| 1 | // For MSVC ABI compatibility, all structures returned by value using the |
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| 2 | // thiscall calling convention must use the hidden parameter. |
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| 3 | // |
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| 4 | // RUN: %clang_cc1 -triple i386-PC-Win32 %s -fms-compatibility -emit-llvm -o - | FileCheck %s |
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| 5 | |
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| 6 | // This structure would normally be returned via EAX |
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| 7 | struct S { |
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| 8 | int i; |
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| 9 | }; |
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| 10 | |
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| 11 | // This structure would normally be returned via EAX/EDX |
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| 12 | struct M { |
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| 13 | int i; |
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| 14 | int j; |
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| 15 | }; |
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| 16 | |
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| 17 | class C { |
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| 18 | public: |
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| 19 | C() {} |
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| 20 | |
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| 21 | struct S __attribute__((thiscall)) Small() const { |
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| 22 | struct S s = { 0 }; |
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| 23 | return s; |
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| 24 | } |
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| 25 | |
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| 26 | struct M __attribute__((thiscall)) Medium() const { |
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| 27 | struct M m = { 0 }; |
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| 28 | return m; |
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| 29 | } |
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| 30 | }; |
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| 31 | |
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| 32 | // CHECK-LABEL: define void @_Z4testv() |
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| 33 | void test( void ) { |
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| 34 | // CHECK: call void @_ZN1CC1Ev(%class.C* [[C:%.+]]) |
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| 35 | C c; |
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| 36 | |
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| 37 | // CHECK: call x86_thiscallcc void @_ZNK1C5SmallEv(%struct.S* sret %{{.+}}, %class.C* [[C]]) |
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| 38 | (void)c.Small(); |
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| 39 | // CHECK: call x86_thiscallcc void @_ZNK1C6MediumEv(%struct.M* sret %{{.+}}, %class.C* [[C]]) |
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| 40 | (void)c.Medium(); |
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| 41 | } |
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| 42 | |
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