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
|
// Test that misexpect detects mis-annotated switch statements for default case
// RUN: llvm-profdata merge %S/Inputs/misexpect-switch-default.proftext -o %t.profdata
// RUN: %clang_cc1 %s -O2 -o - -emit-llvm -fprofile-instrument-use-path=%t.profdata -verify -Wmisexpect -debug-info-kind=line-tables-only
#define inner_loop 1000
#define outer_loop 20
#define arry_size 25
int sum(int *buff, int size);
int random_sample(int *buff, int size);
int rand();
void init_arry();
int arry[arry_size] = {0};
int main() {
init_arry();
int val = 0;
int j;
for (j = 0; j < outer_loop * inner_loop; ++j) {
unsigned condition = rand() % 5;
switch (__builtin_expect(condition, 6)) { // expected-warning-re {{potential performance regression from use of __builtin_expect(): annotation was correct on {{.+}}% ({{[0-9]+ / [0-9]+}}) of profiled executions}}
case 0:
val += sum(arry, arry_size);
break;
case 1:
case 2:
case 3:
break;
case 4:
val += random_sample(arry, arry_size);
break;
default:
__builtin_unreachable();
} // end switch
} // end outer_loop
return 0;
}
|
