| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // compile-flags: -C no-prepopulate-passes |
| |
| #![crate_type = "lib"] |
| |
| // Hack to get the correct size for the length part in slices |
| // CHECK: @helper([[USIZE:i[0-9]+]]) |
| #[no_mangle] |
| 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: %2 = insertvalue { i8*, [[USIZE]] } undef, i8* %0, 0 |
| // CHECK: %3 = insertvalue { i8*, [[USIZE]] } %2, [[USIZE]] %1, 1 |
| // CHECK: ret { i8*, [[USIZE]] } %3 |
| { 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) |
| } |
