Imported gcc-4.4.3

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

diff --git a/gmp/mpz/set_d.c b/gmp/mpz/set_d.c
new file mode 100644 (file)
index 0000000..2e7fce1
--- /dev/null
+++ b/gmp/mpz/set_d.c
@@ -0,0 +1,107 @@
+/* mpz_set_d(integer, val) -- Assign INTEGER with a double value VAL.
+
+Copyright 1995, 1996, 2000, 2001, 2002, 2003, 2006 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"
+
+
+/* We used to have a special case for d < MP_BASE_AS_DOUBLE, just casting
+   double -> limb.  Unfortunately gcc 3.3 on powerpc970-apple-darwin6.8.5
+   got this wrong.  (It assumed __fixunsdfdi returned its result in a single
+   64-bit register, where instead that function followed the calling
+   conventions and gave the result in two parts r3 and r4.)  Hence the use
+   of __gmp_extract_double in all cases.  */
+
+void
+mpz_set_d (mpz_ptr r, double d)
+{
+  int negative;
+  mp_limb_t tp[LIMBS_PER_DOUBLE];
+  mp_ptr rp;
+  mp_size_t rn;
+
+  DOUBLE_NAN_INF_ACTION (d,
+                         __gmp_invalid_operation (),
+                         __gmp_invalid_operation ());
+
+  negative = d < 0;
+  d = ABS (d);
+
+  rn = __gmp_extract_double (tp, d);
+
+  if (ALLOC(r) < rn)
+    _mpz_realloc (r, rn);
+
+  if (rn <= 0)
+    rn = 0;
+
+  rp = PTR (r);
+
+  switch (rn)
+    {
+    default:
+      MPN_ZERO (rp, rn - LIMBS_PER_DOUBLE);
+      rp += rn - LIMBS_PER_DOUBLE;
+      /* fall through */
+#if LIMBS_PER_DOUBLE == 2
+    case 2:
+      rp[1] = tp[1], rp[0] = tp[0];
+      break;
+    case 1:
+      rp[0] = tp[1];
+      break;
+#endif
+#if LIMBS_PER_DOUBLE == 3
+    case 3:
+      rp[2] = tp[2], rp[1] = tp[1], rp[0] = tp[0];
+      break;
+    case 2:
+      rp[1] = tp[2], rp[0] = tp[1];
+      break;
+    case 1:
+      rp[0] = tp[2];
+      break;
+#endif
+#if LIMBS_PER_DOUBLE == 4
+    case 4:
+      rp[3] = tp[3], rp[2] = tp[2], rp[1] = tp[1], rp[0] = tp[0];
+      break;
+    case 3:
+      rp[2] = tp[3], rp[1] = tp[2], rp[0] = tp[1];
+      break;
+    case 2:
+      rp[1] = tp[3], rp[0] = tp[2];
+      break;
+    case 1:
+      rp[0] = tp[3];
+      break;
+#endif
+    case 0:
+      break;
+    }
+
+  SIZ(r) = negative ? -rn : rn;
+}