1 package edu.berkeley.fleet.util;
2 import edu.berkeley.fleet.api.*;
3 import edu.berkeley.fleet.*;
8 private final String str;
10 public final long mask;
11 public final long val;
12 public final long valmask;
13 public final int valmaskmin;
14 public final int valmaskmax;
15 public final int valmaskwidth;
16 public final int allmax;
17 public final int width;
19 public String verilog(String var) {
20 // FIXME: throw an exception if this is called when no 1-bits or 0-bits were specified (ie only v-bits)
22 StringBuffer sb = new StringBuffer();
26 for(int i=63; i>=0; i--) {
27 if ((mask & (1L << i)) == 0) continue;
28 if (!first) sb.append(",");
30 sb.append(var+"["+i+"]");
33 sb.append("}=="+count+"'b");
34 for(int i=63; i>=0; i--) {
35 if ((mask & (1L << i)) == 0) continue;
36 sb.append( (val & (1L << i))==0 ? "0" : "1" );
38 return "("+sb.toString()+")";
39 //return "(("+var+" & "+allmax+"'b"+Long.toString(mask,2)+")=="+allmax+"'b"+Long.toString(val,2)+")";
42 public long getval(long in) {
43 return (in & valmask) >>> valmaskmin;
45 public BitVector getvalAsBitVector(long in) {
47 return new BitVector(getWidth()).set(getval(in));
49 public BitVector getvalAsBitVector(BitVector in) {
51 return new BitVector(getWidth()).set(getval(in.toLong()));
53 public long getval(BitVector targ) {
55 for(int i=0; i<targ.length(); i++)
58 return (in & valmask) >>> valmaskmin;
60 public long setval(long in, BitVector targ) {
62 if (targ.length() != (1+valmaskmax-valmaskmin))
63 throw new RuntimeException("size mismatch trying to do "+this+".setval("+targ+")");
64 for(int i=valmaskmin; i<=valmaskmax; i++)
65 if (targ.get(i-valmaskmin))
71 public long setval(long in, long targ) {
72 if (((targ << valmaskmin) & ~valmask) != 0) throw new RuntimeException("setval() with argument bigger than mask field");
73 return (in & ~valmask) | ((targ << valmaskmin) & valmask);
75 public long set(long in) {
76 return (in & ~mask) | val;
78 public boolean get(long in) {
79 return (in & mask) == val;
82 public String toString() {
86 public int getWidth() {
89 for(int i=0; i<64; i++) {
90 if ((valmask & m)!=0) ret++;
96 public Mask(String s) {
101 int valmaskmin = Integer.MAX_VALUE;
104 this.width = s.length();
105 for(int i=0; i<s.length(); i++) {
106 char c = s.charAt(s.length()-1-i);
109 case '0': mask |= (1L<<i); val |= (0L<<i); break;
110 case '1': mask |= (1L<<i); val |= (1L<<i); break;
111 case 'v': valmask |= (1L<<i); valmaskmin = Math.min(valmaskmin,i); valmaskmax = Math.max(valmaskmax,i); break;
112 default: throw new Error(""+c);
114 if (c!='.') allmax = Math.max(allmax,i);
118 this.valmask = valmask;
119 this.valmaskmin = valmaskmin;
120 this.valmaskmax = valmaskmax;
121 this.allmax = allmax+1;
122 this.valmaskwidth = 1 + valmaskmax - valmaskmin;
125 public static long signExtend(long input, int wordWidth) {
126 if ((input & (1L << (wordWidth-1)))!=0)
127 input |= (-1L) << wordWidth;