clang/test/CodeGenCXX/defaulted_equality_ignore_unnamed_bitfields.cpp

   1 // RUN: %clang_cc1 -std=c++20 %s -triple x86_64-linux -emit-llvm -o - | FileCheck %s
   2
   3 // GH61417
   4 // Check that we don't attempt to compare the unnamed bitfields
   5 struct A {
   6   unsigned x : 1;
   7   unsigned   : 1;
   8
   9   friend bool operator==(A, A);
  10 };
  11
  12
  13 struct B {
  14   unsigned x : 1;
  15   unsigned   : 31;
  16
  17   friend bool operator==(B, B);
  18 };
  19
  20 bool operator==(A, A) = default;
  21 // CHECK: define{{.*}} @_Zeq1AS_
  22 // CHECK: %[[LHS:.+]] = alloca %struct.A, align 4
  23 // CHECK: %[[RHS:.+]] = alloca %struct.A, align 4
  24 // CHECK: %[[LHS_LOAD:.+]] = load i8, ptr %[[LHS]], align 4
  25 // CHECK: %[[LHS_CLEAR:.+]] = and i8 %[[LHS_LOAD]], 1
  26 // CHECK: %[[LHS_CAST:.+]] = zext i8 %[[LHS_CLEAR]] to i32
  27
  28 // CHECK: %[[RHS_LOAD:.+]] = load i8, ptr %[[RHS]]
  29 // CHECK: %[[RHS_CLEAR:.+]] = and i8 %[[RHS_LOAD]], 1
  30 // CHECK: %[[RHS_CAST:.+]] = zext i8 %[[RHS_CLEAR]] to i32
  31 // CHECK: %[[CMP:.*]] = icmp eq i32 %[[LHS_CAST]], %[[RHS_CAST]]
  32 // CHECK: ret i1 %[[CMP]]
  33
  34 bool operator==(B, B) = default;
  35 // CHECK: define{{.*}} @_Zeq1BS_
  36 // CHECK: %[[LHS_B:.+]] = alloca %struct.B, align 4
  37 // CHECK: %[[RHS_B:.+]] = alloca %struct.B, align 4
  38 // CHECK: %[[LHS_LOAD_B:.+]] = load i32, ptr %[[LHS_B]], align 4
  39 // CHECK: %[[LHS_CLEAR_B:.+]] = and i32 %[[LHS_LOAD_B]], 1
  40
  41 // CHECK: %[[RHS_LOAD_B:.+]] = load i32, ptr %[[RHS_B]]
  42 // CHECK: %[[RHS_CLEAR_B:.+]] = and i32 %[[RHS_LOAD_B]], 1
  43 // CHECK: %[[CMP_B:.*]] = icmp eq i32 %[[LHS_CLEAR_B]], %[[RHS_CLEAR_B]]
  44 // CHECK: ret i1 %[[CMP_B]]