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311 lines
9.8 KiB
311 lines
9.8 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* MIPS floating point support |
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* Copyright (C) 1994-2000 Algorithmics Ltd. |
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* |
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* Nov 7, 2000 |
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* Modification to allow integration with Linux kernel |
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* |
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* Kevin D. Kissell, [email protected] and Carsten Langgard, [email protected] |
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* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. |
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*/ |
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#ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H |
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#define __ARCH_MIPS_MATH_EMU_IEEE754_H |
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#include <linux/compiler.h> |
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#include <asm/byteorder.h> |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/sched.h> |
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#include <asm/bitfield.h> |
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union ieee754dp { |
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struct { |
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__BITFIELD_FIELD(unsigned int sign:1, |
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__BITFIELD_FIELD(unsigned int bexp:11, |
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__BITFIELD_FIELD(u64 mant:52, |
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;))) |
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}; |
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u64 bits; |
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}; |
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union ieee754sp { |
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struct { |
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__BITFIELD_FIELD(unsigned sign:1, |
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__BITFIELD_FIELD(unsigned bexp:8, |
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__BITFIELD_FIELD(unsigned mant:23, |
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;))) |
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}; |
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u32 bits; |
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}; |
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/* |
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* single precision (often aka float) |
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*/ |
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int ieee754sp_class(union ieee754sp x); |
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union ieee754sp ieee754sp_abs(union ieee754sp x); |
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union ieee754sp ieee754sp_neg(union ieee754sp x); |
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union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y); |
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union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y); |
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union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y); |
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union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y); |
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union ieee754sp ieee754sp_fint(int x); |
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union ieee754sp ieee754sp_flong(s64 x); |
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union ieee754sp ieee754sp_fdp(union ieee754dp x); |
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union ieee754sp ieee754sp_rint(union ieee754sp x); |
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int ieee754sp_tint(union ieee754sp x); |
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s64 ieee754sp_tlong(union ieee754sp x); |
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int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig); |
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union ieee754sp ieee754sp_sqrt(union ieee754sp x); |
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union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, |
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union ieee754sp y); |
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union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x, |
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union ieee754sp y); |
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union ieee754sp ieee754sp_madd(union ieee754sp z, union ieee754sp x, |
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union ieee754sp y); |
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union ieee754sp ieee754sp_msub(union ieee754sp z, union ieee754sp x, |
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union ieee754sp y); |
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union ieee754sp ieee754sp_nmadd(union ieee754sp z, union ieee754sp x, |
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union ieee754sp y); |
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union ieee754sp ieee754sp_nmsub(union ieee754sp z, union ieee754sp x, |
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union ieee754sp y); |
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int ieee754sp_2008class(union ieee754sp x); |
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union ieee754sp ieee754sp_fmin(union ieee754sp x, union ieee754sp y); |
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union ieee754sp ieee754sp_fmina(union ieee754sp x, union ieee754sp y); |
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union ieee754sp ieee754sp_fmax(union ieee754sp x, union ieee754sp y); |
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union ieee754sp ieee754sp_fmaxa(union ieee754sp x, union ieee754sp y); |
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/* |
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* double precision (often aka double) |
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*/ |
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int ieee754dp_class(union ieee754dp x); |
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union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y); |
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union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y); |
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union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y); |
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union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y); |
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union ieee754dp ieee754dp_abs(union ieee754dp x); |
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union ieee754dp ieee754dp_neg(union ieee754dp x); |
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union ieee754dp ieee754dp_fint(int x); |
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union ieee754dp ieee754dp_flong(s64 x); |
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union ieee754dp ieee754dp_fsp(union ieee754sp x); |
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union ieee754dp ieee754dp_rint(union ieee754dp x); |
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int ieee754dp_tint(union ieee754dp x); |
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s64 ieee754dp_tlong(union ieee754dp x); |
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int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig); |
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union ieee754dp ieee754dp_sqrt(union ieee754dp x); |
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union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, |
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union ieee754dp y); |
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union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x, |
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union ieee754dp y); |
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union ieee754dp ieee754dp_madd(union ieee754dp z, union ieee754dp x, |
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union ieee754dp y); |
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union ieee754dp ieee754dp_msub(union ieee754dp z, union ieee754dp x, |
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union ieee754dp y); |
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union ieee754dp ieee754dp_nmadd(union ieee754dp z, union ieee754dp x, |
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union ieee754dp y); |
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union ieee754dp ieee754dp_nmsub(union ieee754dp z, union ieee754dp x, |
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union ieee754dp y); |
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int ieee754dp_2008class(union ieee754dp x); |
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union ieee754dp ieee754dp_fmin(union ieee754dp x, union ieee754dp y); |
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union ieee754dp ieee754dp_fmina(union ieee754dp x, union ieee754dp y); |
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union ieee754dp ieee754dp_fmax(union ieee754dp x, union ieee754dp y); |
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union ieee754dp ieee754dp_fmaxa(union ieee754dp x, union ieee754dp y); |
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/* 5 types of floating point number |
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*/ |
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enum { |
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IEEE754_CLASS_NORM = 0x00, |
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IEEE754_CLASS_ZERO = 0x01, |
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IEEE754_CLASS_DNORM = 0x02, |
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IEEE754_CLASS_INF = 0x03, |
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IEEE754_CLASS_SNAN = 0x04, |
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IEEE754_CLASS_QNAN = 0x05, |
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}; |
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/* exception numbers */ |
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#define IEEE754_INEXACT 0x01 |
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#define IEEE754_UNDERFLOW 0x02 |
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#define IEEE754_OVERFLOW 0x04 |
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#define IEEE754_ZERO_DIVIDE 0x08 |
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#define IEEE754_INVALID_OPERATION 0x10 |
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/* cmp operators |
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*/ |
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#define IEEE754_CLT 0x01 |
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#define IEEE754_CEQ 0x02 |
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#define IEEE754_CGT 0x04 |
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#define IEEE754_CUN 0x08 |
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/* |
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* The control status register |
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*/ |
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struct _ieee754_csr { |
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__BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */ |
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__BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */ |
