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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
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19990502 sourceware importbinu_ss_19990502
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+/* flonum.h - Floating point package
+
+ Copyright (C) 1987, 90, 91, 92, 94, 95, 1996 Free Software Foundation, Inc.
+
+ This file is part of GAS, the GNU Assembler.
+
+ GAS is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ GAS 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 a copy of the GNU General Public License
+ along with GAS; see the file COPYING. If not, write to the Free
+ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
+
+/***********************************************************************\
+ * *
+ * Arbitrary-precision floating point arithmetic. *
+ * *
+ * *
+ * Notation: a floating point number is expressed as *
+ * MANTISSA * (2 ** EXPONENT). *
+ * *
+ * If this offends more traditional mathematicians, then *
+ * please tell me your nomenclature for flonums! *
+ * *
+ \***********************************************************************/
+
+#include "bignum.h"
+
+/***********************************************************************\
+ * *
+ * Variable precision floating point numbers. *
+ * *
+ * Exponent is the place value of the low littlenum. E.g.: *
+ * If 0: low points to the units littlenum. *
+ * If 1: low points to the LITTLENUM_RADIX littlenum. *
+ * If -1: low points to the 1/LITTLENUM_RADIX littlenum. *
+ * *
+ \***********************************************************************/
+
+/* JF: A sign value of 0 means we have been asked to assemble NaN
+ A sign value of 'P' means we've been asked to assemble +Inf
+ A sign value of 'N' means we've been asked to assemble -Inf
+ */
+struct FLONUM_STRUCT
+{
+ LITTLENUM_TYPE *low; /* low order littlenum of a bignum */
+ LITTLENUM_TYPE *high; /* high order littlenum of a bignum */
+ LITTLENUM_TYPE *leader; /* -> 1st non-zero littlenum */
+ /* If flonum is 0.0, leader==low-1 */
+ long exponent; /* base LITTLENUM_RADIX */
+ char sign; /* '+' or '-' */
+};
+
+typedef struct FLONUM_STRUCT FLONUM_TYPE;
+
+
+/***********************************************************************\
+ * *
+ * Since we can (& do) meet with exponents like 10^5000, it *
+ * is silly to make a table of ~ 10,000 entries, one for each *
+ * power of 10. We keep a table where item [n] is a struct *
+ * FLONUM_FLOATING_POINT representing 10^(2^n). We then *
+ * multiply appropriate entries from this table to get any *
+ * particular power of 10. For the example of 10^5000, a table *
+ * of just 25 entries suffices: 10^(2^-12)...10^(2^+12). *
+ * *
+ \***********************************************************************/
+
+
+extern const FLONUM_TYPE flonum_positive_powers_of_ten[];
+extern const FLONUM_TYPE flonum_negative_powers_of_ten[];
+extern const int table_size_of_flonum_powers_of_ten;
+/* Flonum_XXX_powers_of_ten[] table has */
+/* legal indices from 0 to */
+/* + this number inclusive. */
+
+
+
+/***********************************************************************\
+ * *
+ * Declare worker functions. *
+ * *
+ \***********************************************************************/
+
+int atof_generic PARAMS ((char **address_of_string_pointer,
+ const char *string_of_decimal_marks,
+ const char *string_of_decimal_exponent_marks,
+ FLONUM_TYPE * address_of_generic_floating_point_number));
+
+void flonum_copy PARAMS ((FLONUM_TYPE * in, FLONUM_TYPE * out));
+void flonum_multip PARAMS ((const FLONUM_TYPE * a, const FLONUM_TYPE * b,
+ FLONUM_TYPE * product));
+
+/***********************************************************************\
+ * *
+ * Declare error codes. *
+ * *
+ \***********************************************************************/
+
+#define ERROR_EXPONENT_OVERFLOW (2)
+
+/* end of flonum.h */