| Daniel Sanders | 998c910 | 2015-01-14 12:00:12 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -triple mips64-linux-gnu -S -o - -emit-llvm %s | FileCheck %s |
| 2 | // |
| 3 | // Transparent unions are passed according to the calling convention rules of |
| 4 | // the first member. In this case, it is as if it were a void pointer so we |
| 5 | // do not have the inreg attribute we would normally have for unions. |
| 6 | // |
| 7 | // This comes up in glibc's wait() function and matters for the big-endian N32 |
| 8 | // case where pointers are promoted to i64 and a non-transparent union would be |
| 9 | // passed in the upper 32-bits of an i64. |
| 10 | |
| 11 | union either_pointer { |
| 12 | void *void_ptr; |
| 13 | int *int_ptr; |
| 14 | } __attribute__((transparent_union)); |
| 15 | |
| 16 | extern void foo(union either_pointer p); |
| 17 | |
| 18 | int data; |
| 19 | |
| 20 | void bar(void) { |
| 21 | return foo(&data); |
| 22 | } |
| 23 | |
| 24 | // CHECK-LABEL: define void @bar() |
| 25 | // CHECK: call void @foo(i8* %{{[0-9]+}}) |
| 26 | |
| 27 | // CHECK: declare void @foo(i8*) |