gem5  v22.0.0.1
scfx_utils.cc
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21 
22  scfx_utils.cpp -
23 
24  Original Author: Martin Janssen, Synopsys, Inc.
25 
26  *****************************************************************************/
27 
28 /*****************************************************************************
29 
30  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
31  changes you are making here.
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33  Name, Affiliation, Date:
34  Description of Modification:
35 
36  *****************************************************************************/
37 
38 
39 // $Log: scfx_utils.cpp,v $
40 // Revision 1.1.1.1 2006/12/15 20:20:04 acg
41 // SystemC 2.3
42 //
43 // Revision 1.3 2006/01/13 18:53:58 acg
44 // Andy Goodrich: added $Log command so that CVS comments are reproduced in
45 // the source.
46 //
47 
49 
50 namespace sc_dt
51 {
52 
53 void
54 scfx_tc2csd(scfx_string &s, int w_prefix)
55 {
56  if (w_prefix != 0) {
57  SC_ASSERT_(s[0] == '0' && s[1] == 'c' &&
58  s[2] == 's' && s[3] == 'd', "invalid prefix");
59  }
60 
61  scfx_string csd;
62 
63  // copy bits from 's' into 'csd'; skip prefix, point, and exponent
64  int i = 0;
65  int j = (w_prefix != 0 ? 4 : 0);
66  while (s[j]) {
67  if (s[j] == '0' || s[j] == '1')
68  csd[i ++] = s[j];
69  else if (s[j] != '.')
70  break;
71  ++j;
72  }
73  csd[i] = '\0';
74 
75  // convert 'csd' from two's complement to csd
76  --i;
77  while (i >= 0) {
78  if (csd[i] == '0') {
79  --i;
80  } else {
81  if (i > 0 && csd[i - 1] == '0') {
82  --i;
83  } else if (i == 0) {
84  csd[i--] = '-';
85  } else {
86  csd[i--] = '-';
87  while (i >= 0 && csd[i] == '1')
88  csd[i--] = '0';
89  if (i > 0)
90  csd[i] = '1';
91  else if (i == 0)
92  csd[i--] = '1';
93  }
94  }
95  }
96 
97  // copy bits from 'csd' back into 's'
98  i = 0;
99  j = (w_prefix != 0 ? 4 : 0);
100  while (csd[i]) {
101  if (s[j] == '.')
102  ++j;
103  s[j++] = csd[i++];
104  }
105 }
106 
107 
108 void
109 scfx_csd2tc(scfx_string &csd)
110 {
111  SC_ASSERT_(csd[0] == '0' && csd[1] == 'c' &&
112  csd[2] == 's' && csd[3] == 'd', "invalid prefix");
113 
114  scfx_string s;
115 
116  // copy bits from 'csd' into 's'; skip prefix, point, and exponent
117  int i = 0;
118  s[i++] = '0';
119  int j = 4;
120  while (csd[j]) {
121  if (csd[j] == '-' || csd[j] == '0' || csd[j] == '1')
122  s[i++] = csd[j];
123  else if (csd[j] != '.')
124  break;
125  ++j;
126  }
127  s[i] = '\0';
128 
129  // convert 's' from csd to two's complement
130  int len = i;
131  i = 1;
132  while (i < len) {
133  while (i < len && s[i] != '-')
134  i++;
135  if (i < len) {
136  j = i++;
137  s[j--] = '1';
138  while (j >= 0 && s[j] == '0')
139  s[j--] = '1';
140  if (j >= 0)
141  s[j] = '0';
142  }
143  }
144 
145  // copy bits from 's' back into 'csd'
146  j = csd.length();
147  csd[j + 1] = '\0';
148  while (j > 4) {
149  csd[j] = csd[j - 1];
150  --j;
151  }
152 
153  i = 0;
154  j = 4;
155  while (s[i]) {
156  if (csd[j] == '.')
157  ++j;
158  csd[j++] = s[i++];
159  }
160 }
161 
162 } // namespace sc_dt
gem5::VegaISA::s
Bitfield< 1 > s
Definition: pagetable.hh:64
sc_dt
Definition: sc_bit.cc:67
sc_dt::scfx_tc2csd
void scfx_tc2csd(scfx_string &s, int w_prefix)
Definition: scfx_utils.cc:85
gem5::ArmISA::i
Bitfield< 7 > i
Definition: misc_types.hh:67
gem5::ArmISA::j
Bitfield< 24 > j
Definition: misc_types.hh:57
len
uint16_t len
Definition: helpers.cc:62
scfx_utils.hh
sc_dt::scfx_csd2tc
void scfx_csd2tc(scfx_string &csd)
Definition: scfx_utils.cc:140
SC_ASSERT_
#define SC_ASSERT_(cnd, msg)
Definition: sc_fxdefs.hh:248

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