|
|
|
|
|
|
by mswphd
38 days ago
|
|
|
Another example: For years rust was limited on performance optimizations in LLVM. Specifically, it was difficult to get LLVM to properly optimize for Rust's generated code, namely where one can make strong aliasing (and non-aliasing) statements using `noalias`. This is a (pre-existing iirc) LLVM attribute. Despite being a pre-existing feature motivated by C-like languages, typical C/C++ code does not leverage this attribute that much. So there were a surprising number of bugs in the handling of the attribute, and it took a number of years (I didn't follow things closely, but >= 3 for sure, maybe as much as 6?) before they got ironed out enough where it could be enabled. |
|
|