1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
#include "all.h"
/* boring folding code */
static int
iscon(Con *c, int w, uint64_t k)
{
if (c->type != CBits)
return 0;
if (w)
return (uint64_t)c->bits.i == k;
else
return (uint32_t)c->bits.i == (uint32_t)k;
}
static int
foldint(Con *res, int op, int w, Con *cl, Con *cr)
{
union {
int64_t s;
uint64_t u;
float fs;
double fd;
} l, r;
uint64_t x;
Sym sym;
int typ;
memset(&sym, 0, sizeof sym);
typ = CBits;
l.s = cl->bits.i;
r.s = cr->bits.i;
if (op == Oadd) {
if (cl->type == CAddr) {
if (cr->type == CAddr)
return 1;
typ = CAddr;
sym = cl->sym;
}
else if (cr->type == CAddr) {
typ = CAddr;
sym = cr->sym;
}
}
else if (op == Osub) {
if (cl->type == CAddr) {
if (cr->type != CAddr) {
typ = CAddr;
sym = cl->sym;
} else if (!symeq(cl->sym, cr->sym))
return 1;
}
else if (cr->type == CAddr)
return 1;
}
else if (cl->type == CAddr || cr->type == CAddr)
return 1;
if (op == Odiv || op == Orem || op == Oudiv || op == Ourem) {
if (iscon(cr, w, 0))
return 1;
if (op == Odiv || op == Orem) {
x = w ? INT64_MIN : INT32_MIN;
if (iscon(cr, w, -1))
if (iscon(cl, w, x))
return 1;
}
}
switch (op) {
case Oadd: x = l.u + r.u; break;
case Osub: x = l.u - r.u; break;
case Oneg: x = -l.u; break;
case Odiv: x = w ? l.s / r.s : (int32_t)l.s / (int32_t)r.s; break;
case Orem: x = w ? l.s % r.s : (int32_t)l.s % (int32_t)r.s; break;
case Oudiv: x = w ? l.u / r.u : (uint32_t)l.u / (uint32_t)r.u; break;
case Ourem: x = w ? l.u % r.u : (uint32_t)l.u % (uint32_t)r.u; break;
case Omul: x = l.u * r.u; break;
case Oand: x = l.u & r.u; break;
case Oor: x = l.u | r.u; break;
case Oxor: x = l.u ^ r.u; break;
case Osar: x = (w ? l.s : (int32_t)l.s) >> (r.u & (31|w<<5)); break;
case Oshr: x = (w ? l.u : (uint32_t)l.u) >> (r.u & (31|w<<5)); break;
case Oshl: x = l.u << (r.u & (31|w<<5)); break;
case Oextsb: x = (int8_t)l.u; break;
case Oextub: x = (uint8_t)l.u; break;
case Oextsh: x = (int16_t)l.u; break;
case Oextuh: x = (uint16_t)l.u; break;
case Oextsw: x = (int32_t)l.u; break;
case Oextuw: x = (uint32_t)l.u; break;
case Ostosi: x = w ? (int64_t)cl->bits.s : (int32_t)cl->bits.s; break;
case Ostoui: x = w ? (uint64_t)cl->bits.s : (uint32_t)cl->bits.s; break;
case Odtosi: x = w ? (int64_t)cl->bits.d : (int32_t)cl->bits.d; break;
case Odtoui: x = w ? (uint64_t)cl->bits.d : (uint32_t)cl->bits.d; break;
case Ocast:
x = l.u;
if (cl->type == CAddr) {
typ = CAddr;
sym = cl->sym;
}
break;
default:
if (Ocmpw <= op && op <= Ocmpl1) {
if (op <= Ocmpw1) {
l.u = (int32_t)l.u;
r.u = (int32_t)r.u;
} else
op -= Ocmpl - Ocmpw;
switch (op - Ocmpw) {
case Ciule: x = l.u <= r.u; break;
case Ciult: x = l.u < r.u; break;
case Cisle: x = l.s <= r.s; break;
case Cislt: x = l.s < r.s; break;
case Cisgt: x = l.s > r.s; break;
case Cisge: x = l.s >= r.s; break;
case Ciugt: x = l.u > r.u; break;
case Ciuge: x = l.u >= r.u; break;
case Cieq: x = l.u == r.u; break;
case Cine: x = l.u != r.u; break;
default: die("unreachable");
