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+title = "Fearless SIMD v1.0 is here"
+authors = ["Shnatsel"]
++++
+
+[`fearless_simd`](https://crates.io/crates/fearless_simd) takes `unsafe` out of SIMD.
+
+It has come a long way since the [original prototype 8 years ago](https://raphlinus.github.io/rust/simd/2018/10/19/fearless-simd.html). We are now confident that whatever it is you need, be it just autovectorization and multiversioning, or full-blown portable SIMD abstractions, or safe access to intrinsics and nothing more, Fearless SIMD will serve you well.
+
+Instead of paraphrasing the [changelog](https://github.com/linebender/fearless_simd/blob/main/CHANGELOG.md), I'd like to take this opportunity to reflect on the goals of Fearless SIMD, how it achieves them, and what sets it apart from other SIMD abstractions.
+
+# Performance
+
+A common criticism leveled at portable SIMD abstractions is that they aren't performant enough, so we've put a lot of effort into making sure that Fearless SIMD never holds you back.
+
+For example, when implementing portable abstractions for operations with different behavior in edge cases on different platforms, such as [swizzles](https://docs.rs/fearless_simd/latest/fearless_simd/trait.SimdBase.html#tymethod.swizzle_dyn) or [floating-point maximum](https://docs.rs/fearless_simd/latest/fearless_simd/trait.SimdBase.html#tymethod.max), we provide both a precise variant that's the same on all platforms, and a fast variant that returns a platform-dependent result, for use when you expect the edge cases to never happen.
+
+We also made it easy to [express SIMD algorithms in terms of the hardware's native vector size](https://github.com/linebender/fearless_simd/blob/main/fearless_simd/examples/sigmoid.rs), so that your code always takes full advantage of the hardware, no matter where it runs. Fixed vector sizes are also supported for algorithms that need them.
+
+We also put a lot of effort into making sure the implementations of our portable SIMD operations are state-of-the-art, and even contributed improvements upstream - both to [Rust](https://shnatsel.github.io/improving-std-simd-swizzle-dyn/) and [LLVM](https://gist.github.com/valadaptive/e37cc66c721b987935ef4d74cab6f3d6).
+
+But if you need an instruction that isn't covered by portable abstractions, or want even more control, you can [safely drop down to platform intrinsics](https://github.com/linebender/fearless_simd/blob/main/fearless_simd/examples/srgb.rs) with no overhead for the parts of your code that need it, and keep the rest simple and portable.
+
+With safe access to intrinsics, there *is* no performance ceiling.
+
+# Safety
+
+If you look up the source code of any other SIMD abstraction, you will find that it is full of `unsafe` code. Something like `rg unsafe` will turn up several *thousands* of `unsafe` blocks. 
+
+But not in Fearless SIMD! The crate is engineered not to require ad-hoc `unsafe` code.
+
+One piece of the puzzle is the [kernel! macro](https://docs.rs/fearless_simd/latest/fearless_simd/macro.kernel.html), which leans on [target feature v1.1](https://rust-lang.github.io/rfcs/2396-target-feature-1.1.html) in the compiler to invoke most SIMD intrinsics without `unsafe`. I have described the design in detail [in an earlier blog post](https://shnatsel.github.io/safe-simd-in-rust-even-on-the-inside/), so check this out if you'd like to learn more.
+
+That removes most of ad-hoc `unsafe`, but doesn't cover SIMD load/store operations which operate on raw pointers. That's where our [safe transmute module](https://github.com/linebender/fearless_simd/blob/850adcae4996e6584fa77443a652c666f2aab126/fearless_simd/src/transmute.rs), inspired by crates such as `bytemuck` and `zerocopy`, comes into play.
+
+SIMD intrinsics like `_mm_loadu_epi32` may seem special, but actually turn into plain loads and stores behind the scenes. So you can fully replicate their functionality with a [single, reusable wrapper](https://github.com/linebender/fearless_simd/blob/850adcae4996e6584fa77443a652c666f2aab126/fearless_simd/src/transmute.rs#L252-L354).
