| 1 | // RUN: %clang_cc1 -triple i386-pc-elfiamcu -emit-llvm %s -o - | FileCheck %s |
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| 2 | |
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| 3 | // Structure that is more than 8 byte. |
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| 4 | struct Big { |
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| 5 | double a[10]; |
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| 6 | }; |
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| 7 | |
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| 8 | // Empty union with zero size must be returned as void. |
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| 9 | union U1 { |
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| 10 | } u1; |
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| 11 | |
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| 12 | // Too large union (80 bytes) must be returned via memory. |
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| 13 | union U2 { |
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| 14 | struct Big b; |
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| 15 | } u2; |
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| 16 | |
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| 17 | // Must be returned in register. |
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| 18 | union U3 { |
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| 19 | int x; |
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| 20 | } u3; |
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| 21 | |
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| 22 | // Empty struct with zero size, must be returned as void. |
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| 23 | struct S1 { |
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| 24 | } s1; |
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| 25 | |
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| 26 | // Must be returend in register. |
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| 27 | struct S2 { |
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| 28 | int x; |
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| 29 | } s2; |
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| 30 | |
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| 31 | // CHECK: [[UNION1_TYPE:%.+]] = type {} |
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| 32 | // CHECK: [[UNION2_TYPE:%.+]] = type { [[STRUCT_TYPE:%.+]] } |
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| 33 | // CHECK: [[STRUCT_TYPE]] = type { [10 x double] } |
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| 34 | // CHECK: [[UNION3_TYPE:%.+]] = type { i32 } |
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| 35 | // CHECK: [[STRUCT1_TYPE:%.+]] = type {} |
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| 36 | // CHECK: [[STRUCT2_TYPE:%.+]] = type { i32 } |
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| 37 | |
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| 38 | union U1 foo1() { return u1; } |
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| 39 | union U2 foo2() { return u2; } |
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| 40 | union U3 foo3() { return u3; } |
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| 41 | struct S1 bar1() { return s1; } |
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| 42 | struct S2 bar2() { return s2; } |
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| 43 | struct S1 bar3(union U1 u) { return s1; } |
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| 44 | // CHECK: define void @foo1() |
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| 45 | // CHECK: define void @foo2([[UNION2_TYPE]]* noalias sret %{{.+}}) |
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| 46 | // CHECK: define i32 @foo3() |
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| 47 | // CHECK: define void @bar1() |
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| 48 | // CHECK: define i32 @bar2() |
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| 49 | // CHECK: define void @bar3() |
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| 50 | |
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| 51 | void run() { |
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| 52 | union U1 x1 = foo1(); |
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| 53 | union U2 x2 = foo2(); |
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| 54 | union U3 x3 = foo3(); |
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| 55 | struct S1 y1 = bar1(); |
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| 56 | struct S2 y2 = bar2(); |
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| 57 | struct S1 y3 = bar3(x1); |
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| 58 | |
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| 59 | // CHECK: [[X1:%.+]] = alloca [[UNION1_TYPE]] |
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| 60 | // CHECK: [[X2:%.+]] = alloca [[UNION2_TYPE]] |
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| 61 | // CHECK: [[X3:%.+]] = alloca [[UNION3_TYPE]] |
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| 62 | // CHECK: [[Y1:%.+]] = alloca [[STRUCT1_TYPE]] |
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| 63 | // CHECK: [[Y2:%.+]] = alloca [[STRUCT2_TYPE]] |
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| 64 | // CHECK: call void @foo1() |
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| 65 | // CHECK: call void @foo2([[UNION2_TYPE]]* sret [[X2]]) |
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| 66 | // CHECK: {{.+}} = call i32 @foo3() |
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| 67 | // CHECK: call void @bar1() |
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| 68 | // CHECK: {{.+}} = call i32 @bar2() |
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| 69 | // CHECK: call void @bar3() |
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| 70 | } |
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| 71 | |
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