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Rollup merge of #67888 - Zoxc:metadata-prefetch, r=matthewjasper
authorMazdak Farrokhzad <twingoow@gmail.com>
Sat, 21 Mar 2020 07:51:10 +0000 (08:51 +0100)
committerGitHub <noreply@github.com>
Sat, 21 Mar 2020 07:51:10 +0000 (08:51 +0100)
Prefetch some queries used by the metadata encoder

This brings the time for `metadata encoding and writing` for `syntex_syntax` from 1.338s to 0.997s with 6 threads in non-incremental debug mode.

r? @Mark-Simulacrum

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src/librustc/ty/context.rs patch | diff1 | diff2 | blob | history

diff --cc src/librustc/ty/context.rs
Simple merge
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