clang/test/CodeGen/code-coverage-tsan.c

   1 /// -fprofile-update=atomic requires the (potentially concurrent) counter updates to be atomic.
   2 // RUN: %clang_cc1 %s -triple x86_64 -emit-llvm -fprofile-update=atomic \
   3 // RUN:   -coverage-notes-file=/dev/null -coverage-data-file=/dev/null -o - | FileCheck %s
   4
   5 // CHECK-LABEL: void @foo()
   6 /// Two counters are incremented by __tsan_atomic64_fetch_add.
   7 // CHECK:         atomicrmw add ptr @__llvm_gcov_ctr{{.*}} monotonic, align 8
   8 // CHECK-NEXT:    atomicrmw sub ptr
   9
  10 _Atomic(int) cnt;
  11 void foo(void) { cnt--; }