/* * MIPS floating point support * Copyright (C) 1994-2000 Algorithmics Ltd. * 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. */ #ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H #define __ARCH_MIPS_MATH_EMU_IEEE754_H #include <asm/byteorder.h> #include <linux/types.h> #include <linux/sched.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 #ifdef __LITTLE_ENDIAN 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 { u64 mant:52; unsigned int bexp:11; unsigned int sign:1; } parts; u64 bits; double d; } ieee754dp; typedef union _ieee754sp { struct ieee754sp_konst parts; float f; u32 bits; } ieee754sp; #endif #ifdef __BIG_ENDIAN 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; u64 mant:52; } parts; double d; u64 bits; } ieee754dp; struct ieee754sp_konst { unsigned sign:1; unsigned bexp:8; unsigned mant:23; }; typedef union _ieee754sp { struct ieee754sp_konst parts; float f; u32 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(s64 x); ieee754sp ieee754sp_fulong(u64 x); ieee754sp ieee754sp_fdp(ieee754dp x); int ieee754sp_tint(ieee754sp x); unsigned int ieee754sp_tuns(ieee754sp x); s64 ieee754sp_tlong(ieee754sp x); u64 ieee754sp_tulong(ieee754sp x); int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cop, int sig); /* * 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(s64 x); ieee754dp ieee754dp_fulong(u64 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); s64 ieee754dp_tlong(ieee754dp x); u64 ieee754dp_tulong(ieee754dp x); int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cop, int sig); /* * 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 /* 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, 0); } static inline int ieee754sp_ne(ieee754sp x, ieee754sp y) { return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0); } static inline int ieee754sp_lt(ieee754sp x, ieee754sp y) { return ieee754sp_cmp(x, y, IEEE754_CLT, 0); } static inline int ieee754sp_le(ieee754sp x, ieee754sp y) { return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0); } static inline int ieee754sp_gt(ieee754sp x, ieee754sp y) { return ieee754sp_cmp(x, y, IEEE754_CGT, 0); } static inline int ieee754sp_ge(ieee754sp x, ieee754sp y) { return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0); } static inline int ieee754dp_eq(ieee754dp x, ieee754dp y) { return ieee754dp_cmp(x, y, IEEE754_CEQ, 0); } static inline int ieee754dp_ne(ieee754dp x, ieee754dp y) { return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0); } static inline int ieee754dp_lt(ieee754dp x, ieee754dp y) { return ieee754dp_cmp(x, y, IEEE754_CLT, 0); } static inline int ieee754dp_le(ieee754dp x, ieee754dp y) { return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0); } static inline int ieee754dp_gt(ieee754dp x, ieee754dp y) { return ieee754dp_cmp(x, y, IEEE754_CGT, 0); } static inline int ieee754dp_ge(ieee754dp x, ieee754dp y) { return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0); } /* * 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 { #ifdef __BIG_ENDIAN unsigned pad0:7; unsigned nod:1; /* set 1 for no denormalised numbers */ unsigned c:1; /* condition */ unsigned pad1:5; unsigned cx:6; /* exceptions this operation */ unsigned mx:5; /* exception enable mask */ unsigned sx:5; /* exceptions total */ unsigned rm:2; /* current rounding mode */ #endif #ifdef __LITTLE_ENDIAN unsigned rm:2; /* current rounding mode */ unsigned sx:5; /* exceptions total */ unsigned mx:5; /* exception enable mask */ unsigned cx:6; /* exceptions this operation */ unsigned pad1:5; unsigned c:1; /* condition */ unsigned nod:1; /* set 1 for no denormalised numbers */ unsigned pad0:7; #endif }; #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) 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_MAX #ifdef LONG_LONG_MAX #define ieee754di_indef() LONG_LONG_MAX #else #define ieee754di_indef() ((s64)(~0ULL>>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) */ s64 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) #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */