rust/compiler/rustc_hir
bors 4573a4a879 Auto merge of #86383 - shamatar:slice_len_lowering, r=bjorn3
Add MIR pass to lower call to `core::slice::len` into `Len` operand

During some larger experiment with range analysis I've found that code like `let l = slice.len()` produces different MIR then one found in bound checks. This optimization pass replaces terminators that are calls to `core::slice::len` with just a MIR operand and Goto terminator.

It uses some heuristics to remove the outer borrow that is made to call `core::slice::len`, but I assume it can be eliminated, just didn't find how.

Would like to express my gratitude to `@oli-obk` who helped me a lot on Zullip
2021-06-21 22:24:13 +00:00
..
src Auto merge of #86383 - shamatar:slice_len_lowering, r=bjorn3 2021-06-21 22:24:13 +00:00
Cargo.toml bumped smallvec deps 2021-02-14 18:03:11 +03:00