1 // Test that clang doesn't emit llvm.expect when the counter is 0 2 3 // RUN: llvm-profdata merge %S/Inputs/cxx-never-executed-branch.proftext -o %t.profdata 4 // RUN: %clang_cc1 -std=c++20 %s -triple %itanium_abi_triple -O2 -o - -emit-llvm -fprofile-instrument-use-path=%t.profdata -disable-llvm-passes | FileCheck %s 5 6 int rand(); 7 8 // CHECK: define {{.*}}@_Z13is_in_profilev 9 // CHECK-NOT: call {{.*}}@llvm.expect 10 is_in_profile()11int is_in_profile() { 12 int rando = rand(); 13 int x = 0; 14 if (rando == 0) [[likely]] 15 x = 2; 16 else 17 x = 3; 18 return x; 19 } 20 21 // CHECK: define {{.*}}@_Z17is_not_in_profilev 22 // CHECK: call {{.*}}@llvm.expect 23 is_not_in_profile()24int is_not_in_profile() { 25 int rando = rand(); 26 int x = 0; 27 if (rando == 0) [[likely]] 28 x = 2; 29 else 30 x = 3; 31 return x; 32 } 33