ieee754d.c
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上传日期:2013-04-10
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- /*
- * Some debug functions
- *
- * MIPS floating point support
- *
- * Copyright (C) 1994-2000 Algorithmics Ltd. All rights reserved.
- * 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
- * Modified to build and operate in Linux kernel environment.
- *
- * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
- * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
- */
- #include <linux/kernel.h>
- #include "ieee754.h"
- #define DP_EBIAS 1023
- #define DP_EMIN (-1022)
- #define DP_EMAX 1023
- #define DP_FBITS 52
- #define SP_EBIAS 127
- #define SP_EMIN (-126)
- #define SP_EMAX 127
- #define SP_FBITS 23
- #define DP_MBIT(x) ((u64)1 << (x))
- #define DP_HIDDEN_BIT DP_MBIT(DP_FBITS)
- #define DP_SIGN_BIT DP_MBIT(63)
- #define SP_MBIT(x) ((u32)1 << (x))
- #define SP_HIDDEN_BIT SP_MBIT(SP_FBITS)
- #define SP_SIGN_BIT SP_MBIT(31)
- #define SPSIGN(sp) (sp.parts.sign)
- #define SPBEXP(sp) (sp.parts.bexp)
- #define SPMANT(sp) (sp.parts.mant)
- #define DPSIGN(dp) (dp.parts.sign)
- #define DPBEXP(dp) (dp.parts.bexp)
- #define DPMANT(dp) (dp.parts.mant)
- ieee754dp ieee754dp_dump(char *m, ieee754dp x)
- {
- int i;
- printk("%s", m);
- printk("<%08x,%08x>n", (unsigned) (x.bits >> 32),
- (unsigned) x.bits);
- printk("t=");
- switch (ieee754dp_class(x)) {
- case IEEE754_CLASS_QNAN:
- case IEEE754_CLASS_SNAN:
- printk("Nan %c", DPSIGN(x) ? '-' : '+');
- for (i = DP_FBITS - 1; i >= 0; i--)
- printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
- break;
- case IEEE754_CLASS_INF:
- printk("%cInfinity", DPSIGN(x) ? '-' : '+');
- break;
- case IEEE754_CLASS_ZERO:
- printk("%cZero", DPSIGN(x) ? '-' : '+');
- break;
- case IEEE754_CLASS_DNORM:
- printk("%c0.", DPSIGN(x) ? '-' : '+');
- for (i = DP_FBITS - 1; i >= 0; i--)
- printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
- printk("e%d", DPBEXP(x) - DP_EBIAS);
- break;
- case IEEE754_CLASS_NORM:
- printk("%c1.", DPSIGN(x) ? '-' : '+');
- for (i = DP_FBITS - 1; i >= 0; i--)
- printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
- printk("e%d", DPBEXP(x) - DP_EBIAS);
- break;
- default:
- printk("Illegal/Unknown IEEE754 value class");
- }
- printk("n");
- return x;
- }
- ieee754sp ieee754sp_dump(char *m, ieee754sp x)
- {
- int i;
- printk("%s=", m);
- printk("<%08x>n", (unsigned) x.bits);
- printk("t=");
- switch (ieee754sp_class(x)) {
- case IEEE754_CLASS_QNAN:
- case IEEE754_CLASS_SNAN:
- printk("Nan %c", SPSIGN(x) ? '-' : '+');
- for (i = SP_FBITS - 1; i >= 0; i--)
- printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
- break;
- case IEEE754_CLASS_INF:
- printk("%cInfinity", SPSIGN(x) ? '-' : '+');
- break;
- case IEEE754_CLASS_ZERO:
- printk("%cZero", SPSIGN(x) ? '-' : '+');
- break;
- case IEEE754_CLASS_DNORM:
- printk("%c0.", SPSIGN(x) ? '-' : '+');
- for (i = SP_FBITS - 1; i >= 0; i--)
- printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
- printk("e%d", SPBEXP(x) - SP_EBIAS);
- break;
- case IEEE754_CLASS_NORM:
- printk("%c1.", SPSIGN(x) ? '-' : '+');
- for (i = SP_FBITS - 1; i >= 0; i--)
- printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
- printk("e%d", SPBEXP(x) - SP_EBIAS);
- break;
- default:
- printk("Illegal/Unknown IEEE754 value class");
- }
- printk("n");
- return x;
- }