clang/test/CodeGenCXX/cxx1z-decomposition.cpp

   1 // RUN: %clang_cc1 -std=c++1z -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s
   2
   3 namespace std {
   4   using size_t = decltype(sizeof(0));
   5   template<typename> struct tuple_size;
   6   template<size_t, typename> struct tuple_element;
   7 }
   8
   9 struct Y { int n; };
  10 struct X { X(); X(Y); X(const X&); ~X(); };
  11
  12 struct A { int a : 13; bool b; };
  13
  14 struct B {};
  15 template<> struct std::tuple_size<B> { enum { value = 2 }; };
  16 template<> struct std::tuple_element<0,B> { using type = X; };
  17 template<> struct std::tuple_element<1,B> { using type = const int&; };
  18 template<int N> auto get(B) {
  19   if constexpr (N == 0)
  20     return Y();
  21   else
  22     return 0.0;
  23 }
  24
  25 using C = int[2];
  26
  27 typedef int D __attribute__((ext_vector_type(2)));
  28
  29 using E = _Complex int;
  30
  31 template<typename T> T &make();
  32
  33 // CHECK: @_ZDC2a12a2E ={{.*}} global {{.*}} zeroinitializer, align 4
  34 auto [a1, a2] = make<A>();
  35 // CHECK: @_ZDC2b12b2E ={{.*}} global {{.*}} zeroinitializer, align 1
  36 // CHECK: @b1 ={{.*}} global ptr null, align 8
  37 // CHECK: @_ZGR2b1_ = internal global {{.*}} zeroinitializer, align 1
  38 // CHECK: @b2 ={{.*}} global ptr null, align 8
  39 // CHECK: @_ZGR2b2_ = internal global i32 0, align 4
  40 auto [b1, b2] = make<B>();
  41 // CHECK: @_ZDC2c12c2E ={{.*}} global ptr null, align 8
  42 auto &[c1, c2] = make<C>();
  43 // CHECK: @_ZDC2d12d2E ={{.*}} global <2 x i32> zeroinitializer, align 8
  44 auto [d1, d2] = make<D>();
  45 // CHECK: @_ZDC2e12e2E ={{.*}} global { i32, i32 } zeroinitializer, align 4
  46 auto [e1, e2] = make<E>();
  47
  48 // CHECK: call {{.*}}ptr @_Z4makeI1AERT_v()
  49 // CHECK: call {{.*}}memcpy{{.*}}@_ZDC2a12a2E
  50
  51 // CHECK: @_Z4makeI1BERT_v()
  52 //   CHECK: call i32 @_Z3getILi0EEDa1B()
  53 //   CHECK: call void @_ZN1XC1E1Y(ptr {{[^,]*}} @_ZGR2b1_, i32
  54 //   CHECK: call i32 @__cxa_atexit({{.*}}@_ZN1XD1Ev{{.*}}@_ZGR2b1_
  55 //   CHECK: store ptr @_ZGR2b1_,
  56 //
  57 //   CHECK: call noundef double @_Z3getILi1EEDa1B()
  58 //   CHECK: fptosi double %{{.*}} to i32
  59 //   CHECK: store i32 %{{.*}}, ptr @_ZGR2b2_
  60 //   CHECK: store ptr @_ZGR2b2_, ptr @b2
  61
  62 // CHECK: call {{.*}}ptr @_Z4makeIA2_iERT_v()
  63 // CHECK: store {{.*}}, ptr @_ZDC2c12c2E
  64
  65 // CHECK: call {{.*}}ptr @_Z4makeIDv2_iERT_v()
  66 // CHECK: store {{.*}}, ptr @_ZDC2d12d2E, align 8
  67
  68 // CHECK: call {{.*}}ptr @_Z4makeICiERT_v()
  69 // CHECK: store i32 %{{.*}}, ptr @_ZDC2e12e2E
  70 // CHECK: store i32 %{{.*}}, ptr getelementptr inbounds ({ i32, i32 }, ptr @_ZDC2e12e2E, i32 0, i32 1)
  71
  72 // CHECK: define{{.*}} i32 @_Z12test_globalsv()
  73 int test_globals() {
  74   return a2 + b2 + c2 + d2 + e2;
  75   // CHECK: load i8, ptr getelementptr inbounds (%struct.A, ptr @_ZDC2a12a2E, i32 0, i32 1)
  76   //
  77   // CHECK: %[[b2:.*]] = load ptr, ptr @b2
  78   // CHECK: load i32, ptr %[[b2]]
  79   //
  80   // CHECK: %[[c1c2:.*]] = load ptr, ptr @_ZDC2c12c2E
  81   // CHECK: %[[c2:.*]] = getelementptr inbounds [2 x i32], ptr %[[c1c2]], i64 0, i64 1
  82   // CHECK: load i32, ptr %[[c2]]
  83   //
  84   // CHECK: %[[d1d2:.*]] = load <2 x i32>, ptr @_ZDC2d12d2E
  85   // CHECK: extractelement <2 x i32> %[[d1d2]], i32 1
  86   //
  87   // CHECK: load i32, ptr getelementptr inbounds ({ i32, i32 }, ptr @_ZDC2e12e2E, i32 0, i32 1)
  88 }
  89
  90 // CHECK: define{{.*}} i32 @_Z11test_localsv()
  91 int test_locals() {
  92   auto [b1, b2] = make<B>();
  93
  94   // CHECK: @_Z4makeI1BERT_v()
  95   //   CHECK: call i32 @_Z3getILi0EEDa1B()
  96   //   CHECK: call void @_ZN1XC1E1Y(ptr {{[^,]*}} %[[b1:.*]], i32
