openharmony/third_party_rust_encoding_rs
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Adjust README.

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Henri Sivonen
2020-11-02 09:26:31 +02:00
parent 8f76bfe675
commit b99aa60db7
2 changed files with 16 additions and 12 deletions
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Cargo.toml
+1 -1
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@@ -32,7 +32,7 @@ fast-legacy-encode = ["fast-hangul-encode",
[dependencies]
cfg-if = "0.1.0"
packed_simd = { version = "0.3.4", package = "packed_simd_2", optional = true }
packed_simd = { version = "0.3.3", optional = true }
serde = { version = "1.0", optional = true }
[dev-dependencies]
README.md
+15 -11
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@@ -144,7 +144,7 @@ There are currently these optional cargo features:
### `simd-accel`
Enables SIMD acceleration using the nightly-dependent `packed_simd` crate.
Enables SIMD acceleration using the nightly-dependent `packed_simd_2` crate.
This is an opt-in feature, because enabling this feature _opts out_ of Rust's
guarantees of future compilers compiling old code (aka. "stability story").
@@ -165,7 +165,7 @@ feature.
_Note!_ If you are compiling for a target that does not have 128-bit SIMD
enabled as part of the target definition and you are enabling 128-bit SIMD
using `-C target_feature`, you need to enable the `core_arch` Cargo feature
for `packed_simd` to compile a crates.io snapshot of `core_arch` instead of
for `packed_simd_2` to compile a crates.io snapshot of `core_arch` instead of
using the standard-library copy of `core::arch`, because the `core::arch`
module of the pre-compiled standard library has been compiled with the
assumption that the CPU doesn't have 128-bit SIMD. At present this applies
@@ -350,16 +350,15 @@ A framework for measuring performance is [available separately][2].
## Rust Version Compatibility
It is a goal to support the latest stable Rust, the latest nightly Rust and
the version of Rust that's used for Firefox Nightly (currently 1.29.0).
These are tested on Travis.
the version of Rust that's used for Firefox Nightly.
Additionally, beta and the oldest known to work Rust version (currently
1.29.0) are tested on Travis. The oldest Rust known to work is tested as
a canary so that when the oldest known to work no longer works, the change
can be documented here. At this time, there is no firm commitment to support
a version older than what's required by Firefox. The oldest supported Rust
is expected to move forward rapidly when `packed_simd` can replace the `simd`
crate without performance regression.
At this time, there is no firm commitment to support a version older than
what's required by Firefox, and there is no commitment to treat MSRV changes
as semver-breaking, because this crate depends on `cfg-if`, which doesn't
appear to treat MSRV changes as semver-breaking, so it would be useless for
this crate to treat MSRV changes as semver-breaking.
As of 2020-11-02, MSRV appears to be Rust 1.31.0.
## Compatibility with rust-encoding
@@ -422,6 +421,11 @@ To regenerate the generated code:
## Release Notes
### 0.8.25
* Do pointer alignment checks in a way where intermediate steps aren't defined to be Undefined Behavior.
* Update the `packed_simd` dependency to `packed_simd_2`.
### 0.8.24
* Avoid computing an intermediate (not dereferenced) pointer value in a manner designated as Undefined Behavior when computing pointer alignment.