clang/test/Profile/misexpect-branch-unpredictable.c

   1 // Test that misexpect emits no warning when prediction is correct
   2
   3 // RUN: llvm-profdata merge %S/Inputs/misexpect-branch.proftext -o %t.profdata
   4 // RUN: %clang_cc1 %s -O2 -o - -disable-llvm-passes -emit-llvm -fprofile-instrument-use-path=%t.profdata -verify -Wmisexpect
   5
   6 // expected-no-diagnostics
   7 #define unpredictable(x) __builtin_unpredictable(!!(x))
   8
   9 int foo(int);
  10 int baz(int);
  11 int buzz();
  12
  13 const int inner_loop = 100;
  14 const int outer_loop = 2000;
  15
  16 int bar() {
  17   int rando = buzz();
  18   int x = 0;
  19   if (unpredictable(rando % (outer_loop * inner_loop) == 0)) {
  20     x = baz(rando);
  21   } else {
  22     x = foo(50);
  23   }
  24   return x;
  25 }