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sha2: fix round count comment in LoongArch64 SHA-512 backend - #932
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sha2/src/sha512/loongarch64_asm.rs says "Do 64 rounds of hashing" in front of the unrolled round sequence, but the sequence is rounda!(0..16) plus roundb!(16..79) — 80 rounds, as SHA-512 requires.
64 is the SHA-256 round count; the comment was copied from sha256/loongarch64_asm.rs:106, where it is correct.
Comment-only change, no behavior change. This backend is gated behind cfg(target_arch = "loongarch64"), so it is not compiled on other targets; cargo test -p sha2 passes.