| 1 | // RUN: %clang_cc1 -emit-llvm -triple x86_64-apple-darwin10 < %s | FileCheck %s |
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| 2 | |
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| 3 | struct Test1S { |
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| 4 | long NumDecls; |
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| 5 | long X; |
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| 6 | long Y; |
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| 7 | }; |
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| 8 | struct Test2S { |
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| 9 | long NumDecls; |
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| 10 | long X; |
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| 11 | }; |
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| 12 | |
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| 13 | // Make sure we don't generate extra memcpy for lvalues |
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| 14 | void test1a(struct Test1S, struct Test2S); |
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| 15 | // CHECK-LABEL: define void @test1( |
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| 16 | // CHECK-NOT: memcpy |
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| 17 | // CHECK: call void @test1a |
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| 18 | void test1(struct Test1S *A, struct Test2S *B) { |
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| 19 | test1a(*A, *B); |
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| 20 | } |
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| 21 | |
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| 22 | // The above gets tricker when the byval argument requires higher alignment |
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| 23 | // than the natural alignment of the type in question. |
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| 24 | // rdar://9483886 |
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| 25 | |
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| 26 | // Make sure we do generate a memcpy when we cannot guarantee alignment. |
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| 27 | struct Test3S { |
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| 28 | int a,b,c,d,e,f,g,h,i,j,k,l; |
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| 29 | }; |
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| 30 | void test2a(struct Test3S q); |
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| 31 | // CHECK-LABEL: define void @test2( |
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| 32 | // CHECK: alloca %struct.Test3S, align 8 |
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| 33 | // CHECK: memcpy |
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| 34 | // CHECK: call void @test2a |
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| 35 | void test2(struct Test3S *q) { |
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| 36 | test2a(*q); |
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| 37 | } |
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| 38 | |
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| 39 | // But make sure we don't generate a memcpy when we can guarantee alignment. |
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| 40 | void fooey(void); |
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| 41 | // CHECK-LABEL: define void @test3( |
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| 42 | // CHECK: alloca %struct.Test3S, align 8 |
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| 43 | // CHECK: call void @fooey |
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| 44 | // CHECK-NOT: memcpy |
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| 45 | // CHECK: call void @test2a |
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| 46 | // CHECK-NOT: memcpy |
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| 47 | // CHECK: call void @test2a |
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| 48 | void test3(struct Test3S a) { |
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| 49 | struct Test3S b = a; |
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| 50 | fooey(); |
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| 51 | test2a(a); |
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| 52 | test2a(b); |
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| 53 | } |
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| 54 | |
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