clang/test/CodeGenCXX/static-initializer-branch-weights.cpp

   1 // RUN: %clang_cc1 -emit-llvm -std=c++1z %s -o - -triple=x86_64-linux-gnu | FileCheck %s
   2
   3 struct S { S(); ~S(); };
   4
   5 // CHECK-LABEL: define {{.*}}global_var_init
   6 // CHECK-NOT: br
   7 // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @global)
   8 S global;
   9
  10 // CHECK-LABEL: define {{.*}}global_var_init
  11 // FIXME: Do we really need thread-safe initialization here? We don't run
  12 // global ctors on multiple threads. (If we were to do so, we'd need thread-safe
  13 // init for B<int>::member and B<int>::inline_member too.)
  14 // CHECK: load atomic i8, ptr @_ZGV13inline_global acquire, align 8
  15 // CHECK: icmp eq i8 {{.*}}, 0
  16 // CHECK: br i1
  17 // CHECK-NOT: !prof
  18 // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @inline_global)
  19 inline S inline_global;
  20
  21 // CHECK-LABEL: define {{.*}}global_var_init
  22 // CHECK-NOT: br
  23 // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @thread_local_global)
  24 thread_local S thread_local_global;
  25
  26 // CHECK-LABEL: define {{.*}}global_var_init
  27 // CHECK: load i8, ptr @_ZGV26thread_local_inline_global
  28 // CHECK: icmp eq i8 {{.*}}, 0
  29 // CHECK: br i1
  30 // CHECK-NOT: !prof
  31 // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @thread_local_inline_global)
  32 thread_local inline S thread_local_inline_global;
  33
  34 struct A {
  35   static S member;
  36   static thread_local S thread_local_member;
  37
  38   // CHECK-LABEL: define {{.*}}global_var_init
  39   // CHECK: load atomic i8, ptr @_ZGVN1A13inline_memberE acquire, align 8
  40   // CHECK: icmp eq i8 {{.*}}, 0
  41   // CHECK: br i1
  42   // CHECK-NOT: !prof
  43   // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @_ZN1A13inline_memberE)
  44   static inline S inline_member;
  45
  46   // CHECK-LABEL: define {{.*}}global_var_init
  47   // CHECK: load i8, ptr @_ZGVN1A26thread_local_inline_memberE
  48   // CHECK: icmp eq i8 {{.*}}, 0
  49   // CHECK: br i1
  50   // CHECK-NOT: !prof
  51   // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @_ZN1A26thread_local_inline_memberE)
  52   static thread_local inline S thread_local_inline_member;
  53 };
  54
  55 // CHECK-LABEL: define{{.*}} void @_Z1fv()
  56 void f() {
  57   // CHECK: load atomic i8, ptr @_ZGVZ1fvE12static_local acquire, align 8
  58   // CHECK: icmp eq i8 {{.*}}, 0
  59   // CHECK: br i1 {{.*}}, !prof ![[WEIGHTS_LOCAL:[0-9]*]]
  60   static S static_local;
  61
  62   // CHECK: load i8, ptr @_ZGVZ1fvE19static_thread_local,
  63   // CHECK: icmp eq i8 {{.*}}, 0
  64   // CHECK: br i1 {{.*}}, !prof ![[WEIGHTS_THREAD_LOCAL:[0-9]*]]
  65   static thread_local S static_thread_local;
  66 }
  67
  68 // CHECK-LABEL: define {{.*}}global_var_init
  69 // CHECK-NOT: br
  70 // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @_ZN1A6memberE)
  71 S A::member;
  72
  73 // CHECK-LABEL: define {{.*}}global_var_init
  74 // CHECK-NOT: br
  75 // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @_ZN1A19thread_local_memberE)
  76 thread_local S A::thread_local_member;
  77
  78 template <typename T> struct B {
  79   // CHECK-LABEL: define {{.*}}global_var_init
  80   // CHECK: load i8, ptr @_ZGVN1BIiE6memberE
  81   // CHECK: icmp eq i8 {{.*}}, 0
  82   // CHECK: br i1
  83   // CHECK-NOT: !prof
  84   // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @_ZN1BIiE6memberE)
  85   static S member;
  86
  87   // CHECK-LABEL: define {{.*}}global_var_init
  88   // CHECK: load i8, ptr @_ZGVN1BIiE13inline_memberE
  89   // CHECK: icmp eq i8 {{.*}}, 0
  90   // CHECK: br i1
  91   // CHECK-NOT: !prof
  92   // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @_ZN1BIiE13inline_memberE)
  93   static inline S inline_member;
  94
  95   // CHECK-LABEL: define {{.*}}global_var_init
  96   // CHECK: load i8, ptr @_ZGVN1BIiE19thread_local_memberE
  97   // CHECK: icmp eq i8 {{.*}}, 0
  98   // CHECK: br i1
  99   // CHECK-NOT: !prof
 100   // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @_ZN1BIiE19thread_local_memberE)
 101   static thread_local S thread_local_member;
 102
 103   // CHECK-LABEL: define {{.*}}global_var_init
 104   // CHECK: load i8, ptr @_ZGVN1BIiE26thread_local_inline_memberE
 105   // CHECK: icmp eq i8 {{.*}}, 0
 106   // CHECK: br i1
 107   // CHECK-NOT: !prof
 108   // CHECK: call void @_ZN1SC1Ev(ptr {{[^,]*}} @_ZN1BIiE26thread_local_inline_memberE)
 109   static thread_local inline S thread_local_inline_member;
 110 };
 111 template<typename T> S B<T>::member;
 112 template<typename T> thread_local S B<T>::thread_local_member;
 113
 114 template<typename ...T> void use(T &...);
 115 void use_b() {
 116   use(B<int>::member, B<int>::inline_member, B<int>::thread_local_member,
 117       B<int>::thread_local_inline_member);
 118 }
 119
 120 // CHECK-LABEL: define {{.*}}tls_init()
 121 // CHECK: load i8, ptr @__tls_guard, align 1
 122 // CHECK: icmp eq i8 {{.*}}, 0
 123 // CHECK: br i1 {{.*}}, !prof ![[WEIGHTS_THREAD_LOCAL]]
 124
 125 // CHECK-DAG: ![[WEIGHTS_THREAD_LOCAL]] = !{!"branch_weights", i32 1, i32 1023}
 126 // CHECK-DAG: ![[WEIGHTS_LOCAL]] = !{!"branch_weights", i32 1, i32 1048575}