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improve and deduplicate comments

This commit is contained in:
Ralf Jung 2019-07-02 12:51:00 +02:00
parent 2bad604587
commit 576369bfce
1 changed files with 3 additions and 4 deletions
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7
src/libstd/sys/unix/alloc.rs
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@ -9,7 +9,8 @@ unsafe impl GlobalAlloc for System {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
// jemalloc provides alignment less than MIN_ALIGN for small allocations.
// So only rely on MIN_ALIGN if size >= align.
// Also see <https://github.com/rust-lang/rust/issues/45955>.
// Also see <https://github.com/rust-lang/rust/issues/45955> and
// <https://github.com/rust-lang/rust/issues/62251#issuecomment-507580914>.
if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
libc::malloc(layout.size()) as *mut u8
} else {
@ -25,9 +26,7 @@ unsafe impl GlobalAlloc for System {
#[inline]
unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
// jemalloc provides alignment less than MIN_ALIGN for small allocations.
// So only rely on MIN_ALIGN if size >= align.
// Also see <https://github.com/rust-lang/rust/issues/45955>.
// See the comment above in `alloc` for why this check looks the way it does.
if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
libc::calloc(layout.size(), 1) as *mut u8
} else {