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
|
#include "t_aarch64.h"
/* Ref: https://github.com/ARM-software/abi-aa/blob/2025Q4/aapcs64/aapcs64.rst */
static bool
hfa_scalar(enum typetag *hfa_t, enum typetag t)
{
if (!isfltt(t)) return 0;
if (!*hfa_t) *hfa_t = t;
else if (*hfa_t != t) return 0;
return 1;
}
static bool cls_hfa(enum typetag *, const TypeData *td);
static bool
hfa_arr(enum typetag *hfa_t, Type ty)
{
Type chld = typechild(ty);
if (isagg(chld))
return cls_hfa(hfa_t, &typedata[chld.dat]);
if (chld.t == TYARRAY)
return hfa_arr(hfa_t, chld);
return hfa_scalar(hfa_t, scalartypet(chld));
}
static bool
cls_hfa(enum typetag *hfa_t, const TypeData *td)
{
assert(isaggt(td->t));
for (int i = 0; i < td->nmemb; ++i) {
FieldData *fld = &td->fld[i].f;
if (isagg(fld->t)) {
if (!cls_hfa(hfa_t, &typedata[fld->t.dat]))
return 0;
} else if (fld->t.t == TYARRAY) {
if (isincomplete(fld->t)) continue;
if (!hfa_arr(hfa_t, fld->t))
return 0;
} else {
if (!hfa_scalar(hfa_t, scalartypet(fld->t)))
return 0;
}
}
return 1;
}
static enum irclass
classify(const TypeData *td)
{
if (td->siz > 16) return 0;
enum typetag hfa_t = 0;
return cls_hfa(&hfa_t, td) ? type2cls[hfa_t] : (td->siz > 4 ? KI64 : KI32);
}
/* XXX types with alignment >= 16 */
static int
abiarg(short r[2], uchar cls[2], uchar *r2off, int *ni, int *nf, int *ns, IRType typ)
{
enum { NINT = 8, NFLT = 8 };
if (!typ.isagg) {
if (kisflt(cls[0] = typ.cls) && *nf < 8) {
r[0] = V(0) + (*nf)++;
} else if (kisint(cls[0]) && *ni < NINT) {
r[0] = R0 + (*ni)++;
} else { /* passed on the stack */
r[0] = *ns;
*ns += 8;
return 0;
}
return 1;
}
cls[0] = cls[1] = 0;
enum irclass k = classify(&typedata[typ.dat]);
if (!k) { /* copied to caller memory and passed as a pointer */
cls[0] = KPTR;
if (*ni < NINT) { /* in a gpr */
r[0] = R0 + (*ni)++;
return 1;
} else { /* that pointer, passed on the stack */
r[0] = *ns;
*ns += 8;
return -1;
}
}
*r2off = cls2siz[k];
int n;
uint tsiz = typedata[typ.dat].siz;
if (kisflt(k)) { /* HFAA ([1..4]f32 or [1..2]f64) */
n = tsiz / cls2siz[k];
assert(n <= 2 && "oops");
if (n <= NFLT - *nf) {
for (int i = 0; i < n; ++i) {
r[i] = V(0) + *nf + i;
cls[i] = k;
}
*nf += n;
} else { /* stack */
*nf = NFLT;
Stack:
r[0] = *ns;
*ns = alignup(*ns + tsiz, 8);
r[1] = -1;
return cls[0] = cls[1] = 0;
}
} else { /* Composite Type <= 16 bytes */
n = 1 + (tsiz > 8);
if (n <= NINT - *ni) {
r[0] = R0 + *ni;
if (n > 1) r[1] = r[0] + 1;
*ni += n;
cls[0] = tsiz > 4 ? KI64 : KI32;
if (n > 1) cls[1] = KI64;
} else {
*ni = NINT;
goto Stack;
}
}
return n;
}
static int
abiret(short r[2], uchar cls[2], uchar *r2off, int *_ni, IRType typ)
{
if (!typ.isagg) {
r[0] = kisflt(cls[0] = typ.cls) ? V(0) : R0;
return 1;
}
int ni = 0, nf = 0, ns = 0;
int ret = abiarg(r, cls, r2off, &ni, &nf, &ns, typ);
if (ret && cls[0] != KPTR) /* in regs */
return ret;
/* caller-allocated result address in x8 */
r[0] = -1;
r[1] = R(8);
return 0;
}
static void
vastart(Function *fn, Block *blk, int *curi)
{
assert(!"nyi");
}
static void
vaarg(Function *fn, Block *blk, int *curi)
{
assert(!"nyi");
}
static const char aarch64_rnames[][6] = {
"R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7", "R8", "R9","R10","R11","R12","R13","R14","R15",
"R16","R17","R18","R19","R20","R21","R22","R23","R24","R25","R26","R27","R28", "FP", "LR", "SP",
"V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7", "V8", "V9","V10","V11","V12","V13","V14","V15",
"V16","V17","V18","V19","V20","V21","V22","V23","V24","V25","V26","V27","V28","V29","V30","V31",
};
const MCTarg t_aarch64_aapcs = {
.gpr0 = R0, .ngpr = 31,
.bpr = FP,
.gprscratch = R(16), .fprscratch = V(31),
.fpr0 = V0, .nfpr = 32,
.rcallee = BIT(R(19)) | BIT(R(20)) | BIT(R(21)) | BIT(R(22)) | BIT(R(23))
| BIT(R(24)) | BIT(R(25)) | BIT(R(26)) | BIT(R(27)) | BIT(R(28))
| BIT( V(8)) | BIT( V(9)) | BIT(V(10)) | BIT(V(11)) | BIT(V(12))
| BIT(V(13)) | BIT(V(14)) | BIT(V(15)),
.rglob = BIT(FP) | BIT(LR) | BIT(SP),
.rnames = aarch64_rnames,
.objkind = OBJELF,
.abiret = abiret,
.abiarg = abiarg,
.vastart = vastart,
.vaarg = vaarg,
.isel = aarch64_isel,
.emit = aarch64_emit,
};
/* vim:set ts=3 sw=3 expandtab: */
|
