Rust indexing w/o bound checks?

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I know this is a terrible terrible idea. Is there a way to disable bound checking on certain access to a Vec ?

Context: I'm benchmarking some sgemm code; I'm doing something stupid where transposing a matrix is taking more time than sgemm. I (without much evidence) suspect this might be due to bound checks, and want to see if there is a way to disable bound checks.

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