patch-2.4.6 linux/arch/mips64/math-emu/ieee754.h

• Lines: 491
• Date: Mon Jul 2 13:56:41 2001
• Orig file: v2.4.5/linux/arch/mips64/math-emu/ieee754.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/arch/mips64/math-emu/ieee754.h linux/arch/mips64/math-emu/ieee754.h
@@ -0,0 +1,490 @@
+/* single and double precision fp ops
+ * missing extended precision.
+*/
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.  All rights reserved.
+ * http://www.algor.co.uk
+ *
+ * ########################################################################
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope 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 this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * ########################################################################
+ */
+
+/**************************************************************************
+ *  Nov 7, 2000
+ *  Modification to allow integration with Linux kernel 
+ *
+ *  Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
+ *  Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
+ *************************************************************************/
+
+#ifdef __KERNEL__
+/* Going from Algorithmics to Linux native environment, add this */
+#include <linux/types.h>
+
+/* 
+ * Not very pretty, but the Linux kernel's normal va_list definition 
+ * does not allow it to be used as a structure element, as it is here.
+ */
+#ifndef _STDARG_H
+#include <stdarg.h>
+#endif
+
+#else
+
+/* Note that __KERNEL__ is taken to mean Linux kernel */
+
+#if #system(OpenBSD)
+#include <machine/types.h>
+#endif
+#include <machine/endian.h>
+
+#endif				/* __KERNEL__ */
+
+#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__)
+struct ieee754dp_konst {
+	unsigned mantlo:32;
+	unsigned manthi:20;
+	unsigned bexp:11;
+	unsigned sign:1;
+};
+struct ieee754sp_konst {
+	unsigned mant:23;
+	unsigned bexp:8;
+	unsigned sign:1;
+};
+
+typedef union _ieee754dp {
+	struct ieee754dp_konst oparts;
+	struct {
+		unsigned long long mant:52;
+		unsigned int bexp:11;
+		unsigned int sign:1;
+	} parts;
+	unsigned long long bits;
+	double d;
+} ieee754dp;
+
+typedef union _ieee754sp {
+	struct ieee754sp_konst parts;
+	float f;
+	unsigned long bits;
+} ieee754sp;
+#endif
+
+#if (defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN) || defined(__MIPSEB__)
+struct ieee754dp_konst {
+	unsigned sign:1;
+	unsigned bexp:11;
+	unsigned manthi:20;
+	unsigned mantlo:32;
+};
+typedef union _ieee754dp {
+	struct ieee754dp_konst oparts;
+	struct {
+		unsigned int sign:1;
+		unsigned int bexp:11;
+		unsigned long long mant:52;
+	} parts;
+	double d;
+	unsigned long long bits;
+} ieee754dp;
+
+struct ieee754sp_konst {
+	unsigned sign:1;
+	unsigned bexp:8;
+	unsigned mant:23;
+};
+
+typedef union _ieee754sp {
+	struct ieee754sp_konst parts;
+	float f;
+	unsigned long bits;
+} ieee754sp;
+#endif
+
+/*
+ * single precision (often aka float)
+*/
+int ieee754sp_finite(ieee754sp x);
+int ieee754sp_class(ieee754sp x);
+
+ieee754sp ieee754sp_abs(ieee754sp x);
+ieee754sp ieee754sp_neg(ieee754sp x);
+ieee754sp ieee754sp_scalb(ieee754sp x, int);
+ieee754sp ieee754sp_logb(ieee754sp x);
+
+/* x with sign of y */
+ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y);
+
+ieee754sp ieee754sp_add(ieee754sp x, ieee754sp y);
+ieee754sp ieee754sp_sub(ieee754sp x, ieee754sp y);
