github.com/ader1990/go@v0.0.0-20140630135419-8c24447fa791/src/cmd/cc/bits.c (about)

     1  // Inferno utils/cc/bits.c
     2  // http://code.google.com/p/inferno-os/source/browse/utils/cc/bits.c
     3  //
     4  //	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
     5  //	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
     6  //	Portions Copyright © 1997-1999 Vita Nuova Limited
     7  //	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
     8  //	Portions Copyright © 2004,2006 Bruce Ellis
     9  //	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
    10  //	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
    11  //	Portions Copyright © 2009 The Go Authors.  All rights reserved.
    12  //
    13  // Permission is hereby granted, free of charge, to any person obtaining a copy
    14  // of this software and associated documentation files (the "Software"), to deal
    15  // in the Software without restriction, including without limitation the rights
    16  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    17  // copies of the Software, and to permit persons to whom the Software is
    18  // furnished to do so, subject to the following conditions:
    19  //
    20  // The above copyright notice and this permission notice shall be included in
    21  // all copies or substantial portions of the Software.
    22  //
    23  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    24  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    25  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    26  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    27  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    28  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    29  // THE SOFTWARE.
    30  
    31  #include	<u.h>
    32  #include	"cc.h"
    33  
    34  Bits
    35  bor(Bits a, Bits b)
    36  {
    37  	Bits c;
    38  	int i;
    39  
    40  	for(i=0; i<BITS; i++)
    41  		c.b[i] = a.b[i] | b.b[i];
    42  	return c;
    43  }
    44  
    45  Bits
    46  band(Bits a, Bits b)
    47  {
    48  	Bits c;
    49  	int i;
    50  
    51  	for(i=0; i<BITS; i++)
    52  		c.b[i] = a.b[i] & b.b[i];
    53  	return c;
    54  }
    55  
    56  /*
    57  Bits
    58  bnot(Bits a)
    59  {
    60  	Bits c;
    61  	int i;
    62  
    63  	for(i=0; i<BITS; i++)
    64  		c.b[i] = ~a.b[i];
    65  	return c;
    66  }
    67  */
    68  
    69  int
    70  bany(Bits *a)
    71  {
    72  	int i;
    73  
    74  	for(i=0; i<BITS; i++)
    75  		if(a->b[i])
    76  			return 1;
    77  	return 0;
    78  }
    79  
    80  int
    81  beq(Bits a, Bits b)
    82  {
    83  	int i;
    84  
    85  	for(i=0; i<BITS; i++)
    86  		if(a.b[i] != b.b[i])
    87  			return 0;
    88  	return 1;
    89  }
    90  
    91  int
    92  bnum(Bits a)
    93  {
    94  	int i;
    95  	int32 b;
    96  
    97  	for(i=0; i<BITS; i++)
    98  		if(b = a.b[i])
    99  			return 32*i + bitno(b);
   100  	diag(Z, "bad in bnum");
   101  	return 0;
   102  }
   103  
   104  Bits
   105  blsh(uint n)
   106  {
   107  	Bits c;
   108  
   109  	c = zbits;
   110  	c.b[n/32] = 1L << (n%32);
   111  	return c;
   112  }
   113  
   114  int
   115  bset(Bits a, uint n)
   116  {
   117  	if(a.b[n/32] & (1L << (n%32)))
   118  		return 1;
   119  	return 0;
   120  }