clang/test/CodeGenCXX/lambda-deterministic-captures.cpp

   1 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm --std=c++17 %s -o - | FileCheck %s
   2
   3 struct stream {
   4   friend const stream &operator<<(const stream &, const float &);
   5 };
   6
   7 void foo() {
   8   constexpr float f_zero = 0.0f;
   9   constexpr float f_one = 1.0f;
  10   constexpr float f_two = 2.0f;
  11
  12   stream s;
  13   [=]() {
  14     s << f_zero << f_one << f_two;
  15   }();
  16 }
  17
  18 // CHECK: define{{.*}} void @_Z3foov
  19 // CHECK: getelementptr inbounds %{{.+}}, %{{.+}}* %{{.+}}, i32 0, i32 0
  20 // CHECK-NEXT: getelementptr inbounds %{{.+}}, %{{.+}}* %{{.+}}, i32 0, i32 1
  21 // CHECK-NEXT: store float 0.000
  22 // CHECK-NEXT: getelementptr inbounds %{{.+}}, %{{.+}}* %{{.+}}, i32 0, i32 2
  23 // CHECK-NEXT: store float 1.000
  24 // CHECK-NEXT: getelementptr inbounds %{{.+}}, %{{.+}}* %{{.+}}, i32 0, i32 3
  25 // CHECK-NEXT: store float 2.000
  26
  27 // The lambda body.  Reverse iteration when the captures aren't deterministic
  28 // causes these to be laid out differently in the lambda.
  29 // CHECK: define internal void
  30 // CHECK: getelementptr inbounds %{{.+}}, %{{.+}}* %{{.+}}, i32 0, i32 0
  31 // CHECK: getelementptr inbounds %{{.+}}, %{{.+}}* %{{.+}}, i32 0, i32 1
  32 // CHECK: getelementptr inbounds %{{.+}}, %{{.+}}* %{{.+}}, i32 0, i32 2
  33 // CHECK: getelementptr inbounds %{{.+}}, %{{.+}}* %{{.+}}, i32 0, i32 3