+ieee754sp ieee754sp_mul(ieee754sp x, ieee754sp y);
+ieee754sp ieee754sp_div(ieee754sp x, ieee754sp y);
+
+ieee754sp ieee754sp_fint(int x);
+ieee754sp ieee754sp_funs(unsigned x);
+ieee754sp ieee754sp_flong(long long x);
+ieee754sp ieee754sp_fulong(unsigned long long x);
+ieee754sp ieee754sp_fdp(ieee754dp x);
+
+int ieee754sp_tint(ieee754sp x);
+unsigned int ieee754sp_tuns(ieee754sp x);
+long long ieee754sp_tlong(ieee754sp x);
+unsigned long long ieee754sp_tulong(ieee754sp x);
+
+int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cop);
+/*
+ * basic sp math
+ */
+ieee754sp ieee754sp_modf(ieee754sp x, ieee754sp * ip);
+ieee754sp ieee754sp_frexp(ieee754sp x, int *exp);
+ieee754sp ieee754sp_ldexp(ieee754sp x, int exp);
+
+ieee754sp ieee754sp_ceil(ieee754sp x);
+ieee754sp ieee754sp_floor(ieee754sp x);
+ieee754sp ieee754sp_trunc(ieee754sp x);
+
+ieee754sp ieee754sp_sqrt(ieee754sp x);
+
+/*
+ * double precision (often aka double)
+*/
+int ieee754dp_finite(ieee754dp x);
+int ieee754dp_class(ieee754dp x);
+
+/* x with sign of y */
+ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y);
+
+ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y);
+ieee754dp ieee754dp_sub(ieee754dp x, ieee754dp y);
+ieee754dp ieee754dp_mul(ieee754dp x, ieee754dp y);
+ieee754dp ieee754dp_div(ieee754dp x, ieee754dp y);
+
+ieee754dp ieee754dp_abs(ieee754dp x);
+ieee754dp ieee754dp_neg(ieee754dp x);
+ieee754dp ieee754dp_scalb(ieee754dp x, int);
+
+/* return exponent as integer in floating point format 
+ */
+ieee754dp ieee754dp_logb(ieee754dp x);
+
+ieee754dp ieee754dp_fint(int x);
+ieee754dp ieee754dp_funs(unsigned x);
+ieee754dp ieee754dp_flong(long long x);
+ieee754dp ieee754dp_fulong(unsigned long long x);
+ieee754dp ieee754dp_fsp(ieee754sp x);
+
+ieee754dp ieee754dp_ceil(ieee754dp x);
+ieee754dp ieee754dp_floor(ieee754dp x);
+ieee754dp ieee754dp_trunc(ieee754dp x);
+
+int ieee754dp_tint(ieee754dp x);
+unsigned int ieee754dp_tuns(ieee754dp x);
+long long ieee754dp_tlong(ieee754dp x);
+unsigned long long ieee754dp_tulong(ieee754dp x);
+
+int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cop);
+/*
+ * basic sp math
+ */
+ieee754dp ieee754dp_modf(ieee754dp x, ieee754dp * ip);
+ieee754dp ieee754dp_frexp(ieee754dp x, int *exp);
+ieee754dp ieee754dp_ldexp(ieee754dp x, int exp);
+
+ieee754dp ieee754dp_ceil(ieee754dp x);
+ieee754dp ieee754dp_floor(ieee754dp x);
+ieee754dp ieee754dp_trunc(ieee754dp x);
+
+ieee754dp ieee754dp_sqrt(ieee754dp x);
+
+
+
+/* 5 types of floating point number 
+*/
+#define IEEE754_CLASS_NORM	0x00
+#define IEEE754_CLASS_ZERO	0x01
+#define IEEE754_CLASS_DNORM	0x02
+#define IEEE754_CLASS_INF	0x03
+#define IEEE754_CLASS_SNAN	0x04
+#define IEEE754_CLASS_QNAN	0x05
+extern const char *const ieee754_cname[];
+
+/* exception numbers */
+#define IEEE754_INEXACT			0x01
+#define IEEE754_UNDERFLOW		0x02
+#define IEEE754_OVERFLOW		0x04
+#define IEEE754_ZERO_DIVIDE		0x08
+#define IEEE754_INVALID_OPERATION	0x10
+
+/* cmp operators
+*/
+#define IEEE754_CLT	0x01
+#define IEEE754_CEQ	0x02
+#define IEEE754_CGT	0x04
+#define IEEE754_CUN	0x08
+
+/* rounding mode 
+*/
+#define IEEE754_RN	0	/* round to nearest */
+#define IEEE754_RZ	1	/* round toward zero  */
+#define IEEE754_RD	2	/* round toward -Infinity */
+#define IEEE754_RU	3	/* round toward +Infinity */
+
+/* other naming */
+#define IEEE754_RM	IEEE754_RD
