From fecd2382e77b89f12c9d630ed4e42e9a54ba6953 Mon Sep 17 00:00:00 2001
From: "K. Richard Pixley" <rich@cygnus>
Date: Thu, 4 Apr 1991 18:19:53 +0000
Subject: Initial revision

---
 gas/flonum.h | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 gas/flonum.h

(limited to 'gas/flonum.h')

diff --git a/gas/flonum.h b/gas/flonum.h
new file mode 100644
index 0000000..570bd3a
--- /dev/null
+++ b/gas/flonum.h
@@ -0,0 +1,122 @@
+/* flonum.h - Floating point package
+   Copyright (C) 1987, 1990, 1991 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* $Id$ */
+
+/***********************************************************************\
+*									*
+*	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!			*
+*									*
+\***********************************************************************/
+#if !defined(__STDC__) && !defined(const)
+#define const /* empty */
+#endif
+
+#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.					*
+*									*
+\***********************************************************************/
+
+#ifdef __STDC__
+
+int atof_generic(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(FLONUM_TYPE *in, FLONUM_TYPE *out);
+void flonum_multip(const FLONUM_TYPE *a, const FLONUM_TYPE *b, FLONUM_TYPE *product);
+
+#else /* __STDC__ */
+
+int atof_generic();
+void flonum_copy();
+void flonum_multip();
+
+#endif /* __STDC__ */
+
+/***********************************************************************\
+*									*
+*	Declare error codes.						*
+*									*
+\***********************************************************************/
+
+#define ERROR_EXPONENT_OVERFLOW (2)
+
+/* end: flonum.h */
-- 
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