`core::num::f16b` Rust's 16bit Brain Float - #160859

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Jamesbarford wants to merge 17 commits into

rust-lang:mainfrom

Jamesbarford:feat/fb16-pt1

Commits on Aug 14, 2026

ABI for F16B, the BFloat lang item, the ADT-to-backend layout bridge, and backend handling. GCC and Cranelift explicitly unsupported
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72e89c3
Add `#[lang = "bfloat"]` and `pub f16b struct` (as a `u16` wrapper) along with traits agreed on in the RFC
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86f0b31
f16b API and LLVM codegen tests
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ce95daf
Add test for an AArch64 `bf16` intrinsics, fixed code to allow an `f16b` to be treated as a primitive scalar
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a8baf6e
Pr Feedback;
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b840b82
Pr Feedback
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0d10959
Skip GCC in tests & add `f16b` to minicore
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bcb05c3
weave in `target_has_reliable_f16b`
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84787b4
update condition for `cfg.has_reliable_f16b = ...`, along with comment updates
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3b3e8ae
documentation feedback
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1f9f414
version >= 21 for AArch64, x86_64 and RISC-V, along with improved documentation
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7938bd4
Add tests checking assembly
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c2162ec
more similar tests to the `f16` for feature gating
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6cec228
update documentation on struct
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669cd12
update error message on WASM
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ed74711
add loongarch64 & tests
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62a7f72

Commits on Aug 17, 2026

CI pipeline work; use a neon example and minicore for intrinsic test
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4ff6c4b