Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpz / cmp_d.c

diff --git a/gmp/mpz/cmp_d.c b/gmp/mpz/cmp_d.c
new file mode 100644 (file)
index 0000000..fd635a6
--- /dev/null
+++ b/gmp/mpz/cmp_d.c
@@ -0,0 +1,134 @@
+/* mpz_cmp_d -- compare absolute values of mpz and double.
+
+Copyright 2001, 2002, 2003 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 "config.h"
+
+#if HAVE_FLOAT_H
+#include <float.h>  /* for DBL_MAX */
+#endif
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+#define RETURN_CMP(zl, dl)                      \
+  do {                                          \
+    zlimb = (zl);                               \
+    dlimb = (dl);                               \
+    if (zlimb != dlimb)                         \
+      return (zlimb >= dlimb ? ret : -ret);     \
+  } while (0)
+
+#define RETURN_NONZERO(ptr, size, val)          \
+  do {                                          \
+    mp_size_t __i;                              \
+    for (__i = (size)-1; __i >= 0; __i--)       \
+      if ((ptr)[__i] != 0)                      \
+        return val;                             \
+    return 0;                                   \
+  } while (0)
+
+
+int
+mpz_cmp_d (mpz_srcptr z, double d)
+{
+  mp_limb_t  darray[LIMBS_PER_DOUBLE], zlimb, dlimb;
+  mp_srcptr  zp;
+  mp_size_t  zsize;
+  int        dexp, ret;
+
+  /* d=NaN is an invalid operation, there's no sensible return value.
+     d=Inf or -Inf is always bigger than z.  */
+  DOUBLE_NAN_INF_ACTION (d, __gmp_invalid_operation (), goto z_zero);
+
+  /* 1. Either operand zero. */
+  zsize = SIZ(z);
+  if (d == 0.0)
+    return zsize;
+  if (zsize == 0)
+    {
+    z_zero:
+      return (d < 0.0 ? 1 : -1);
+    }
+
+  /* 2. Opposite signs. */
+  if (zsize >= 0)
+    {
+      if (d < 0.0)
+        return 1;    /* >=0 cmp <0 */
+      ret = 1;
+    }
+  else
+    {
+      if (d >= 0.0)
+        return -1;   /* <0 cmp >=0 */
+      ret = -1;
+      d = -d;
+      zsize = -zsize;
+    }
+
+  /* 3. Small d, knowing abs(z) >= 1. */
+  if (d < 1.0)
+    return ret;
+
+  dexp = __gmp_extract_double (darray, d);
+  ASSERT (dexp >= 1);
+
+  /* 4. Check for different high limb positions. */
+  if (zsize != dexp)
+    return (zsize >= dexp ? ret : -ret);
+
+  /* 5. Limb data. */
+  zp = PTR(z);
+
+#if LIMBS_PER_DOUBLE == 2
+  RETURN_CMP (zp[zsize-1], darray[1]);
+  if (zsize == 1)
+    return (darray[0] != 0 ? -ret : 0);
+
+  RETURN_CMP (zp[zsize-2], darray[0]);
+  RETURN_NONZERO (zp, zsize-2, ret);
+#endif
+
+#if LIMBS_PER_DOUBLE == 3
+  RETURN_CMP (zp[zsize-1], darray[2]);
+  if (zsize == 1)
+    return ((darray[0] | darray[1]) != 0 ? -ret : 0);
+
+  RETURN_CMP (zp[zsize-2], darray[1]);
+  if (zsize == 2)
+    return (darray[0] != 0 ? -ret : 0);
+
+  RETURN_CMP (zp[zsize-3], darray[0]);
+  RETURN_NONZERO (zp, zsize-3, ret);
+#endif
+
+#if LIMBS_PER_DOUBLE >= 4
+  {
+    int i;
+    for (i = 1; i <= LIMBS_PER_DOUBLE; i++)
+      {
+       RETURN_CMP (zp[zsize-i], darray[LIMBS_PER_DOUBLE-i]);
+       if (i >= zsize)
+         RETURN_NONZERO (darray, LIMBS_PER_DOUBLE-i, -ret);
+      }
+    RETURN_NONZERO (zp, zsize-LIMBS_PER_DOUBLE, ret);
+  }
+#endif
+}