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view relnotes/5.2 @ 44182:9896a8d0d3d2
rust-node: handling binary Node prefix
Parallel to the inner signatures of the nodetree functions in
revlog.c, we'll have to handle prefixes of `Node` in binary
form.
Another motivation is that it allows to convert from full Node
references to `NodePrefixRef` without copy. This is expected to
be by far the most common case in practice.
There's a slight complication due to the fact that we'll be sometimes
interested in prefixes with an odd number of hexadecimal digits,
which translates in binary form by a last byte in which only the
highest weight 4 bits are considered. This is totally transparent for
callers and could be revised once we have proper means to measure
performance.
The C implementation does the same, passing the length in nybbles as
function arguments. Because Rust byte slices already have a length, we carry
the even/odd informaton as a boolean, to avoid introducing logical
redundancies and the related potential inconsistency bugs.
There are a few candidates for inlining here, but we refrain from
such premature optimizations, letting the compiler decide.
Differential Revision: https://phab.mercurial-scm.org/D7790
author | Georges Racinet <georges.racinet@octobus.net> |
---|---|
date | Fri, 27 Dec 2019 23:04:18 +0100 |
parents | a825ba8eb0a1 |
children |
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== New Features == * The amend extension supports the `--currentuser` argument. * The amend extension supports the `--close-branch` argument. * The amend extension supports the `--secret` argument. * The uncommit extension supports the `rewrite.update-timestamp` config option. == New Experimental Features == == Bug Fixes == == Backwards Compatibility Changes == * A shell that supports `$(command)`` syntax for command substitution is now required for running the test suite. The test runner normally uses `sh`, so if that is a shell that doesn't support `$(command)` syntax, you can override it by setting `$HGTEST_SHELL` or by passing it to `run-tests.py --shell <shell>`. * The (experimental) narrow extension's wire protocol changed. If you're using it, you'll need to make sure to upgrade server and client at the same time. == Internal API Changes ==