clang/test/CodeGen/transparent-union-redecl.c

   1 // RUN: %clang_cc1 -Werror -triple i386-linux -Wno-strict-prototypes -emit-llvm -o - %s | FileCheck %s
   2
   3 // Test that different order of declarations is acceptable and that
   4 // implementing different redeclarations is acceptable.
   5
   6 typedef union {
   7   int i;
   8   float f;
   9 } TU __attribute__((transparent_union));
  10
  11 // CHECK-LABEL: define{{.*}} void @f0(i32 %tu.coerce)
  12 // CHECK: %tu = alloca %union.TU, align 4
  13 // CHECK: %coerce.dive = getelementptr inbounds nuw %union.TU, ptr %tu, i32 0, i32 0
  14 // CHECK: store i32 %tu.coerce, ptr %coerce.dive, align 4
  15 void f0(TU tu) {}
  16 void f0(int i);
  17
  18 // CHECK-LABEL: define{{.*}} void @f1(i32 noundef %tu.coerce)
  19 // CHECK: %tu = alloca %union.TU, align 4
  20 // CHECK: %coerce.dive = getelementptr inbounds nuw %union.TU, ptr %tu, i32 0, i32 0
  21 // CHECK: store i32 %tu.coerce, ptr %coerce.dive, align 4
  22 void f1(int i);
  23 void f1(TU tu) {}
  24
  25 // CHECK-LABEL: define{{.*}} void @f2(i32 noundef %i)
  26 // CHECK: %i.addr = alloca i32, align 4
  27 // CHECK: store i32 %i, ptr %i.addr, align 4
  28 void f2(TU tu);
  29 void f2(int i) {}
  30
  31 // CHECK-LABEL: define{{.*}} void @f3(i32 noundef %i)
  32 // CHECK: %i.addr = alloca i32, align 4
  33 // CHECK: store i32 %i, ptr %i.addr, align 4
  34 void f3(int i) {}
  35 void f3(TU tu);
  36
  37 // Also test functions with parameters specified K&R style.
  38 // CHECK-LABEL: define{{.*}} void @knrStyle(i32 noundef %tu.coerce)
  39 // CHECK: %tu = alloca %union.TU, align 4
  40 // CHECK: %coerce.dive = getelementptr inbounds nuw %union.TU, ptr %tu, i32 0, i32 0
  41 // CHECK: store i32 %tu.coerce, ptr %coerce.dive, align 4
  42 void knrStyle(int i);
  43 void knrStyle(tu) TU tu; {}