  97   //
  98   //   CHECK: call noundef double @_Z3getILi1EEDa1B()
  99   //   CHECK: %[[cvt:.*]] = fptosi double %{{.*}} to i32
 100   //   CHECK: store i32 %[[cvt]], ptr %[[b2:.*]],
 101   //   CHECK: store ptr %[[b2]], ptr %[[b2ref:.*]],
 102
 103   return b2;
 104   // CHECK: %[[b2:.*]] = load ptr, ptr %[[b2ref]]
 105   // CHECK: load i32, ptr %[[b2]]
 106
 107   // CHECK: call {{.*}}@_ZN1XD1Ev({{.*}}%[[b1]])
 108 }
 109
 110 // CHECK: define{{.*}} void @_Z13test_bitfieldR1A(
 111 void test_bitfield(A &a) {
 112   auto &[a1, a2] = a;
 113   a1 = 5;
 114   // CHECK: load i16, ptr %[[BITFIELD:.*]],
 115   // CHECK: and i16 %{{.*}}, -8192
 116   // CHECK: or i16 %{{.*}}, 5
 117   // CHECK: store i16 %{{.*}}, ptr %[[BITFIELD]],
 118 }
 119
 120 // CHECK-LABEL: define {{.*}}@_Z18test_static_simple
 121 void test_static_simple() {
 122   static auto [x1, x2] = make<A>();
 123   // CHECK: load atomic i8, {{.*}}@_ZGVZ18test_static_simplevEDC2x12x2E{{.*}} acquire, align 8
 124   // CHECK: br i1
 125   // CHECK: @__cxa_guard_acquire(
 126   // CHECK: call {{.*}} @_Z4makeI1AERT_v(
 127   // CHECK: memcpy{{.*}} @_ZZ18test_static_simplevEDC2x12x2E
 128   // CHECK: @__cxa_guard_release(
 129 }
 130
 131 // CHECK-LABEL: define {{.*}}@_Z17test_static_tuple
 132 int test_static_tuple() {
 133   // Note that the desugaring specified for this construct requires three
 134   // separate guarded initializations. It is possible for an exception to be
 135   // thrown after the first initialization and before the second, and if that
 136   // happens, we are not permitted to rerun the first initialization, so we
 137   // can't combine these into a single guarded initialization in general.
 138   static auto [x1, x2] = make<B>();
 139
 140   // Initialization of the implied variable.
 141   // CHECK: load atomic i8, {{.*}}@_ZGVZ17test_static_tuplevEDC2x12x2E{{.*}} acquire, align 8
 142   // CHECK: br i1
 143   // CHECK: @__cxa_guard_acquire({{.*}} @_ZGVZ17test_static_tuplevEDC2x12x2E)
 144   // CHECK: call {{.*}} @_Z4makeI1BERT_v(
 145   // CHECK: @__cxa_guard_release({{.*}} @_ZGVZ17test_static_tuplevEDC2x12x2E)
 146
 147   // Initialization of the secret 'x1' variable.
 148   // CHECK: load atomic i8, {{.*}}@_ZGVZ17test_static_tuplevE2x1{{.*}} acquire, align 8
 149   // CHECK: br i1
 150   // CHECK: @__cxa_guard_acquire({{.*}} @_ZGVZ17test_static_tuplevE2x1)
 151   // CHECK: call {{.*}} @_Z3getILi0EEDa1B(
 152   // CHECK: call {{.*}} @_ZN1XC1E1Y({{.*}} @_ZGRZ17test_static_tuplevE2x1_,
 153   // CHECK: call {{.*}} @__cxa_atexit({{.*}} @_ZN1XD1Ev, {{.*}} @_ZGRZ17test_static_tuplevE2x1_
 154   // CHECK: store {{.*}} @_ZGRZ17test_static_tuplevE2x1_, {{.*}} @_ZZ17test_static_tuplevE2x1
 155   // CHECK: call void @__cxa_guard_release({{.*}} @_ZGVZ17test_static_tuplevE2x1)
 156
 157   // Initialization of the secret 'x2' variable.
 158   // CHECK: load atomic i8, {{.*}}@_ZGVZ17test_static_tuplevE2x2{{.*}} acquire, align 8
 159   // CHECK: br i1
 160   // CHECK: @__cxa_guard_acquire({{.*}} @_ZGVZ17test_static_tuplevE2x2)
 161   // CHECK: call {{.*}} @_Z3getILi1EEDa1B(
 162   // CHECK: store {{.*}}, {{.*}} @_ZGRZ17test_static_tuplevE2x2_
 163   // CHECK: store {{.*}} @_ZGRZ17test_static_tuplevE2x2_, {{.*}} @_ZZ17test_static_tuplevE2x2
 164   // CHECK: call void @__cxa_guard_release({{.*}} @_ZGVZ17test_static_tuplevE2x2)
 165
 166   struct Inner {
 167     // CHECK-LABEL: define {{.*}}@_ZZ17test_static_tuplevEN5Inner1fEv(
 168     // FIXME: This first load should be constant-folded to the _ZGV... temporary.
 169     // CHECK: load {{.*}} @_ZZ17test_static_tuplevE2x2
 170     // CHECK: load
 171     // CHECK: ret
 172     int f() { return x2; }
 173   };
 174   return Inner().f();
 175 }