1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // compile-flags: -C no-prepopulate-passes
12 // ignore-tidy-linelength
14 #![crate_type = "lib"]
16 // Hack to get the correct size for the length part in slices
17 // CHECK: @helper([[USIZE:i[0-9]+]] %arg0)
19 pub fn helper(_: usize) {
22 // CHECK-LABEL: @no_op_slice_adjustment
24 pub fn no_op_slice_adjustment(x: &[u8]) -> &[u8] {
25 // We used to generate an extra alloca and memcpy for the block's trailing expression value, so
26 // check that we copy directly to the return value slot
27 // CHECK: %0 = insertvalue { [0 x i8]*, [[USIZE]] } undef, [0 x i8]* %x.0, 0
28 // CHECK: %1 = insertvalue { [0 x i8]*, [[USIZE]] } %0, [[USIZE]] %x.1, 1
29 // CHECK: ret { [0 x i8]*, [[USIZE]] } %1
33 // CHECK-LABEL: @no_op_slice_adjustment2
35 pub fn no_op_slice_adjustment2(x: &[u8]) -> &[u8] {
36 // We used to generate an extra alloca and memcpy for the function's return value, so check
37 // that there's no memcpy (the slice is written to sret_slot element-wise)
38 // CHECK-NOT: call void @llvm.memcpy.
39 no_op_slice_adjustment(x)