| /* 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); |
| 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); |
| 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 */ |
