[45.0.0] Add release notes

RELEASES.md

@@ -4,8 +4,130 @@ Unreleased.
 
 ### Added
 
+* Winch now respects the `enable_nan_canonicalization` setting.
+  [#12939](https://github.com/bytecodealliance/wasmtime/pull/12939)
+
+* Initial support for invoking component functions asynchronously has been added
+  to the C API.
+  [#12973](https://github.com/bytecodealliance/wasmtime/pull/12973)
+
+* Cranelift's s390x backend implements more instructions from z17 and also
+  implements more CLIF arithmetic overflow instructions.
+  [#12523](https://github.com/bytecodealliance/wasmtime/pull/12523)
+  [#12707](https://github.com/bytecodealliance/wasmtime/pull/12707)
+
+* Wasmtime's support for handling OOM in more APIs has expanded and is now
+  documented as well.
+  [#12993](https://github.com/bytecodealliance/wasmtime/pull/12993)
+  [#12988](https://github.com/bytecodealliance/wasmtime/pull/12988)
+  [#13017](https://github.com/bytecodealliance/wasmtime/pull/13017)
+  [#13047](https://github.com/bytecodealliance/wasmtime/pull/13047)
+  [#13049](https://github.com/bytecodealliance/wasmtime/pull/13049)
+  [#13051](https://github.com/bytecodealliance/wasmtime/pull/13051)
+  [#13074](https://github.com/bytecodealliance/wasmtime/pull/13074)
+  [#13083](https://github.com/bytecodealliance/wasmtime/pull/13083)
+  [#13088](https://github.com/bytecodealliance/wasmtime/pull/13088)
+  [#13224](https://github.com/bytecodealliance/wasmtime/pull/13224)
+
+* The `Component` type now offers reflection APIs over the compiled in-memory
+  view of instructions in the same manner `Module` does.
+  [#13073](https://github.com/bytecodealliance/wasmtime/pull/13073)
+
+* The `wasmtime` CLI now has a `hot-blocks` subcommand to explore a
+  `perf`-recorded output and show hot basic blocks of WebAssembly instructions.
+  [#13077](https://github.com/bytecodealliance/wasmtime/pull/13077)
+
+* Wasmtime now has an initial implementation of a copying collector for GC,
+  which notably enables collecting cycles unlike the DRC collector.
+  [#13093](https://github.com/bytecodealliance/wasmtime/pull/13093)
+  [#13107](https://github.com/bytecodealliance/wasmtime/pull/13107)
+
+* The WASI `inherit_network` and `allow_ip_name_lookup` options were added to
+  the C API.
+  [#13145](https://github.com/bytecodealliance/wasmtime/pull/13145)
+
+* The C API now has the ability to select `Winch` as well as the
+  `RegallocAlgorithm` in use.
+  [#13155](https://github.com/bytecodealliance/wasmtime/pull/13155)
+
+* The Wasmtime CLI now has a `-Dmax-backtrace=N` argument to control the number
+  of frames captured.
+  [#13218](https://github.com/bytecodealliance/wasmtime/pull/13218)
+
+* Wasmtime now tracks whether there are any active async tasks within a store
+  and provides an embedder API to learn when there are none left.
+  [#13246](https://github.com/bytecodealliance/wasmtime/pull/13246)
+
+* Cranelift now has an idempotent-store elimination pass.
+  [#13251](https://github.com/bytecodealliance/wasmtime/pull/13251)
+
 ### Changed
 
+* Wasmtime's DRC collector has received some optimizations to get some wins on
+  local benchmarking.
+  [#12969](https://github.com/bytecodealliance/wasmtime/pull/12969)
+  [#12974](https://github.com/bytecodealliance/wasmtime/pull/12974)
+
+* Wasmtime's C API can now be built without the `gc` crate feature of Wasmtime.
+  [#12805](https://github.com/bytecodealliance/wasmtime/pull/12805)
+
+* Wasmtime now has an implemented and improved grow-vs-collect heuristic to
+  improve behavior of GC-using programs.
+  [#12942](https://github.com/bytecodealliance/wasmtime/pull/12942)
+
+* Cranelift on aarch64 now uses a more optimized frame layout for tail-call-only
+  functions.
+  [#11608](https://github.com/bytecodealliance/wasmtime/pull/11608)
+
+* Wasmtime now supports a separate set of GC tunables different from the main
+  set of tunables for linear memory to enable configuring it separately.
+  [#13080](https://github.com/bytecodealliance/wasmtime/pull/13080)
+
+* Wasmtime no longer uses pointer authentication instructions for the
+  implementation of fibers due to issues on Android.
+  [#13118](https://github.com/bytecodealliance/wasmtime/pull/13118)
+
+* Wasmtime now requires Rust 1.93.0 to compile.
+  [#13127](https://github.com/bytecodealliance/wasmtime/pull/13127)
+
+* The behavior of using Wasmtime as a CMake subproject has been improved.
+  [#13157](https://github.com/bytecodealliance/wasmtime/pull/13157)
+
+* Reference types in the C/C++ API have been refactored and reorganized.
+  [#13154](https://github.com/bytecodealliance/wasmtime/pull/13154)
+  [#13235](https://github.com/bytecodealliance/wasmtime/pull/13235)
+
+* The Wasmtime CLI now warns about usage of wasi-common or wasi-threads as these
+  components are slated for removal in Wasmtime 47.0.0. For more information see
+  [the associated RFC].
+  [#13264](https://github.com/bytecodealliance/wasmtime/pull/13264)
+
+[the associated RFC]: https://github.com/bytecodealliance/rfcs/pull/47
+
+* Inlining in Wasmtime now has a different set of configuration options, notably
+  more values are packed into `-Cinlining=...`.
+  [#13250](https://github.com/bytecodealliance/wasmtime/pull/13250)
+
+### Fixed
+
+* The WASIp1-to-WASIp2 adapter now handles nonblocking I/O in `fd_{read,write}`
+  more appropriately.
+  [#13111](https://github.com/bytecodealliance/wasmtime/pull/13111)
+
+* The `Host` header is injected less often for wasmtime-wasi-http.
+  [#13138](https://github.com/bytecodealliance/wasmtime/pull/13138)
+
+* Downcasts of `funcref` values now uses the correct type for imported
+  functions.
+  [#13161](https://github.com/bytecodealliance/wasmtime/pull/13161)
+
+* The DRC allocator's memory usage during tracing has been reduced when there
+  are large arrays.
+  [#13192](https://github.com/bytecodealliance/wasmtime/pull/13192)
+
+* The performance of reading stdin in WASI has been improved.
+  [#13256](https://github.com/bytecodealliance/wasmtime/pull/13256)
+
 --------------------------------------------------------------------------------
 
 Release notes for previous releases of Wasmtime can be found on the respective