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(merge: 2e996ff e20ea0b)
auto merge of #19574 : erickt/rust/vec-reserve, r=alexcrichton
authorbors <bors@rust-lang.org>
Mon, 8 Dec 2014 18:42:21 +0000 (18:42 +0000)
committerbors <bors@rust-lang.org>
Mon, 8 Dec 2014 18:42:21 +0000 (18:42 +0000)
commit84a7615418749d663d54dd9223a15098b834e2a0
tree9c8fd2f5ca13dc3e56db196ecd26894b9961003dtree | snapshot
parent2e996ffb46d4f9e58d111d7e0de21602ac92411fcommit | diff
parente20ea0b67dbd5428bc3d355862692f1efecd378ccommit | diff
auto merge of #19574 : erickt/rust/vec-reserve, r=alexcrichton

(I don't understand why this works, and so I don't quite trust this yet. I'm pushing it up to see if anyone else can replicate this performance increase)

Somehow llvm is able to optimize this version of Vec::reserve into dramatically faster than the old version. In micro-benchmarks this was 2-10 times faster. It also reduce my Rust compile time from 41 minutes to 27 minutes.

Closes #19281.
src/libcollections/vec.rs diff1 | diff2 | blob | history
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