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
|
// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify=precxx17 %std_cxx98-14 %s
// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify=cxx17 %std_cxx17- %s
namespace test1 {
struct Test {
template <typename T>
struct SeparateCacheLines {
T data;
} __attribute__((aligned(256)));
SeparateCacheLines<int> high_contention_data[10];
};
void helper() {
Test t;
new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
}
}
namespace test2 {
struct S {
char c[256];
};
class Test {
typedef S __attribute__((aligned(256))) alignedS;
alignedS high_contention_data[10];
};
void helper() {
Test t;
new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
}
}
namespace test3 {
struct Test {
template <typename T>
struct SeparateCacheLines {
T data;
} __attribute__((aligned(256)));
void* operator new(unsigned long) {
return 0; // precxx17-warning {{'operator new' should not return a null pointer unless it is declared 'throw()'}} \
cxx17-warning {{'operator new' should not return a null pointer unless it is declared 'throw()' or 'noexcept'}}
}
SeparateCacheLines<int> high_contention_data[10];
};
void helper() {
Test t;
new Test;
new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
}
}
namespace test4 {
struct Test {
template <typename T>
struct SeparateCacheLines {
T data;
} __attribute__((aligned(256)));
void* operator new[](unsigned long) {
return 0; // precxx17-warning {{'operator new[]' should not return a null pointer unless it is declared 'throw()'}} \
cxx17-warning {{'operator new[]' should not return a null pointer unless it is declared 'throw()' or 'noexcept'}}
}
SeparateCacheLines<int> high_contention_data[10];
};
void helper() {
Test t;
new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
new Test[10];
}
}
|