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__BITFIELD_FIELD(unsigned c:1, /* condition[0] */ |
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__BITFIELD_FIELD(unsigned pad0:3, |
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__BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */ |
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__BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */ |
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__BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */ |
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__BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */ |
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__BITFIELD_FIELD(unsigned sx:5, /* exceptions total */ |
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__BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */ |
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;)))))))))) |
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}; |
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#define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) |
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static inline unsigned int ieee754_getrm(void) |
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{ |
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return (ieee754_csr.rm); |
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} |
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static inline unsigned int ieee754_setrm(unsigned int rm) |
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{ |
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return (ieee754_csr.rm = rm); |
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} |
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/* |
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* get current exceptions |
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*/ |
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static inline unsigned int ieee754_getcx(void) |
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{ |
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return (ieee754_csr.cx); |
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} |
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/* test for current exception condition |
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*/ |
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static inline int ieee754_cxtest(unsigned int n) |
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{ |
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return (ieee754_csr.cx & n); |
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} |
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/* |
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* get sticky exceptions |
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*/ |
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static inline unsigned int ieee754_getsx(void) |
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{ |
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return (ieee754_csr.sx); |
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} |
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/* clear sticky conditions |
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*/ |
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static inline unsigned int ieee754_clrsx(void) |
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{ |
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return (ieee754_csr.sx = 0); |
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} |
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/* test for sticky exception condition |
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*/ |
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static inline int ieee754_sxtest(unsigned int n) |
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{ |
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return (ieee754_csr.sx & n); |
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} |
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/* debugging */ |
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union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); |
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union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); |
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#define IEEE754_SPCVAL_PZERO 0 /* +0.0 */ |
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#define IEEE754_SPCVAL_NZERO 1 /* -0.0 */ |
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#define IEEE754_SPCVAL_PONE 2 /* +1.0 */ |
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#define IEEE754_SPCVAL_NONE 3 /* -1.0 */ |
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#define IEEE754_SPCVAL_PTEN 4 /* +10.0 */ |
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#define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ |
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#define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ |
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#define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ |
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#define IEEE754_SPCVAL_INDEF_LEG 8 /* legacy quiet NaN */ |
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#define IEEE754_SPCVAL_INDEF_2008 9 /* IEEE 754-2008 quiet NaN */ |
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#define IEEE754_SPCVAL_PMAX 10 /* +max norm */ |
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#define IEEE754_SPCVAL_NMAX 11 /* -max norm */ |
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#define IEEE754_SPCVAL_PMIN 12 /* +min norm */ |
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#define IEEE754_SPCVAL_NMIN 13 /* -min norm */ |
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#define IEEE754_SPCVAL_PMIND 14 /* +min denorm */ |
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#define IEEE754_SPCVAL_NMIND 15 /* -min denorm */ |
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#define IEEE754_SPCVAL_P1E31 16 /* + 1.0e31 */ |
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#define IEEE754_SPCVAL_P1E63 17 /* + 1.0e63 */ |
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extern const union ieee754dp __ieee754dp_spcvals[]; |
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extern const union ieee754sp __ieee754sp_spcvals[]; |
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#define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals) |
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#define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals) |
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/* |
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* Return infinity with given sign |
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*/ |
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#define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) |
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#define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) |
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#define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) |
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#define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) |
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#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ |
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ieee754_csr.nan2008]) |
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#define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) |
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#define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) |
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#define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) |
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#define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31]) |
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#define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63]) |
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#define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) |
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#define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) |
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#define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) |
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#define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) |
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#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ |
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ieee754_csr.nan2008]) |
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#define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) |
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#define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) |
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#define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) |
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#define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31]) |
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#define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63]) |
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/* |
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* Indefinite integer value |
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*/ |
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static inline int ieee754si_indef(void) |
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{ |
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return ieee754_csr.nan2008 ? 0 : INT_MAX; |
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} |
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static inline s64 ieee754di_indef(void) |
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{ |
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return ieee754_csr.nan2008 ? 0 : S64_MAX; |
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} |
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/* |
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* Overflow integer value |
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*/ |
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static inline int ieee754si_overflow(int xs) |
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{ |
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return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX; |
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} |
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static inline s64 ieee754di_overflow(int xs) |
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{ |
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return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX; |
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} |
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/* result types for xctx.rt */ |
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#define IEEE754_RT_SP 0 |
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#define IEEE754_RT_DP 1 |
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#define IEEE754_RT_XP 2 |
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#define IEEE754_RT_SI 3 |
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#define IEEE754_RT_DI 4 |
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/* compat */ |
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#define ieee754dp_fix(x) ieee754dp_tint(x) |
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#define ieee754sp_fix(x) ieee754sp_tint(x) |
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#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */
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