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
|
const std = @import("std");
const assert = std.debug.assert;
const RegisterManagerFn = @import("../../register_manager.zig").RegisterManager;
const Type = @import("../../Type.zig");
const Zcu = @import("../../Zcu.zig");
pub const Class = union(enum) {
memory,
byval,
i32_array: u8,
i64_array: u8,
fn arrSize(total_size: u64, arr_size: u64) Class {
const count = @as(u8, @intCast(std.mem.alignForward(u64, total_size, arr_size) / arr_size));
if (arr_size == 32) {
return .{ .i32_array = count };
} else {
return .{ .i64_array = count };
}
}
};
pub const Context = enum { ret, arg };
pub fn classifyType(ty: Type, zcu: *Zcu, ctx: Context) Class {
assert(ty.hasRuntimeBitsIgnoreComptime(zcu));
var maybe_float_bits: ?u16 = null;
const max_byval_size = 512;
const ip = &zcu.intern_pool;
switch (ty.zigTypeTag(zcu)) {
.@"struct" => {
const bit_size = ty.bitSize(zcu);
if (ty.containerLayout(zcu) == .@"packed") {
if (bit_size > 64) return .memory;
return .byval;
}
if (bit_size > max_byval_size) return .memory;
const float_count = countFloats(ty, zcu, &maybe_float_bits);
if (float_count <= byval_float_count) return .byval;
const fields = ty.structFieldCount(zcu);
var i: u32 = 0;
while (i < fields) : (i += 1) {
const field_ty = ty.fieldType(i, zcu);
const field_alignment = ty.fieldAlignment(i, zcu);
const field_size = field_ty.bitSize(zcu);
if (field_size > 32 or field_alignment.compare(.gt, .@"32")) {
return Class.arrSize(bit_size, 64);
}
}
return Class.arrSize(bit_size, 32);
},
.@"union" => {
const bit_size = ty.bitSize(zcu);
const union_obj = zcu.typeToUnion(ty).?;
if (union_obj.flagsUnordered(ip).layout == .@"packed") {
if (bit_size > 64) return .memory;
return .byval;
}
if (bit_size > max_byval_size) return .memory;
const float_count = countFloats(ty, zcu, &maybe_float_bits);
if (float_count <= byval_float_count) return .byval;
for (union_obj.field_types.get(ip), 0..) |field_ty, field_index| {
if (Type.fromInterned(field_ty).bitSize(zcu) > 32 or
ty.fieldAlignment(field_index, zcu).compare(.gt, .@"32"))
{
return Class.arrSize(bit_size, 64);
}
}
return Class.arrSize(bit_size, 32);
},
.bool, .float => return .byval,
.int => {
// TODO this is incorrect for _BitInt(128) but implementing
// this correctly makes implementing compiler-rt impossible.
// const bit_size = ty.bitSize(zcu);
// if (bit_size > 64) return .memory;
return .byval;
},
.@"enum", .error_set => {
const bit_size = ty.bitSize(zcu);
if (bit_size > 64) return .memory;
return .byval;
},
.vector => {
const bit_size = ty.bitSize(zcu);
// TODO is this controlled by a cpu feature?
if (ctx == .ret and bit_size > 128) return .memory;
if (bit_size > 512) return .memory;
return .byval;
},
.optional => {
assert(ty.isPtrLikeOptional(zcu));
return .byval;
},
.pointer => {
assert(!ty.isSlice(zcu));
return .byval;
},
.error_union,
.frame,
.@"anyframe",
.noreturn,
.void,
.type,
.comptime_float,
.comptime_int,
.undefined,
.null,
.@"fn",
.@"opaque",
.enum_literal,
.array,
=> unreachable,
}
}
const byval_float_count = 4;
fn countFloats(ty: Type, zcu: *Zcu, maybe_float_bits: *?u16) u32 {
const ip = &zcu.intern_pool;
const target = zcu.getTarget();
const invalid = std.math.maxInt(u32);
switch (ty.zigTypeTag(zcu)) {
.@"union" => {
const union_obj = zcu.typeToUnion(ty).?;
var max_count: u32 = 0;
for (union_obj.field_types.get(ip)) |field_ty| {
const field_count = countFloats(Type.fromInterned(field_ty), zcu, maybe_float_bits);
if (field_count == invalid) return invalid;
if (field_count > max_count) max_count = field_count;
if (max_count > byval_float_count) return invalid;
}
return max_count;
},
.@"struct" => {
const fields_len = ty.structFieldCount(zcu);
var count: u32 = 0;
var i: u32 = 0;
while (i < fields_len) : (i += 1) {
const field_ty = ty.fieldType(i, zcu);
const field_count = countFloats(field_ty, zcu, maybe_float_bits);
if (field_count == invalid) return invalid;
count += field_count;
if (count > byval_float_count) return invalid;
}
return count;
},
.float => {
const float_bits = maybe_float_bits.* orelse {
const float_bits = ty.floatBits(target);
if (float_bits != 32 and float_bits != 64) return invalid;
maybe_float_bits.* = float_bits;
return 1;
};
if (ty.floatBits(target) == float_bits) return 1;
return invalid;
},
.void => return 0,
else => return invalid,
}
}
|
