Add libgmp 6.2.0 to third_party
Don't build it yet. That will come in the next review.
Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/mpq/cmp_ui.c b/third_party/gmp/mpq/cmp_ui.c
new file mode 100644
index 0000000..9d99a9a
--- /dev/null
+++ b/third_party/gmp/mpq/cmp_ui.c
@@ -0,0 +1,99 @@
+/* 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 1993, 1994, 1996, 2000-2003, 2005, 2014, 2018 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 either:
+
+ * 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.
+
+or
+
+ * the GNU General Public License as published by the Free Software
+ Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+or both in parallel, as here.
+
+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 General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library. If not,
+see https://www.gnu.org/licenses/. */
+
+#include "gmp-impl.h"
+
+int
+_mpq_cmp_ui (mpq_srcptr op1, unsigned long int num2, unsigned long int den2)
+{
+ mp_size_t num1_size = SIZ(NUM(op1));
+ mp_size_t den1_size = SIZ(DEN(op1));
+ mp_size_t tmp1_size, tmp2_size;
+ mp_ptr tmp1_ptr, tmp2_ptr;
+ mp_limb_t cy_limb;
+ int cc;
+ TMP_DECL;
+
+#if GMP_NAIL_BITS != 0
+ if ((num2 | den2) > GMP_NUMB_MAX)
+ {
+ mpq_t op2;
+ mpq_init (op2);
+ mpz_set_ui (mpq_numref (op2), num2);
+ mpz_set_ui (mpq_denref (op2), den2);
+ cc = mpq_cmp (op1, op2);
+ mpq_clear (op2);
+ return cc;
+ }
+#endif
+
+ /* need canonical sign to get right result */
+ ASSERT (den1_size > 0);
+
+ if (UNLIKELY (den2 == 0))
+ DIVIDE_BY_ZERO;
+
+ if (num2 == 0)
+ return num1_size;
+ if (num1_size <= 0)
+ return -1;
+
+ /* NUM1 x DEN2 is either TMP1_SIZE limbs or TMP1_SIZE-1 limbs.
+ Same for NUM2 x DEN1 with respect to TMP2_SIZE. */
+ /* If frac2 <= 1 (i.e. num2 <= den2), shortcut with a simpler
+ condition: num1 > den1. Here we only test sizes. */
+ if (num1_size > den1_size + (num2 > den2))
+ /* NUM1 x DEN2 is surely larger in magnitude than NUM2 x DEN1. */
+ return num1_size;
+ if (den1_size > num1_size + (den2 > num2))
+ /* NUM1 x DEN2 is surely smaller in magnitude than NUM2 x DEN1. */
+ return -num1_size;
+
+ TMP_MARK;
+ TMP_ALLOC_LIMBS_2 (tmp1_ptr, num1_size + 1, tmp2_ptr, den1_size + 1);
+
+ cy_limb = mpn_mul_1 (tmp1_ptr, PTR(NUM(op1)), num1_size,
+ (mp_limb_t) den2);
+ tmp1_ptr[num1_size] = cy_limb;
+ tmp1_size = num1_size + (cy_limb != 0);
+
+ cy_limb = mpn_mul_1 (tmp2_ptr, PTR(DEN(op1)), den1_size,
+ (mp_limb_t) num2);
+ tmp2_ptr[den1_size] = cy_limb;
+ tmp2_size = den1_size + (cy_limb != 0);
+
+ cc = tmp1_size - tmp2_size;
+ cc = cc != 0 ? cc : mpn_cmp (tmp1_ptr, tmp2_ptr, tmp1_size);
+ TMP_FREE;
+ return cc;
+}