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Rollup merge of #54773 - rust-lang:wesleywiser-patch-1, r=oli-obk

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Update a FIXME in memory.rs

In  #51833, I improved the performance of `copy_undef_mask()`. As such, the old FIXME wasn't appropriate anymore. The main remaining thing left to do is to implement a fast path for non-overlapping copies (per @oli-obk).

r? @oli-obk
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Pietro Albini 2018-10-04 12:20:11 +02:00 • committed by GitHub
commit 2fda2f6f13
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src/librustc_mir/interpret/memory.rs
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@ -971,7 +971,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> Memory<'a, 'mir, 'tcx, M> {
/// Undefined bytes
impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> Memory<'a, 'mir, 'tcx, M> {
// FIXME(solson): This is a very naive, slow version.
// FIXME: Add a fast version for the common, nonoverlapping case
fn copy_undef_mask(
&mut self,
src: Pointer,