Subversion Repositories planix.SVN

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 - 1 
#include "gc.h"
2 
 
3 
void
4 
noretval(int n)
5 
{
6 
 
7 
	if(n & 1) {
8 
		gins(ANOP, Z, Z);
9 
		p->to.type = D_REG;
10 
		p->to.reg = REGRET;
11 
	}
12 
	if(n & 2) {
13 
		gins(ANOP, Z, Z);
14 
		p->to.type = D_FREG;
15 
		p->to.reg = FREGRET;
16 
	}
17 
}
18 
 
19 
/*
20 
 *	calculate addressability as follows
21 
 *		CONST ==> 20		$value
22 
 *		NAME ==> 10		name
23 
 *		REGISTER ==> 11		register
24 
 *		INDREG ==> 12		*[(reg)+offset]
25 
 *		&10 ==> 2		$name
26 
 *		ADD(2, 20) ==> 2	$name+offset
27 
 *		ADD(3, 20) ==> 3	$(reg)+offset
28 
 *		&12 ==> 3		$(reg)+offset
29 
 *		*11 ==> 11		??
30 
 *		*2 ==> 10		name
31 
 *		*3 ==> 12		*(reg)+offset
32 
 *	calculate complexity (number of registers)
33 
 */
34 
void
35 
xcom(Node *n)
36 
{
37 
	Node *l, *r;
38 
	int t;
39 
 
40 
	if(n == Z)
41 
		return;
42 
	l = n->left;
43 
	r = n->right;
44 
	n->addable = 0;
45 
	n->complex = 0;
46 
	switch(n->op) {
47 
	case OCONST:
48 
		n->addable = 20;
49 
		return;
50 
 
51 
	case OREGISTER:
52 
		n->addable = 11;
53 
		return;
54 
 
55 
	case OINDREG:
56 
		n->addable = 12;
57 
		return;
58 
 
59 
	case ONAME:
60 
		n->addable = 10;
61 
		return;
62 
 
63 
	case OADDR:
64 
		xcom(l);
65 
		if(l->addable == 10)
66 
			n->addable = 2;
67 
		if(l->addable == 12)
68 
			n->addable = 3;
69 
		break;
70 
 
71 
	case OIND:
72 
		xcom(l);
73 
		if(l->addable == 11)
74 
			n->addable = 12;
75 
		if(l->addable == 3)
76 
			n->addable = 12;
77 
		if(l->addable == 2)
78 
			n->addable = 10;
79 
		break;
80 
 
81 
	case OADD:
82 
		xcom(l);
83 
		xcom(r);
84 
		if(l->addable == 20) {
85 
			if(r->addable == 2)
86 
				n->addable = 2;
87 
			if(r->addable == 3)
88 
				n->addable = 3;
89 
		}
90 
		if(r->addable == 20) {
91 
			if(l->addable == 2)
92 
				n->addable = 2;
93 
			if(l->addable == 3)
94 
				n->addable = 3;
95 
		}
96 
		break;
97 
 
98 
	case OASLMUL:
99 
	case OASMUL:
100 
		xcom(l);
101 
		xcom(r);
102 
		t = vlog(r);
103 
		if(t >= 0) {
104 
			n->op = OASASHL;
105 
			r->vconst = t;
106 
			r->type = types[TINT];
107 
		}
108 
		break;
109 
 
110 
	case OMUL:
111 
	case OLMUL:
112 
		xcom(l);
113 
		xcom(r);
114 
		t = vlog(r);
115 
		if(t >= 0) {
116 
			n->op = OASHL;
117 
			r->vconst = t;
118 
			r->type = types[TINT];
119 
		}
120 
		t = vlog(l);
121 
		if(t >= 0) {
122 
			n->op = OASHL;
123 
			n->left = r;
124 
			n->right = l;
125 
			r = l;
126 
			l = n->left;
127 
			r->vconst = t;
128 
			r->type = types[TINT];
129 
		}
130 
		break;
131 
 
132 
	case OASLDIV:
133 
		xcom(l);
134 
		xcom(r);
135 
		t = vlog(r);
136 
		if(t >= 0) {
137 
			n->op = OASLSHR;
138 
			r->vconst = t;
139 
			r->type = types[TINT];
140 
		}
141 
		break;
142 
 
143 
	case OLDIV:
144 
		xcom(l);
145 
		xcom(r);
146 
		t = vlog(r);
147 
		if(t >= 0) {
148 
			n->op = OLSHR;
149 
			r->vconst = t;
150 
			r->type = types[TINT];
151 
		}
152 
		break;
153 
 
154 
	case OASLMOD:
155 
		xcom(l);
156 
		xcom(r);
157 
		t = vlog(r);
158 
		if(t >= 0) {
159 
			n->op = OASAND;
160 
			r->vconst--;
161 
		}
162 
		break;
163 
 
164 
	case OLMOD:
165 
		xcom(l);
166 
		xcom(r);
167 
		t = vlog(r);
168 
		if(t >= 0) {
169 
			n->op = OAND;
170 
			r->vconst--;
171 
		}
172 
		break;
173 
 
174 
	default:
175 
		if(l != Z)
176 
			xcom(l);
177 
		if(r != Z)
178 
			xcom(r);
179 
		break;
180 
	}
181 
	if(n->addable >= 10)
182 
		return;
183 
 
184 
	if(l != Z)
185 
		n->complex = l->complex;
186 
	if(r != Z) {
187 
		if(r->complex == n->complex)
188 
			n->complex = r->complex+1;
189 
		else
190 
		if(r->complex > n->complex)
191 
			n->complex = r->complex;
192 
	}
193 
	if(n->complex == 0)
194 
		n->complex++;
195 
 
196 
	if(com64(n))
197 
		return;
198 
 
199 
	switch(n->op) {
200 
	case OFUNC:
201 
		n->complex = FNX;
202 
		break;
203 
 
204 
	case OADD:
205 
	case OXOR:
206 
	case OAND:
207 
	case OOR:
208 
	case OEQ:
209 
	case ONE:
210 
		/*
211 
		 * immediate operators, make const on right
212 
		 */
213 
		if(l->op == OCONST) {
214 
			n->left = r;
215 
			n->right = l;
216 
		}
217 
		break;
218 
	}
219 
}