Support AVX and aarch64 float4x2

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Getting set up

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1. Read the whole issue, then the project's contributing guide.
2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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  lieff/minimp3#147 · Opened May 23, 2026

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