| // RUN: %clang_cc1 -triple mips64-linux-gnu -S -o - -emit-llvm %s | FileCheck %s |
| // |
| // Transparent unions are passed according to the calling convention rules of |
| // the first member. In this case, it is as if it were a void pointer so we |
| // do not have the inreg attribute we would normally have for unions. |
| // |
| // This comes up in glibc's wait() function and matters for the big-endian N32 |
| // case where pointers are promoted to i64 and a non-transparent union would be |
| // passed in the upper 32-bits of an i64. |
| |
| union either_pointer { |
| void *void_ptr; |
| int *int_ptr; |
| } __attribute__((transparent_union)); |
| |
| extern void foo(union either_pointer p); |
| |
| int data; |
| |
| void bar(void) { |
| return foo(&data); |
| } |
| |
| // CHECK-LABEL: define void @bar() |
| // CHECK: call void @foo(i8* %{{[0-9]+}}) |
| |
| // CHECK: declare void @foo(i8*) |