56504a00f2
Split a func into cold/hot parts, reducing binary size I noticed that the Size::bits function is called in many places, and is inlined into them. On x86_64-pc-windows-msvc, this function is inlined 527 times, and compiled separately (non-inlined) 3 times. Each of those inlined calls contains code that panics. This commit moves the `panic!` call into a separate function and marks that function with `#[cold]`. This reduces binary size by 24 KB. Not much, but it's something. Changes like this often reduce pressure on instruction-caches, since it reduces the amount of code that is inlined into hot code paths. Or more precisely, it removes cold code from hot cache lines. |
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| Cargo.toml | ||
| README.md | ||
librustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.