Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpq / cmp.c

diff --git a/gmp/mpq/cmp.c b/gmp/mpq/cmp.c
new file mode 100644 (file)
index 0000000..2ee540c
--- /dev/null
+++ b/gmp/mpq/cmp.c
@@ -0,0 +1,115 @@
+/* mpq_cmp(u,v) -- Compare U, V.  Return positive, zero, or negative
+   based on if U > V, U == V, or U < V.
+
+Copyright 1991, 1994, 1996, 2001, 2002, 2005 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"
+#include "longlong.h"
+
+int
+mpq_cmp (const MP_RAT *op1, const MP_RAT *op2)
+{
+  mp_size_t num1_size = op1->_mp_num._mp_size;
+  mp_size_t den1_size = op1->_mp_den._mp_size;
+  mp_size_t num2_size = op2->_mp_num._mp_size;
+  mp_size_t den2_size = op2->_mp_den._mp_size;
+  mp_size_t tmp1_size, tmp2_size;
+  mp_ptr tmp1_ptr, tmp2_ptr;
+  mp_size_t num1_sign;
+  int cc;
+  TMP_DECL;
+
+  /* need canonical signs to get right result */
+  ASSERT (den1_size > 0);
+  ASSERT (den2_size > 0);
+
+  if (num1_size == 0)
+    return -num2_size;
+  if (num2_size == 0)
+    return num1_size;
+  if ((num1_size ^ num2_size) < 0) /* I.e. are the signs different? */
+    return num1_size;
+
+  num1_sign = num1_size;
+  num1_size = ABS (num1_size);
+  num2_size = ABS (num2_size);
+
+  tmp1_size = num1_size + den2_size;
+  tmp2_size = num2_size + den1_size;
+
+  /* 1. Check to see if we can tell which operand is larger by just looking at
+     the number of limbs.  */
+
+  /* NUM1 x DEN2 is either TMP1_SIZE limbs or TMP1_SIZE-1 limbs.
+     Same for NUM1 x DEN1 with respect to TMP2_SIZE.  */
+  if (tmp1_size > tmp2_size + 1)
+    /* NUM1 x DEN2 is surely larger in magnitude than NUM2 x DEN1.  */
+    return num1_sign;
+  if (tmp2_size > tmp1_size + 1)
+    /* NUM1 x DEN2 is surely smaller in magnitude than NUM2 x DEN1.  */
+    return -num1_sign;
+
+  /* 2. Same, but compare the number of significant bits.  */
+  {
+    int cnt1, cnt2;
+    unsigned long int bits1, bits2;
+
+    count_leading_zeros (cnt1, op1->_mp_num._mp_d[num1_size - 1]);
+    count_leading_zeros (cnt2, op2->_mp_den._mp_d[den2_size - 1]);
+    bits1 = tmp1_size * GMP_NUMB_BITS - cnt1 - cnt2 + 2 * GMP_NAIL_BITS;
+
+    count_leading_zeros (cnt1, op2->_mp_num._mp_d[num2_size - 1]);
+    count_leading_zeros (cnt2, op1->_mp_den._mp_d[den1_size - 1]);
+    bits2 = tmp2_size * GMP_NUMB_BITS - cnt1 - cnt2 + 2 * GMP_NAIL_BITS;
+
+    if (bits1 > bits2 + 1)
+      return num1_sign;
+    if (bits2 > bits1 + 1)
+      return -num1_sign;
+  }
+
+  /* 3. Finally, cross multiply and compare.  */
+
+  TMP_MARK;
+  TMP_ALLOC_LIMBS_2 (tmp1_ptr,tmp1_size, tmp2_ptr,tmp2_size);
+
+  if (num1_size >= den2_size)
+    tmp1_size -= 0 == mpn_mul (tmp1_ptr,
+                              op1->_mp_num._mp_d, num1_size,
+                              op2->_mp_den._mp_d, den2_size);
+  else
+    tmp1_size -= 0 == mpn_mul (tmp1_ptr,
+                              op2->_mp_den._mp_d, den2_size,
+                              op1->_mp_num._mp_d, num1_size);
+
+   if (num2_size >= den1_size)
+     tmp2_size -= 0 == mpn_mul (tmp2_ptr,
+                               op2->_mp_num._mp_d, num2_size,
+                               op1->_mp_den._mp_d, den1_size);
+   else
+     tmp2_size -= 0 == mpn_mul (tmp2_ptr,
+                               op1->_mp_den._mp_d, den1_size,
+                               op2->_mp_num._mp_d, num2_size);
+
+
+  cc = tmp1_size - tmp2_size != 0
+    ? tmp1_size - tmp2_size : mpn_cmp (tmp1_ptr, tmp2_ptr, tmp1_size);
+  TMP_FREE;
+  return num1_sign < 0 ? -cc : cc;
+}