19990502 sourceware importbinu_ss_19990502

1 files changed, 110 insertions, 0 deletions

diff --git a/gas/flonum.h b/gas/flonum.h
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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 */