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Diffstat (limited to 'arch/mips/math-emu/ieee754.h')
| -rw-r--r-- | arch/mips/math-emu/ieee754.h | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/arch/mips/math-emu/ieee754.h b/arch/mips/math-emu/ieee754.h new file mode 100644 index 0000000000..090caa740b --- /dev/null +++ b/arch/mips/math-emu/ieee754.h @@ -0,0 +1,311 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * MIPS floating point support + * Copyright (C) 1994-2000 Algorithmics Ltd. + * + * 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 <linux/compiler.h> +#include <asm/byteorder.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <asm/bitfield.h> + +union ieee754dp { + struct { + __BITFIELD_FIELD(unsigned int sign:1, + __BITFIELD_FIELD(unsigned int bexp:11, + __BITFIELD_FIELD(u64 mant:52, + ;))) + }; + u64 bits; +}; + +union ieee754sp { + struct { + __BITFIELD_FIELD(unsigned sign:1, + __BITFIELD_FIELD(unsigned bexp:8, + __BITFIELD_FIELD(unsigned mant:23, + ;))) + }; + u32 bits; +}; + +/* + * single precision (often aka float) +*/ +int ieee754sp_class(union ieee754sp x); + +union ieee754sp ieee754sp_abs(union ieee754sp x); +union ieee754sp ieee754sp_neg(union ieee754sp x); + +union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y); +union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y); +union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y); +union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y); + +union ieee754sp ieee754sp_fint(int x); +union ieee754sp ieee754sp_flong(s64 x); +union ieee754sp ieee754sp_fdp(union ieee754dp x); +union ieee754sp ieee754sp_rint(union ieee754sp x); + +int ieee754sp_tint(union ieee754sp x); +s64 ieee754sp_tlong(union ieee754sp x); + +int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig); + +union ieee754sp ieee754sp_sqrt(union ieee754sp x); + +union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, + union ieee754sp y); +union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x, + union ieee754sp y); +union ieee754sp ieee754sp_madd(union ieee754sp z, union ieee754sp x, + union ieee754sp y); +union ieee754sp ieee754sp_msub(union ieee754sp z, union ieee754sp x, + union ieee754sp y); +union ieee754sp ieee754sp_nmadd(union ieee754sp z, union ieee754sp x, + union ieee754sp y); +union ieee754sp ieee754sp_nmsub(union ieee754sp z, union ieee754sp x, + union ieee754sp y); +int ieee754sp_2008class(union ieee754sp x); +union ieee754sp ieee754sp_fmin(union ieee754sp x, union ieee754sp y); +union ieee754sp ieee754sp_fmina(union ieee754sp x, union ieee754sp y); +union ieee754sp ieee754sp_fmax(union ieee754sp x, union ieee754sp y); +union ieee754sp ieee754sp_fmaxa(union ieee754sp x, union ieee754sp y); + +/* + * double precision (often aka double) +*/ +int ieee754dp_class(union ieee754dp x); + +union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y); +union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y); +union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y); +union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y); + +union ieee754dp ieee754dp_abs(union ieee754dp x); +union ieee754dp ieee754dp_neg(union ieee754dp x); + +union ieee754dp ieee754dp_fint(int x); +union ieee754dp ieee754dp_flong(s64 x); +union ieee754dp ieee754dp_fsp(union ieee754sp x); +union ieee754dp ieee754dp_rint(union ieee754dp x); + +int ieee754dp_tint(union ieee754dp x); +s64 ieee754dp_tlong(union ieee754dp x); + +int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig); + +union ieee754dp ieee754dp_sqrt(union ieee754dp x); + +union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, + union ieee754dp y); +union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x, + union ieee754dp y); +union ieee754dp ieee754dp_madd(union ieee754dp z, union ieee754dp x, + union ieee754dp y); +union ieee754dp ieee754dp_msub(union ieee754dp z, union ieee754dp x, + union ieee754dp y); +union ieee754dp ieee754dp_nmadd(union ieee754dp z, union ieee754dp x, + union ieee754dp y); +union ieee754dp ieee754dp_nmsub(union ieee754dp z, union ieee754dp x, + union ieee754dp y); +int ieee754dp_2008class(union ieee754dp x); +union ieee754dp ieee754dp_fmin(union ieee754dp