Patrick Walton 79bc53870f Introduce a fast path that avoids the debug_tuple abstraction when deriving ... Debug for unit-like enum variants. The intent here is to allow LLVM to remove the switch entirely in favor of an indexed load from a table of constant strings, which is likely what the programmer would write in C. Unfortunately, LLVM currently doesn't perform this optimization due to a bug, but there is [a patch](https://reviews.llvm.org/D109565) that fixes this issue. I've verified that, with that patch applied on top of this commit, Debug for unit-like tuple variants becomes a load, reducing the O(n) code bloat to O(1). Note that inlining `DebugTuple::finish()` wasn't enough to allow LLVM to optimize the code properly; I had to avoid the abstraction entirely. Not using the abstraction is likely better for compile time anyway. Part of #88793.		2021-09-10 12:07:03 -07:00
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src	Introduce a fast path that avoids the debug_tuple abstraction when deriving	2021-09-10 12:07:03 -07:00
Cargo.toml	rfc3052: Remove authors field from Cargo manifests	2021-07-29 14:56:05 -07:00