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/set_d.c b/third_party/gmp/mpq/set_d.c
new file mode 100644
index 0000000..3f3fab0
--- /dev/null
+++ b/third_party/gmp/mpq/set_d.c
@@ -0,0 +1,165 @@
+/* mpq_set_d(mpq_t q, double d) -- Set q to d without rounding.
+
+Copyright 2000, 2002, 2003, 2012, 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 "config.h"
+
+#if HAVE_FLOAT_H
+#include <float.h> /* for DBL_MAX */
+#endif
+
+#include "gmp-impl.h"
+#include "longlong.h"
+
+#if LIMBS_PER_DOUBLE > 4
+ choke me
+#endif
+
+void
+mpq_set_d (mpq_ptr dest, double d)
+{
+ int negative;
+ mp_exp_t exp;
+ mp_limb_t tp[LIMBS_PER_DOUBLE];
+ mp_ptr np, dp;
+ mp_size_t nn, dn;
+ int c;
+
+ DOUBLE_NAN_INF_ACTION (d,
+ __gmp_invalid_operation (),
+ __gmp_invalid_operation ());
+
+ negative = d < 0;
+ d = ABS (d);
+
+ exp = __gmp_extract_double (tp, d);
+
+ /* There are two main version of the conversion. The `then' arm handles
+ numbers with a fractional part, while the `else' arm handles integers. */
+#if LIMBS_PER_DOUBLE == 4
+ if (exp <= 1 || (exp == 2 && (tp[0] | tp[1]) != 0))
+#endif
+#if LIMBS_PER_DOUBLE == 3
+ if (exp <= 1 || (exp == 2 && tp[0] != 0))
+#endif
+#if LIMBS_PER_DOUBLE == 2
+ if (exp <= 1)
+#endif
+ {
+ if (d == 0.0)
+ {
+ SIZ(NUM(dest)) = 0;
+ SIZ(DEN(dest)) = 1;
+ MPZ_NEWALLOC (DEN(dest), 1)[0] = 1;
+ return;
+ }
+
+#if LIMBS_PER_DOUBLE == 4
+ np = MPZ_NEWALLOC (NUM(dest), 4);
+ if ((tp[0] | tp[1] | tp[2]) == 0)
+ np[0] = tp[3], nn = 1;
+ else if ((tp[0] | tp[1]) == 0)
+ np[1] = tp[3], np[0] = tp[2], nn = 2;
+ else if (tp[0] == 0)
+ np[2] = tp[3], np[1] = tp[2], np[0] = tp[1], nn = 3;
+ else
+ np[3] = tp[3], np[2] = tp[2], np[1] = tp[1], np[0] = tp[0], nn = 4;
+#endif
+#if LIMBS_PER_DOUBLE == 3
+ np = MPZ_NEWALLOC (NUM(dest), 3);
+ if ((tp[0] | tp[1]) == 0)
+ np[0] = tp[2], nn = 1;
+ else if (tp[0] == 0)
+ np[1] = tp[2], np[0] = tp[1], nn = 2;
+ else
+ np[2] = tp[2], np[1] = tp[1], np[0] = tp[0], nn = 3;
+#endif
+#if LIMBS_PER_DOUBLE == 2
+ np = MPZ_NEWALLOC (NUM(dest), 2);
+ if (tp[0] == 0)
+ np[0] = tp[1], nn = 1;
+ else
+ np[1] = tp[1], np[0] = tp[0], nn = 2;
+#endif
+ dn = nn + 1 - exp;
+ ASSERT (dn > 0); /* -exp >= -1; nn >= 1*/
+ dp = MPZ_NEWALLOC (DEN(dest), dn);
+ MPN_ZERO (dp, dn - 1);
+ dp[dn - 1] = 1;
+ count_trailing_zeros (c, np[0] | dp[0]);
+ if (c != 0)
+ {
+ mpn_rshift (np, np, nn, c);
+ nn -= np[nn - 1] == 0;
+ --dn;
+ dp[dn - 1] = CNST_LIMB(1) << (GMP_LIMB_BITS - c);
+ }
+ SIZ(DEN(dest)) = dn;
+ }
+ else
+ {
+ nn = exp;
+ np = MPZ_NEWALLOC (NUM(dest), nn);
+ switch (nn)
+ {
+ default:
+ MPN_ZERO (np, nn - LIMBS_PER_DOUBLE);
+ np += nn - LIMBS_PER_DOUBLE;
+ /* fall through */
+#if LIMBS_PER_DOUBLE == 2
+ case 2:
+ np[1] = tp[1], np[0] = tp[0];
+ break;
+#endif
+#if LIMBS_PER_DOUBLE == 3
+ case 3:
+ np[2] = tp[2], np[1] = tp[1], np[0] = tp[0];
+ break;
+ case 2:
+ np[1] = tp[2], np[0] = tp[1];
+ break;
+#endif
+#if LIMBS_PER_DOUBLE == 4
+ case 4:
+ np[3] = tp[3], np[2] = tp[2], np[1] = tp[1], np[0] = tp[0];
+ break;
+ case 3:
+ np[2] = tp[3], np[1] = tp[2], np[0] = tp[1];
+ break;
+ case 2:
+ np[1] = tp[3], np[0] = tp[2];
+ break;
+#endif
+ }
+ MPZ_NEWALLOC (DEN(dest), 1)[0] = 1;
+ SIZ(DEN(dest)) = 1;
+ }
+ SIZ(NUM(dest)) = negative ? -nn : nn;
+}