clang/test/Profile/cxx-rangefor.cpp

   1 // Tests for instrumentation of C++11 range-for
   2
   3 // RUN: %clang_cc1 -x c++ %s -triple %itanium_abi_triple -main-file-name cxx-rangefor.cpp -std=c++11 -o - -emit-llvm -fprofile-instrument=clang > %tgen
   4 // RUN: FileCheck --input-file=%tgen -check-prefix=CHECK -check-prefix=PGOGEN %s
   5
   6 // RUN: llvm-profdata merge %S/Inputs/cxx-rangefor.proftext -o %t.profdata
   7 // RUN: %clang_cc1 -x c++ %s -triple %itanium_abi_triple -main-file-name cxx-rangefor.cpp -std=c++11 -o - -emit-llvm -fprofile-instrument-use-path=%t.profdata > %tuse
   8 // RUN: FileCheck --input-file=%tuse -check-prefix=CHECK -check-prefix=PGOUSE %s
   9
  10 // PGOGEN: @[[RFC:__profc__Z9range_forv]] = {{(private|internal)}} global [5 x i64] zeroinitializer
  11
  12 // CHECK-LABEL: define {{.*}}void @_Z9range_forv()
  13 // PGOGEN: store {{.*}} @[[RFC]]
  14 void range_for() {
  15   int arr[] = {1, 2, 3, 4, 5};
  16   int sum = 0;
  17   // PGOGEN: store {{.*}} @[[RFC]], i32 0, i32 1
  18   // PGOUSE: br {{.*}} !prof ![[RF1:[0-9]+]]
  19   for (auto i : arr) {
  20     // PGOGEN: store {{.*}} @[[RFC]], i32 0, i32 2
  21     // PGOUSE: br {{.*}} !prof ![[RF2:[0-9]+]]
  22     if (i == 3)
  23       continue;
  24     sum += i;
  25     // PGOGEN: store {{.*}} @[[RFC]], i32 0, i32 3
  26     // PGOUSE: br {{.*}} !prof ![[RF3:[0-9]+]]
  27     if (sum >= 7)
  28       break;
  29   }
  30
  31   // PGOGEN: store {{.*}} @[[RFC]], i32 0, i32 4
  32   // PGOUSE: br {{.*}} !prof ![[RF4:[0-9]+]]
  33   if (sum) {}
  34 }
  35
  36 // PGOUSE-DAG: ![[RF1]] = !{!"branch_weights", i32 5, i32 1}
  37 // PGOUSE-DAG: ![[RF2]] = !{!"branch_weights", i32 2, i32 4}
  38 // PGOUSE-DAG: ![[RF3]] = !{!"branch_weights", i32 2, i32 3}
  39 // PGOUSE-DAG: ![[RF4]] = !{!"branch_weights", i32 2, i32 1}
  40
  41 int main(int argc, const char *argv[]) {
  42   range_for();
  43   return 0;
  44 }