clang/test/Profile/misexpect-branch-cold.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 likely(x) __builtin_expect(!!(x), 1)
   8 #define unlikely(x) __builtin_expect(!!(x), 0)
   9
  10 int foo(int);
  11 int baz(int);
  12 int buzz();
  13
  14 const int inner_loop = 100;
  15 const int outer_loop = 2000;
  16
  17 int bar() {
  18   int rando = buzz();
  19   int x = 0;
  20   if (unlikely(rando % (outer_loop * inner_loop) == 0)) {
  21     x = baz(rando);
  22   } else {
  23     x = foo(50);
  24   }
  25   return x;
  26 }