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
13 #![crate_type = "lib"]
15 // Hack to get the correct size for the length part in slices
16 // CHECK: @helper([[USIZE:i[0-9]+]])
21 // CHECK-LABEL: @no_op_slice_adjustment
23 pub fn no_op_slice_adjustment(x: &[u8]) -> &[u8] {
24 // We used to generate an extra alloca and memcpy for the block's trailing expression value, so
25 // check that we copy directly to the return value slot
26 // CHECK: [[SRC:%[0-9]+]] = bitcast { i8*, [[USIZE]] }* %x to
27 // CHECK: [[DST:%[0-9]+]] = bitcast { i8*, [[USIZE]] }* %sret_slot to i8*
28 // CHECK: call void @llvm.memcpy.{{.*}}(i8* [[DST]], i8* [[SRC]],
32 // CHECK-LABEL: @no_op_slice_adjustment2
34 pub fn no_op_slice_adjustment2(x: &[u8]) -> &[u8] {
35 // We used to generate an extra alloca and memcpy for the function's return value, so check
36 // that there's no memcpy (the slice is written to sret_slot element-wise)
37 // CHECK-NOT: call void @llvm.memcpy.
38 no_op_slice_adjustment(x)