Fix neon ee oe arm64 store corruption #9
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Co-authored-by: czaplejewicz <[email protected]>
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Implement missing ARM64 NEON FFT leaf functions (
neon64_ee,neon64_oe,neon64_eo,neon64_oo) to correct N=32 FFT results.The previous ARM64 port mixed 2-lane and 4-lane NEON operations, leading to uninitialized upper vector lanes being stored as garbage. This PR implements these functions using a strict 2-lane pipeline, mirroring the ARM32 behavior and ensuring all stored data is valid.