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[release-notes] .NET Runtime in .NET 11 Preview 6 #10458
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| # .NET Runtime in .NET 11 Preview 6 - Release Notes | ||
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| .NET 11 Preview 6 includes runtime performance work and continued WebAssembly bring-up: | ||
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| - [Runtime-async keeps getting faster](#runtime-async-keeps-getting-faster) | ||
| - [Browser and WebAssembly on CoreCLR](#browser-and-webassembly-on-coreclr) | ||
| - [Bug fixes](#bug-fixes) | ||
| - [Community contributors](#community-contributors) | ||
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| .NET Runtime updates in .NET 11: | ||
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| - [What's new in the .NET 11 runtime](https://learn.microsoft.com/dotnet/core/whats-new/dotnet-11/runtime) | ||
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| ## Runtime-async keeps getting faster | ||
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| Runtime-async — the runtime's built-in implementation of `async`/`await` — continues to get faster in Preview 6, building on the suspension improvements from Preview 5. The JIT now compiles a dedicated runtime-async version of a synchronous, task-returning method rather than delegating to it through a thunk ([dotnet/runtime #128384](https://github.com/dotnet/runtime/pull/128384)). The JIT turns the method's tail calls into runtime-async calls and awaits the task that would otherwise have been returned, so the async path no longer pays for an extra layer of indirection. | ||
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| Several related changes reduce suspension overhead further: | ||
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| - The JIT tail-merges async suspension points so the generated code is smaller ([dotnet/runtime #128559](https://github.com/dotnet/runtime/pull/128559)). | ||
| - Continuations used for runtime-async callable task thunks are cached and reused ([dotnet/runtime #128320](https://github.com/dotnet/runtime/pull/128320)). | ||
| - Methods that are already pooled opt out of runtime-async, avoiding redundant work ([dotnet/runtime #128943](https://github.com/dotnet/runtime/pull/128943)). | ||
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| These changes are automatic — no source or project changes are required to benefit from them. | ||
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| ## Browser and WebAssembly on CoreCLR | ||
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| Bring-up of the CoreCLR runtime for `browser-wasm` continues in Preview 6. The WebAssembly RyuJIT back end gained more code generation support — including contained bitcast operands, `callfinally` codegen, and packed SIMD encodings — and the garbage collector now zero-initializes shadow-stack slots and emits write barriers correctly on WebAssembly ([dotnet/runtime #128472](https://github.com/dotnet/runtime/pull/128472), [dotnet/runtime #128348](https://github.com/dotnet/runtime/pull/128348), [dotnet/runtime #128229](https://github.com/dotnet/runtime/pull/128229), [dotnet/runtime #128225](https://github.com/dotnet/runtime/pull/128225), [dotnet/runtime #129073](https://github.com/dotnet/runtime/pull/129073)). | ||
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| Browser CoreCLR remains opt-in this preview. As described in the Preview 5 notes, you can try it in a WebAssembly project that targets `net11.0` by setting `UseMonoRuntime` to `false`: | ||
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| ```xml | ||
| <PropertyGroup> | ||
| <TargetFramework>net11.0</TargetFramework> | ||
| <UseMonoRuntime>false</UseMonoRuntime> | ||
| </PropertyGroup> | ||
| ``` | ||
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| A dedicated native WebAssembly toolchain for browser CoreCLR isn't available yet, so AOT and native build paths still require the Mono runtime. | ||
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| <!-- Filtered features (significant engineering work, but too internal/incomplete for release notes): | ||
| - Arm64 PAC-RET (pointer authentication for return addresses, dotnet/runtime #128147, #129130): security hardening, but disabled by default and still being landed in pieces. Document when it's enabled and user-facing. | ||
| - NativeAOT aggregate executable shims (dotnet/runtime #128553): gated behind EnablePreviewFeatures, very narrow audience (NativeAOT shared libraries with multiple entry points). | ||
| - Numerous cDAC / DAC and diagnostics-plumbing changes: internal diagnostics infrastructure with no direct developer-facing surface this preview. | ||
| --> | ||
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| ## Bug fixes | ||
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| - **JIT / code generation** | ||
| - Fixed an x86 GC hole in stack-to-stack struct copies ([dotnet/runtime #128805](https://github.com/dotnet/runtime/pull/128805)). | ||
| - Stopped the JIT from killing floating-point, SIMD, and mask registers across x64 write barriers ([dotnet/runtime #128778](https://github.com/dotnet/runtime/pull/128778)). | ||
| - Improved code generation for `PopCount` and `TrailingZeroCount` on Arm64 ([dotnet/runtime #128677](https://github.com/dotnet/runtime/pull/128677)). | ||
| - **NativeAOT** | ||
| - Accepted full-width `0x`/`0X`-prefixed 64-bit hexadecimal environment configuration values ([dotnet/runtime #128462](https://github.com/dotnet/runtime/pull/128462)). | ||
| - Fixed string-related GC configuration handling ([dotnet/runtime #128455](https://github.com/dotnet/runtime/pull/128455)). | ||
| - **Mono / interpreter** | ||
| - Fixed stale GC liveness reporting for a variable before it is set ([dotnet/runtime #128709](https://github.com/dotnet/runtime/pull/128709)). | ||
| - **Runtime** | ||
| - Fixed `ValueType.GetHashCode` for a type with a nested generic field ([dotnet/runtime #129728](https://github.com/dotnet/runtime/pull/129728)). Thank you [@huoyaoyuan](https://github.com/huoyaoyuan)! | ||
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| ## Community contributors | ||
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| Thank you contributors! ❤️ | ||
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| - [@am11](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Aam11) | ||
| - [@BoyBaykiller](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3ABoyBaykiller) | ||
| - [@clamp03](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Aclamp03) | ||
| - [@cshung](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Acshung) | ||
| - [@elringus](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Aelringus) | ||
| - [@filipnavara](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Afilipnavara) | ||
| - [@gbalykov](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Agbalykov) | ||
| - [@jonathandavies-arm](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Ajonathandavies-arm) | ||
| - [@maximmenshikov](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Amaximmenshikov) | ||
| - [@MichalPetryka](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3AMichalPetryka) | ||
| - [@Ruihan-Yin](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3ARuihan-Yin) | ||
| - [@saucecontrol](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Asaucecontrol) | ||
| - [@sethjackson](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3Asethjackson) | ||
| - [@SwapnilGaikwad](https://github.com/dotnet/runtime/pulls?q=is%3Apr+is%3Amerged+author%3ASwapnilGaikwad) | ||
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It seems that many notable JIT optimization works are ignored: https://github.com/dotnet/runtime/pulls?q=is%3Apr+milestone%3A11.0-preview6+is%3Amerged+label%3Aarea-CodeGen-coreclr+