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| // Test that misexpect detects mis-annotated switch statements
// RUN: llvm-profdata merge %S/Inputs/misexpect-switch.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
int sum(int *buff, int size);
int random_sample(int *buff, int size);
int rand();
void init_arry();
const int inner_loop = 1000;
const int outer_loop = 20;
const int arry_size = 25;
int arry[arry_size] = {0};
int main() {
init_arry();
int val = 0;
int j, k;
for (j = 0; j < outer_loop; ++j) {
for (k = 0; k < inner_loop; ++k) {
unsigned condition = rand() % 10000;
switch (__builtin_expect(condition, 0)) { // 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;
default:
val += random_sample(arry, arry_size);
break;
} // end switch
} // end inner_loop
} // end outer_loop
return 0;
}
|