Nicholas Nethercote 80a44779f7 Lazily allocate TypedArena's first chunk. ... Currently `TypedArena` allocates its first chunk, which is usually 4096 bytes, as soon as it is created. If no allocations are ever made from the arena then this allocation (and the corresponding deallocation) is wasted effort. This commit changes `TypedArena` so it doesn't allocate the first chunk until the first allocation is made. This change speeds up rustc by a non-trivial amount because rustc uses `TypedArena` heavily: compilation speed (producing debug builds) on several of the rustc-benchmarks increases by 1.02--1.06x. The change should never cause a slow-down because the hot `alloc` function is unchanged. It does increase the size of `TypedArena` by one `usize` field, however. The commit also fixes some out-of-date comments.		2016-09-20 22:00:29 +10:00
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Cargo.toml	bootstrap: Add a bunch of Cargo.toml files	2016-02-11 11:12:32 -08:00
lib.rs	Lazily allocate TypedArena's first chunk.	2016-09-20 22:00:29 +10:00