /* U and V have the same sign and are both non-zero.  */
+
+  usign = usize >= 0 ? 1 : -1;
+  usize = ABS (usize);
+  vval = ABS (vval);
+
+  /* 2. Are the exponents different (V's exponent == 1)?  */
+#if GMP_NAIL_BITS != 0
+  if (uexp > 1 + ((unsigned long) vval > GMP_NUMB_MAX))
+    return usign;
+  if (uexp < 1 + ((unsigned long) vval > GMP_NUMB_MAX))
+    return -usign;
+#else
+  if (uexp > 1)
+    return usign;
+  if (uexp < 1)
+    return -usign;
+#endif
+
+  up = u->_mp_d;
+
+  ulimb = up[usize - 1];
+#if GMP_NAIL_BITS != 0
+  if (usize >= 2 && uexp == 2)
+    {
+      if ((ulimb >> GMP_NAIL_BITS) != 0)
+       return usign;
+      ulimb = (ulimb << GMP_NUMB_BITS) | up[usize - 2];
+      usize--;
+    }
+#endif
+  usize--;
+
+  /* 3. Compare the most significant mantissa limb with V.  */
+  if (ulimb > (unsigned long) vval)
+    return usign;
+  else if (ulimb < (unsigned long) vval)
+    return -usign;
+
+  /* Ignore zeroes at the low end of U.  */
+  while (*up == 0)
+    {
+      up++;
+      usize--;
+    }
+
+  /* 4. Now, if the number of limbs are different, we have a difference
+     since we have made sure the trailing limbs are not zero.  */
+  if (usize > 0)
+    return usign;
+
+  /* Wow, we got zero even if we tried hard to avoid it.  */
+  return 0;
+}