}
}
else if (Ocmps <= op && op <= Ocmps1) {
switch (op - Ocmps) {
case Cfle: x = l.fs <= r.fs; break;
case Cflt: x = l.fs < r.fs; break;
case Cfgt: x = l.fs > r.fs; break;
case Cfge: x = l.fs >= r.fs; break;
case Cfne: x = l.fs != r.fs; break;
case Cfeq: x = l.fs == r.fs; break;
case Cfo: x = l.fs < r.fs || l.fs >= r.fs; break;
case Cfuo: x = !(l.fs < r.fs || l.fs >= r.fs); break;
default: die("unreachable");
}
}
else if (Ocmpd <= op && op <= Ocmpd1) {
switch (op - Ocmpd) {
case Cfle: x = l.fd <= r.fd; break;
case Cflt: x = l.fd < r.fd; break;
case Cfgt: x = l.fd > r.fd; break;
case Cfge: x = l.fd >= r.fd; break;
case Cfne: x = l.fd != r.fd; break;
case Cfeq: x = l.fd == r.fd; break;
case Cfo: x = l.fd < r.fd || l.fd >= r.fd; break;
case Cfuo: x = !(l.fd < r.fd || l.fd >= r.fd); break;
default: die("unreachable");
}
}
else
die("unreachable");
}
*res = (Con){.type=typ, .sym=sym, .bits={.i=x}};
return 0;
}
static void
foldflt(Con *res, int op, int w, Con *cl, Con *cr)
{
float xs, ls, rs;
double xd, ld, rd;
if (cl->type != CBits || cr->type != CBits)
err("invalid address operand for '%s'", optab[op].name);
*res = (Con){.type = CBits};
memset(&res->bits, 0, sizeof(res->bits));
if (w) {
ld = cl->bits.d;
rd = cr->bits.d;
switch (op) {
case Oadd: xd = ld + rd; break;
case Osub: xd = ld - rd; break;
case Oneg: xd = -ld; break;
case Odiv: xd = ld / rd; break;
case Omul: xd = ld * rd; break;
case Oswtof: xd = (int32_t)cl->bits.i; break;
case Ouwtof: xd = (uint32_t)cl->bits.i; break;
case Osltof: xd = (int64_t)cl->bits.i; break;
case Oultof: xd = (uint64_t)cl->bits.i; break;
case Oexts: xd = cl->bits.s; break;
case Ocast: xd = ld; break;
default: die("unreachable");
}
res->bits.d = xd;
res->flt = 2;
} else {
ls = cl->bits.s;
rs = cr->bits.s;
switch (op) {
case Oadd: xs = ls + rs; break;
case Osub: xs = ls - rs; break;
case Oneg: xs = -ls; break;
case Odiv: xs = ls / rs; break;
case Omul: xs = ls * rs; break;
case Oswtof: xs = (int32_t)cl->bits.i; break;
case Ouwtof: xs = (uint32_t)cl->bits.i; break;
case Osltof: xs = (int64_t)cl->bits.i; break;
case Oultof: xs = (uint64_t)cl->bits.i; break;
case Otruncd: xs = cl->bits.d; break;
case Ocast: xs = ls; break;
default: die("unreachable");
}
res->bits.s = xs;
res->flt = 1;
}
}
static Ref
opfold(int op, int cls, Con *cl, Con *cr, Fn *fn)
{
Ref r;
Con c;
if (cls == Kw || cls == Kl) {
if (foldint(&c, op, cls == Kl, cl, cr))
return R;
} else
foldflt(&c, op, cls == Kd, cl, cr);
if (!KWIDE(cls))
c.bits.i &= 0xffffffff;
r = newcon(&c, fn);
assert(!(cls == Ks || cls == Kd) || c.flt);
return r;
}
/* used by GVN */
Ref
foldref(Fn *fn, Ins *i)
{
Ref rr;
Con *cl, *cr;
if (rtype(i->to) != RTmp)
return R;
if (optab[i->op].canfold) {
if (rtype(i->arg[0]) != RCon)
return R;
cl = &fn->con[i->arg[0].val];
rr = i->arg[1];
if (req(rr, R))
rr = CON_Z;
if (rtype(rr) != RCon)
return R;
cr = &fn->con[rr.val];
return opfold(i->op, i->cls, cl, cr, fn);
}
return R;
}
|
