| //@ compile-flags: -C no-prepopulate-passes -Copt-level=0 |
| |
| #![crate_type = "lib"] |
| |
| // Hack to get the correct size for the length part in slices |
| // CHECK: @helper([[USIZE:i[0-9]+]] %_1) |
| #[no_mangle] |
| pub fn helper(_: usize) {} |
| |
| // CHECK-LABEL: @no_op_slice_adjustment |
| #[no_mangle] |
| pub fn no_op_slice_adjustment(x: &[u8]) -> &[u8] { |
| // We used to generate an extra alloca and memcpy for the block's trailing expression value, so |
| // check that we copy directly to the return value slot |
| // CHECK: %0 = insertvalue { ptr, [[USIZE]] } poison, ptr %x.0, 0 |
| // CHECK: %1 = insertvalue { ptr, [[USIZE]] } %0, [[USIZE]] %x.1, 1 |
| // CHECK: ret { ptr, [[USIZE]] } %1 |
| { x } |
| } |
| |
| // CHECK-LABEL: @no_op_slice_adjustment2 |
| #[no_mangle] |
| pub fn no_op_slice_adjustment2(x: &[u8]) -> &[u8] { |
| // We used to generate an extra alloca and memcpy for the function's return value, so check |
| // that there's no memcpy (the slice is written to sret_slot element-wise) |
| // CHECK-NOT: call void @llvm.memcpy. |
| no_op_slice_adjustment(x) |
| } |
