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std: Mark Layout::repeat as #[inline] #43513

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Jul 30, 2017
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std: Mark Layout::repeat as #[inline] #43513

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1 change: 1 addition & 0 deletions src/liballoc/allocator.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -207,6 +207,7 @@ impl Layout {
/// of each element in the array.
///
/// On arithmetic overflow, returns `None`.
#[inline]
pub fn repeat(&self, n: usize) -> Option<(Self, usize)> {
let padded_size = match self.size.checked_add(self.padding_needed_for(self.align)) {
None => return None,
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21 changes: 21 additions & 0 deletions src/test/codegen/vec-optimizes-away.rs
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@@ -0,0 +1,21 @@
// Copyright 2017 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.
//
// no-system-llvm
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Does this not work on system LLVMs? Is it the typical behavior where LLVM doesn't recognize our allocation functions?

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Yeah unfortunately only our LLVM sees our allocation functions.

// compile-flags: -O
#![crate_type="lib"]

#[no_mangle]
pub fn sum_me() -> i32 {
// CHECK-LABEL: @sum_me
// CHECK-NEXT: {{^.*:$}}
// CHECK-NEXT: ret i32 6
vec![1, 2, 3].iter().sum::<i32>()
}