Initial revision

1 files changed, 84 insertions, 0 deletions

diff --git a/mpq/cmp_ui.c b/mpq/cmp_ui.c
new file mode 100644
index 000000000..bdecec5f8
--- /dev/null
+++ b/mpq/cmp_ui.c
@@ -0,0 +1,84 @@
+/* mpq_cmp_ui(u,vn,vd) -- Compare U with Vn/Vd.  Return positive, zero, or
+   negative based on if U > V, U == V, or U < V.  Vn and Vd may have
+   common factors.
+
+Copyright (C) 1993, 1994, 1996 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+/* gmp.h defines a macro for mpq_cmp_ui.  */
+#undef mpq_cmp_ui
+
+int
+#if __STDC__
+mpq_cmp_ui (const MP_RAT *op1, unsigned long int num2, unsigned long int den2)
+#else
+mpq_cmp_ui (op1, num2, den2)
+     const MP_RAT *op1;
+     unsigned long int num2;
+     unsigned long int den2;
+#endif
+{
+  mp_size_t num1_size = op1->_mp_num._mp_size;
+  mp_size_t den1_size = op1->_mp_den._mp_size;
+  mp_size_t tmp1_size, tmp2_size;
+  mp_ptr tmp1_ptr, tmp2_ptr;
+  mp_size_t num1_sign;
+  mp_limb_t cy_limb;
+  int cc;
+  TMP_DECL (marker);
+
+  if (num1_size == 0)
+    return -(num2 != 0);
+  if (num1_size < 0)
+    return num1_size;
+  if (num2 == 0)
+    return num1_size;
+
+  num1_sign = num1_size;
+  num1_size = ABS (num1_size);
+
+  /* NUM1 x DEN2 is either TMP1_SIZE limbs or TMP1_SIZE-1 limbs.
+     Same for NUM1 x DEN1 with respect to TMP2_SIZE.  */
+  if (num1_size > den1_size + 1)
+    /* NUM1 x DEN2 is surely larger in magnitude than NUM2 x DEN1.  */
+    return num1_sign;
+  if (den1_size > num1_sign + 1)
+    /* NUM1 x DEN2 is surely smaller in magnitude than NUM2 x DEN1.  */
+    return -num1_sign;
+
+  TMP_MARK (marker);
+  tmp1_ptr = (mp_ptr) TMP_ALLOC ((num1_size + 1) * BYTES_PER_MP_LIMB);
+  tmp2_ptr = (mp_ptr) TMP_ALLOC ((den1_size + 1) * BYTES_PER_MP_LIMB);
+
+  cy_limb = mpn_mul_1 (tmp1_ptr, op1->_mp_num._mp_d, num1_size, den2);
+  tmp1_ptr[num1_size] = cy_limb;
+  tmp1_size = num1_size + (cy_limb != 0);
+
+  cy_limb = mpn_mul_1 (tmp2_ptr, op1->_mp_den._mp_d, den1_size, num2);
+  tmp2_ptr[den1_size] = cy_limb;
+  tmp2_size = den1_size + (cy_limb != 0);
+
+  cc = tmp1_size - tmp2_size != 0
+    ? tmp1_size - tmp2_size : mpn_cmp (tmp1_ptr, tmp2_ptr, tmp1_size);
+  TMP_FREE (marker);
+  return (num1_sign < 0) ? -cc : cc;
+}