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