53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
// RUN: %clang_cc1 -emit-llvm -triple x86_64-apple-darwin10 < %s | FileCheck %s
|
|
|
|
struct Test1S {
|
|
long NumDecls;
|
|
long X;
|
|
long Y;
|
|
};
|
|
struct Test2S {
|
|
long NumDecls;
|
|
long X;
|
|
};
|
|
|
|
// Make sure we don't generate extra memcpy for lvalues
|
|
void test1a(struct Test1S, struct Test2S);
|
|
// CHECK-LABEL: define void @test1(
|
|
// CHECK-NOT: memcpy
|
|
// CHECK: call void @test1a
|
|
void test1(struct Test1S *A, struct Test2S *B) {
|
|
test1a(*A, *B);
|
|
}
|
|
|
|
// The above gets tricker when the byval argument requires higher alignment
|
|
// than the natural alignment of the type in question.
|
|
// rdar://9483886
|
|
|
|
// Make sure we do generate a memcpy when we cannot guarantee alignment.
|
|
struct Test3S {
|
|
int a,b,c,d,e,f,g,h,i,j,k,l;
|
|
};
|
|
void test2a(struct Test3S q);
|
|
// CHECK-LABEL: define void @test2(
|
|
// CHECK: alloca %struct.Test3S, align 8
|
|
// CHECK: memcpy
|
|
// CHECK: call void @test2a
|
|
void test2(struct Test3S *q) {
|
|
test2a(*q);
|
|
}
|
|
|
|
// But make sure we don't generate a memcpy when we can guarantee alignment.
|
|
void fooey(void);
|
|
// CHECK-LABEL: define void @test3(
|
|
// CHECK: alloca %struct.Test3S, align 8
|
|
// CHECK: call void @fooey
|
|
// CHECK-NOT: memcpy
|
|
// CHECK: call void @test2a
|
|
// CHECK-NOT: memcpy
|
|
// CHECK: call void @test2a
|
|
void test3(struct Test3S a) {
|
|
struct Test3S b = a;
|
|
fooey();
|
|
test2a(a);
|
|
test2a(b);
|
|
}
|