9ed0bf9f2b
Rearrange slice::split_mut to remove bounds check Closes https://github.com/rust-lang/rust/issues/86313 Turns out that all we need to do here is reorder the bounds checks to convince LLVM that all the bounds checks can be removed. It seems like LLVM just fails to propagate the original length information past the first bounds check and into the second one. With this implementation it doesn't need to, each check can be proven inbounds based on the one immediately previous. I've gradually convinced myself that this implementation is unambiguously better based on the above logic, but maybe this is still deserving of a codegen test? Also the mentioned borrowck limitation no longer seems to exist. |
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