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You're writing the first stage of a bootloader for a chip your company makes, and your SDK will provide the users with this code. EG this file from ST's CubeMX picked out of the first project containing it I found on GitHub.
You're manually vectorizing something and using SIMD intrinsics instead of straight assembly. EG Blake3's AVX2 vectorization using intrinsics in Rust.
Very, very occasionally, it's actually possible to optimize something better than the compiler does. EG libsodium's elliptic curve scalar multiplication routines for Sandy Bridge.