Improve zerofill in Vec::resize and Read::read_to_end
We needed a more efficient way to zerofill the vector in read_to_end.
This to reduce the memory intialization overhead to a minimum.
Use the implementation of `std::vec::from_elem` (used for the vec![]
macro) for Vec::resize as well. For simple element types like u8, this
compiles to memset, so it makes Vec::resize much more efficient.
Use the vec![] macro directly to create a sized, zeroed vector.
This should result in a big speedup when creating BufReader, because
vec![0; cap] compiles to a memset call, while the previous extend code
currently did not.
We needed a more efficient way to zerofill the vector in read_to_end.
This to reduce the memory intialization overhead to a minimum.
Use the implementation of `std::vec::from_elem` (used for the vec![]
macro) for Vec::resize as well. For simple element types like u8, this
compiles to memset, so it makes Vec::resize much more efficient.
This reverts https://github.com/rust-lang/rust/pull/26599, which puts the stage number in the output of `--version -v`, but is not supposed to put it in the 'stage2' compiler, which is what most people refer to the binary we deploy.
The picture is not so clear though because of how stage 'promotions' happen in the build and also because the windows build deploys stage3, not stage2.
cc @richo
I am not mentioning #[unsafe_drop_flag] because it should go away
eventually, and also because it's just an attribute, it's not
really a use of the `unsafe` keyword.
Fixes#26345
I am not mentioning #[unsafe_drop_flag] because it should go away
eventually, and also because it's just an attribute, it's not
really a use of the `unsafe` keyword.
Fixes#26345
This will add information about the stage that a rustc was built with to the verbose version info
I have symlinks into $(HOST)/stage{0,1,2} into the rust version switcher thing I use, and occasionally need to know which stage a given rustc is.
Each formatting trait now has an example of implementation, as well as a
fuller description of what it's supposed to output.
It also contains a link to the module-level documentation which
Fixes#25765
This will add information about the stage that a rustc was built with to the verbose version info
I have symlinks into $(HOST)/stage{0,1,2} into the rust version switcher thing I use, and occasionally need to know which stage a given rustc is.
Each formatting trait now has an example of implementation, as well as a
fuller description of what it's supposed to output.
It also contains a link to the module-level documentation which
Fixes#25765
the indentation has always been a thorn in my eye.
If it's preferred I'll leave the `unsafe` where it was and change it to
```rust
unsafe { match e.node {
...
} } // unsafe { match e.node {
```
so there's no unnecessary indent
