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Implement aarch64 SQDMULH LLVM intrinsics#1657

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Implement aarch64 SQDMULH LLVM intrinsics#1657
CathalMullan wants to merge 1 commit into
rust-lang:mainfrom
CathalMullan:sqdmulh

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@CathalMullan
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@CathalMullan CathalMullan commented May 29, 2026

Resolves #1655

Issue mentioned this is needed for tauri.
It's also needed for serde_json (via zmij usage).

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bjorn3 commented May 29, 2026

Would you mind implementing a scalar emulation instead? Using inline asm slows down compilation due to needing to spawn an external assembler. For crypto intrinsics that is better than generating non-constant time code, but for regular math, compilation speed is more important.

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