| 1 | // RUN: %clang_cc1 -triple mips64-linux-gnu -S -o - -emit-llvm %s | FileCheck %s |
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| 2 | // |
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| 3 | // Transparent unions are passed according to the calling convention rules of |
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| 4 | // the first member. In this case, it is as if it were a void pointer so we |
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| 5 | // do not have the inreg attribute we would normally have for unions. |
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| 6 | // |
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| 7 | // This comes up in glibc's wait() function and matters for the big-endian N32 |
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| 8 | // case where pointers are promoted to i64 and a non-transparent union would be |
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| 9 | // passed in the upper 32-bits of an i64. |
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| 10 | |
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| 11 | union either_pointer { |
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| 12 | void *void_ptr; |
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| 13 | int *int_ptr; |
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| 14 | } __attribute__((transparent_union)); |
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| 15 | |
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| 16 | extern void foo(union either_pointer p); |
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| 17 | |
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| 18 | int data; |
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| 19 | |
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| 20 | void bar(void) { |
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| 21 | return foo(&data); |
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| 22 | } |
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| 23 | |
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| 24 | // CHECK-LABEL: define void @bar() |
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| 25 | // CHECK: call void @foo(i8* %{{[0-9]+}}) |
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| 26 | |
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| 27 | // CHECK: declare void @foo(i8*) |
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| 28 | |
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