clang/test/CXX/drs/cwg158.cpp

   1 // RUN: %clang_cc1 -triple x86_64-linux -std=c++98 %s -O3 -disable-llvm-passes -pedantic-errors -emit-llvm -o - | FileCheck %s
   2 // RUN: %clang_cc1 -triple x86_64-linux -std=c++11 %s -O3 -disable-llvm-passes -pedantic-errors -emit-llvm -o - | FileCheck %s
   3 // RUN: %clang_cc1 -triple x86_64-linux -std=c++14 %s -O3 -disable-llvm-passes -pedantic-errors -emit-llvm -o - | FileCheck %s
   4 // RUN: %clang_cc1 -triple x86_64-linux -std=c++1z %s -O3 -disable-llvm-passes -pedantic-errors -emit-llvm -o - | FileCheck %s
   5
   6 // cwg158: yes
   7
   8 // CHECK-LABEL: define {{.*}} @_Z1f
   9 const int *f(const int * const *p, int **q) {
  10   // CHECK: load ptr, {{.*}}, !tbaa ![[INTPTR_TBAA:[^,]*]]
  11   const int *x = *p;
  12   // CHECK: store ptr null, {{.*}}, !tbaa ![[INTPTR_TBAA]]
  13   *q = 0;
  14   return x;
  15 }
  16
  17 struct A {};
  18
  19 // CHECK-LABEL: define {{.*}} @_Z1g
  20 const int *(A::*const *g(const int *(A::* const **p)[3], int *(A::***q)[3]))[3] {
  21   // CHECK: load ptr, {{.*}}, !tbaa ![[MEMPTR_TBAA:[^,]*]]
  22   const int *(A::*const *x)[3] = *p;
  23   // CHECK: store ptr null, {{.*}}, !tbaa ![[MEMPTR_TBAA]]
  24   *q = 0;
  25   return x;
  26 }
  27