+#define IEEE754_RP	IEEE754_RU
+
+/* "normal" comparisons
+*/
+static __inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
+{
+	return ieee754sp_cmp(x, y, IEEE754_CEQ);
+}
+
+static __inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
+{
+	return ieee754sp_cmp(x, y,
+			     IEEE754_CLT | IEEE754_CGT | IEEE754_CUN);
+}
+
+static __inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
+{
+	return ieee754sp_cmp(x, y, IEEE754_CLT);
+}
+
+static __inline int ieee754sp_le(ieee754sp x, ieee754sp y)
+{
+	return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ);
+}
+
+static __inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
+{
+	return ieee754sp_cmp(x, y, IEEE754_CGT);
+}
+
+
+static __inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
+{
+	return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ);
+}
+
+static __inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
+{
+	return ieee754dp_cmp(x, y, IEEE754_CEQ);
+}
+
+static __inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
+{
+	return ieee754dp_cmp(x, y,
+			     IEEE754_CLT | IEEE754_CGT | IEEE754_CUN);
+}
+
+static __inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
+{
+	return ieee754dp_cmp(x, y, IEEE754_CLT);
+}
+
+static __inline int ieee754dp_le(ieee754dp x, ieee754dp y)
+{
+	return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ);
+}
+
+static __inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
+{
+	return ieee754dp_cmp(x, y, IEEE754_CGT);
+}
+
+static __inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
+{
+	return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ);
+}
+
+
+/* like strtod
+*/
+ieee754dp ieee754dp_fstr(const char *s, char **endp);
+char *ieee754dp_tstr(ieee754dp x, int prec, int fmt, int af);
+
+
+/* the control status register 
+*/
+struct ieee754_csr {
+	unsigned pad:13;
+	unsigned noq:1;		/* set 1 for no quiet NaN's */
+	unsigned nod:1;		/* set 1 for no denormalised numbers */
+	unsigned cx:5;		/* exceptions this operation */
+	unsigned mx:5;		/* exception enable  mask */
+	unsigned sx:5;		/* exceptions total */
+	unsigned rm:2;		/* current rounding mode */
+};
+extern struct ieee754_csr ieee754_csr;
+
+static __inline unsigned ieee754_getrm(void)
+{
+	return (ieee754_csr.rm);
+}
+static __inline unsigned ieee754_setrm(unsigned rm)
+{
+	return (ieee754_csr.rm = rm);
+}
+
+/*
+ * get current exceptions
+ */
+static __inline unsigned ieee754_getcx(void)
+{
+	return (ieee754_csr.cx);
+}
+
+/* test for current exception condition 
+ */
+static __inline int ieee754_cxtest(unsigned n)
+{
+	return (ieee754_csr.cx & n);
+}
+
+/*
+ * get sticky exceptions
+ */
+static __inline unsigned ieee754_getsx(void)
+{
+	return (ieee754_csr.sx);
+}
+
+/* clear sticky conditions
+*/
+static __inline unsigned ieee754_clrsx(void)
+{
+	return (ieee754_csr.sx = 0);
+}
+
+/* test for sticky exception condition 
+ */
+static __inline int ieee754_sxtest(unsigned n)
+{
+	return (ieee754_csr.sx & n);
+}
+
+/* debugging */
+ieee754sp ieee754sp_dump(char *s, ieee754sp x);
+ieee754dp ieee754dp_dump(char *s, ieee754dp x);
+
+#define IEEE754_SPCVAL_PZERO	0
+#define IEEE754_SPCVAL_NZERO	1
+#define IEEE754_SPCVAL_PONE	2
+#define IEEE754_SPCVAL_NONE	3
+#define IEEE754_SPCVAL_PTEN	4
+#define IEEE754_SPCVAL_NTEN	5
+#define IEEE754_SPCVAL_PINFINITY	6
+#define IEEE754_SPCVAL_NINFINITY	7
+#define IEEE754_SPCVAL_INDEF	8