x, union ieee754dp y); +union ieee754dp ieee754dp_fmina(union ieee754dp x, union ieee754dp y); +union ieee754dp ieee754dp_fmax(union ieee754dp x, union ieee754dp y); +union ieee754dp ieee754dp_fmaxa(union ieee754dp x, union ieee754dp y); + + +/* 5 types of floating point number +*/ +enum { + IEEE754_CLASS_NORM = 0x00, + IEEE754_CLASS_ZERO = 0x01, + IEEE754_CLASS_DNORM = 0x02, + IEEE754_CLASS_INF = 0x03, + IEEE754_CLASS_SNAN = 0x04, + 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 + +/* + * The control status register + */ +struct _ieee754_csr { + __BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */ + __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */ + __BITFIELD_FIELD(unsigned c:1, /* condition[0] */ + __BITFIELD_FIELD(unsigned pad0:3, + __BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */ + __BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */ + __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */ + __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */ + __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */ + __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */ + ;)))))))))) +}; +#define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) + +static inline unsigned int ieee754_getrm(void) +{ + return (ieee754_csr.rm); +} + +static inline unsigned int ieee754_setrm(unsigned int rm) +{ + return (ieee754_csr.rm = rm); +} + +/* + * get current exceptions + */ +static inline unsigned int ieee754_getcx(void) +{ + return (ieee754_csr.cx); +} + +/* test for current exception condition + */ +static inline int ieee754_cxtest(unsigned int n) +{ + return (ieee754_csr.cx & n); +} + +/* + * get sticky exceptions + */ +static inline unsigned int ieee754_getsx(void) +{ + return (ieee754_csr.sx); +} + +/* clear sticky conditions +*/ +static inline unsigned int ieee754_clrsx(void) +{ + return (ieee754_csr.sx = 0); +} + +/* test for sticky exception condition + */ +static inline int ieee754_sxtest(unsigned int n) +{ + return (ieee754_csr.sx & n); +} + +/* debugging */ +union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); +union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); + +#define IEEE754_SPCVAL_PZERO 0 /* +0.0 */ +#define IEEE754_SPCVAL_NZERO 1 /* -0.0 */ +#define IEEE754_SPCVAL_PONE 2 /* +1.0 */ +#define IEEE754_SPCVAL_NONE 3 /* -1.0 */ +#define IEEE754_SPCVAL_PTEN 4 /* +10.0 */ +#define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ +#define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ +#define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ +#define IEEE754_SPCVAL_INDEF_LEG 8 /* legacy quiet NaN */ +#define IEEE754_SPCVAL_INDEF_2008 9 /* IEEE 754-2008 quiet NaN */ +#define IEEE754_SPCVAL_PMAX 10 /* +max norm */ +#define IEEE754_SPCVAL_NMAX 11 /* -max norm */ +#define IEEE754_SPCVAL_PMIN 12 /* +min norm */ +#define IEEE754_SPCVAL_NMIN 13 /* -min norm */ +#define IEEE754_SPCVAL_PMIND 14 /* +min denorm */ +#define IEEE754_SPCVAL_NMIND 15 /* -min denorm */ +#define IEEE754_SPCVAL_P1E31 16 /* + 1.0e31 */ +#define IEEE754_SPCVAL_P1E63 17 /* + 1.0e63 */ + +extern const union ieee754dp __ieee754dp_spcvals[]; +extern const union ieee754sp __ieee754sp_spcvals[]; +#define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals) +#define ieee754sp_spcvals ((const union 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_LEG + \ + ieee754_csr.nan2008]) +#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_LEG + \ + ieee754_csr.nan2008]) +#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 + */ +static inline int ieee754si_indef(void) +{ + return ieee754_csr.nan2008 ? 0 : INT_MAX; +} + +static inline s64 ieee754di_indef(void) +{ + return ieee754_csr.nan2008 ? 0 : S64_MAX; +} + +/* + * Overflow integer value + */ +static inline int ieee754si_overflow(int xs) +{ + return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX; +} + +static inline s64 ieee754di_overflow(int xs) +{ + return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX; +} + +/* 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 + +/* compat */ +#define ieee754dp_fix(x) ieee754dp_tint(x) +#define ieee754sp_fix(x) ieee754sp_tint(x) + +#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */ |