에프에이리눅스 / 1611_0007_prime_oven

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kernel/linux-imx6_3.14.28/arch/mips/math-emu/ieee754d.c 3.65 KB
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6b13f685e   김민수   BSP 최초 추가 
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  /*
   * Some debug functions
   *
   * MIPS floating point support
   *
   * Copyright (C) 1994-2000 Algorithmics Ltd.
   *
   *  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>
  ", (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("
  ");
  	return x;
  }
  
  ieee754sp ieee754sp_dump(char *m, ieee754sp x)
  {
  	int i;
  
  	printk("%s=", m);
  	printk("<%08x>
  ", (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("
  ");
  	return x;
  }