308 lines
9.6 KiB
C
308 lines
9.6 KiB
C
/*
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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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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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, kevink@mips.com and Carsten Langgard, carstenl@mips.com
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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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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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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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