Imported gcc-4.4.3

[msp430-gcc.git] / mpfr / init2.c

diff --git a/mpfr/init2.c b/mpfr/init2.c
new file mode 100644 (file)
index 0000000..61120c4
--- /dev/null
+++ b/mpfr/init2.c
@@ -0,0 +1,67 @@
+/* mpfr_init2 -- initialize a floating-point number with given precision
+
+Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR 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 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MPFR 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 MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include "mpfr-impl.h"
+
+void
+mpfr_init2 (mpfr_ptr x, mp_prec_t p)
+{
+  mp_size_t xsize;
+  mp_ptr tmp;
+
+  /* Check if we can represent the number of limbs
+   * associated to the maximum of mpfr_prec_t*/
+  MPFR_ASSERTN( MP_SIZE_T_MAX >= (MPFR_PREC_MAX/BYTES_PER_MP_LIMB) );
+
+  /* Check for correct BITS_PER_MP_LIMB and BYTES_PER_MP_LIMB */
+  MPFR_ASSERTN( BITS_PER_MP_LIMB == BYTES_PER_MP_LIMB * CHAR_BIT
+                && sizeof(mp_limb_t) == BYTES_PER_MP_LIMB );
+
+  /* Check for correct EXP NAN, ZERO & INF in both mpfr.h and in mpfr-impl.h */
+  MPFR_ASSERTN( __MPFR_EXP_NAN  == MPFR_EXP_NAN  );
+  MPFR_ASSERTN( __MPFR_EXP_ZERO == MPFR_EXP_ZERO );
+  MPFR_ASSERTN( __MPFR_EXP_INF  == MPFR_EXP_INF  );
+
+  MPFR_ASSERTN( MPFR_EMAX_MAX <= (MPFR_EXP_MAX >> 1)  );
+  MPFR_ASSERTN( MPFR_EMIN_MIN >= -(MPFR_EXP_MAX >> 1) );
+
+  /* p=1 is not allowed since the rounding to nearest even rule requires at
+     least two bits of mantissa: the neighbours of 3/2 are 1*2^0 and 1*2^1,
+     which both have an odd mantissa */
+  MPFR_ASSERTN(p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX);
+
+  xsize = (mp_size_t) ((p - 1) / BITS_PER_MP_LIMB) + 1;
+  tmp   = (mp_ptr) (*__gmp_allocate_func)(MPFR_MALLOC_SIZE(xsize));
+
+  MPFR_PREC(x) = p;                /* Set prec */
+  MPFR_EXP (x) = MPFR_EXP_INVALID; /* make sure that the exp field has a
+                                      valid value in the C point of view */
+  MPFR_SET_POS(x);                 /* Set a sign */
+  MPFR_SET_MANT_PTR(x, tmp);       /* Set Mantissa ptr */
+  MPFR_SET_ALLOC_SIZE(x, xsize);   /* Fix alloc size of Mantissa */
+  MPFR_SET_NAN(x);                 /* initializes to NaN */
+}
+
+#ifdef MPFR_USE_OWN_MPFR_TMP_ALLOC
+static unsigned char mpfr_stack_tab[8000000];
+unsigned char *mpfr_stack = mpfr_stack_tab;
+#endif