Dylan DPC fe4200365e Rollup merge of #102760 - saethlin:dont-reinit-buffer, r=Mark-Simulacrum ...

Avoid repeated re-initialization of the BufReader buffer

Fixes https://github.com/rust-lang/rust/issues/102727

We accidentally removed this in https://github.com/rust-lang/rust/pull/98748. It looks so redundant. But it isn't.

The default `Read::read_buf` will defensively initialize the whole buffer, if any of it is indicated to be uninitialized. In uses where reads from the wrapped `Read` impl completely fill the `BufReader`, `initialized` and `filled` are the same, and this extra member isn't required. But in the reported issue, the `BufReader` wraps a `Read` impl which will _never_ fill the whole buffer. So the default `Read::read_buf` implementation repeatedly re-initializes the extra space in the buffer.

This adds back the extra `initialized` member, which ensures that the default `Read::read_buf` only zero-initialized the buffer once, and I've tried to add a comment which explains this whole situation.

2022-10-07 22:05:31 +05:30

..

benches

…

primitive_docs

Add primitive documentation to libcore

2021-09-12 02:23:08 +00:00

src

Rollup merge of #102760 - saethlin:dont-reinit-buffer, r=Mark-Simulacrum

2022-10-07 22:05:31 +05:30

tests

Fold aarch64 feature +fp into +neon

2022-03-22 15:14:33 -07:00

build.rs

Library changes for Apple WatchOS

2022-07-20 08:57:36 +01:00

Cargo.toml

Update stdarch

2022-09-15 13:05:28 -04:00