+
+Thanks to the power of Rust's type system, we only need to audit these two small, self-contained building blocks. As long as they are memory-safe, the entire rest of the codebase is guaranteed to be memory-safe as well.
+
+At last, SIMD in Rust can be truly fearless.
+
+We are so confident in this design that we will be providing [3 years of security updates](https://github.com/linebender/fearless_simd/blob/main/fearless_simd/SECURITY.md) for v1.0 and all later versions.
+
+# Ergonomics
+
+Function multiversioning is tricky.
+
+Previous solutions either [require adding `#[inline(always)]` annotations](https://shnatsel.github.io/safe-simd-in-rust-even-on-the-inside/) and understanding their implications, or [impose a small overhead on every function call](https://docs.rs/multiversion/0.9.0/multiversion/). The latter is fine most of the time, but degrades performance on very small functions, and still requires you to surgically add `#[inline(always)]` to get around that.
+
+Both are leaky abstractions - you still need to think of what is happening under the hood.
+
+Alongside `fearless_simd` v1.0, we are launching `fearless_simd_macros` v0.1, which provides a non-leaky abstraction: the `#[simd]` macro. With it, you don't have to think about what's happening under the hood at all! Put it on any SIMD function and it Just Works.
+
+
+That said, while this is a big step forward for the ecosystem, there is still some boilerplate involved. We are keen to reduce it further, either with compiler support via the [Struct Target Features RFC](https://github.com/rust-lang/rfcs/pull/3525) to get rid of the `#[simd]` annotation entirely, or perhaps through [other tricks](https://github.com/linebender/fearless_simd/pull/375) we will explore in the future.
+
+And if you don't like procedural macros, the old way of doing things is still available, if less convenient.
+
+Ergonomics are the one area we expect may still evolve. But this does not compromise the stability guarantees of the core `fearless_simd` crate, and the code written today will continue working indefinitely.
+
+# Evolution
+
+The current API should be easy to evolve without breaking changes.
+
+While we cannot see the future, there are viable paths to supporting both near-term Rust features, such as the `f16` type, and longer-term features such as [SVE](https://en.wikipedia.org/wiki/AArch64#Scalable_Vector_Extension_(SVE)) and [RISC-V Vector Extension](https://rvv-isadoc.readthedocs.io/en/latest/index.html) if/when these hardware extensions become relevant.
+
+## Relation to std::simd
+
+We would love to see `std::simd` stabilized, but it would not make Fearless SIMD obsolete.
+
+The Rust standard library implements only the parts that absolutely have to be in it, and the rest (multiversioning, hardware-width vectors, etc) is left up to the ecosystem crates.
+
+`fearless_simd` includes an equivalent of `std::simd` that works on stable Rust, but that is just one part of the bigger whole.
+
+Once `std::simd` is stabilized, we will port Fearless SIMD to it to delete a lot of custom code and gain support all sorts of obscure platforms. But the need for ecosystem crates such as `fearless_simd` will remain.
+
+# Adoption
+
+It doesn't matter how brilliant your crate is if nobody is using it.
+
+Fearless SIMD is already used by [30 other crates](https://crates.io/crates/fearless_simd/reverse_dependencies) as a direct dependency, and is undirectly relied on by [over a thousand crates](https://lib.rs/crates/fearless_simd/rev)!
+
+It already underpins a nontrivial fraction of the Rust ecosystem, and we hope that v1.0 will take this even further.
+
+If you'd like to use Fearless SIMD in your project, check out the [documentation](https://docs.rs/fearless_simd/latest/fearless_simd/) and [examples](https://github.com/linebender/fearless_simd/tree/main/fearless_simd/examples), and feel free to ask questions [on Zulip](https://xi.zulipchat.com/#narrow/channel/514230-simd)!