+#define IEEE754_SPCVAL_PMAX	9	/* +max norm */
+#define IEEE754_SPCVAL_NMAX	10	/* -max norm */
+#define IEEE754_SPCVAL_PMIN	11	/* +min norm */
+#define IEEE754_SPCVAL_NMIN	12	/* +min norm */
+#define IEEE754_SPCVAL_PMIND	13	/* +min denorm */
+#define IEEE754_SPCVAL_NMIND	14	/* +min denorm */
+#define IEEE754_SPCVAL_P1E31	15	/* + 1.0e31 */
+#define IEEE754_SPCVAL_P1E63	16	/* + 1.0e63 */
+
+extern const struct ieee754dp_konst __ieee754dp_spcvals[];
+extern const struct ieee754sp_konst __ieee754sp_spcvals[];
+#define ieee754dp_spcvals ((const ieee754dp *)__ieee754dp_spcvals)
+#define ieee754sp_spcvals ((const ieee754sp *)__ieee754sp_spcvals)
+
+/* return infinity with given sign
+*/
+#define ieee754dp_inf(sn)	\
+  (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
+#define ieee754dp_zero(sn) \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
+#define ieee754dp_one(sn) \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
+#define ieee754dp_ten(sn) \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
+#define ieee754dp_indef() \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
+#define ieee754dp_max(sn) \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
+#define ieee754dp_min(sn) \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
+#define ieee754dp_mind(sn) \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
+#define ieee754dp_1e31() \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
+#define ieee754dp_1e63() \
+  (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
+
+#define ieee754sp_inf(sn) \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
+#define ieee754sp_zero(sn) \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
+#define ieee754sp_one(sn) \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
+#define ieee754sp_ten(sn) \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
+#define ieee754sp_indef() \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
+#define ieee754sp_max(sn) \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
+#define ieee754sp_min(sn) \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
+#define ieee754sp_mind(sn) \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
+#define ieee754sp_1e31() \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
+#define ieee754sp_1e63() \
+  (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
+
+/* indefinite integer value 
+*/
+#define ieee754si_indef()	INT_MIN
+#ifdef LONG_LONG_MIN
+#define ieee754di_indef()	LONG_LONG_MIN
+#else
+#define ieee754di_indef()	(-9223372036854775807LL-1)
+#endif
+
+/* IEEE exception context, passed to handler */
+struct ieee754xctx {
+	const char *op;		/* operation name */
+	int rt;			/* result type */
+	union {
+		ieee754sp sp;	/* single precision */
+		ieee754dp dp;	/* double precision */
+#ifdef IEEE854_XP
+		ieee754xp xp;	/* extended precision */
+#endif
+		int si;		/* standard signed integer (32bits) */
+		long long di;	/* extended signed integer (64bits) */
+	} rv;			/* default result format implied by op */
+	va_list ap;
+};
+
+/* result types for xctx.rt */
+#define IEEE754_RT_SP	0
+#define IEEE754_RT_DP	1
+#define IEEE754_RT_XP	2
+#define IEEE754_RT_SI	3
+#define IEEE754_RT_DI	4
+
+extern void ieee754_xcpt(struct ieee754xctx *xcp);
+
+/* compat */
+#define ieee754dp_fix(x)	ieee754dp_tint(x)
+#define ieee754sp_fix(x)	ieee754sp_tint(x)