File: misexpect-switch.c

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (39 lines) | stat: -rw-r--r-- 1,130 bytes parent folder | download | duplicates (6) 
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
 
// 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

#define inner_loop 1000
#define outer_loop 20
#define arry_size 25

int arry[arry_size] = {0};

int rand();
int sum(int *buff, int size);
int random_sample(int *buff, int size);

int main() {
  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;
}