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| author | bors <bors@rust-lang.org> | 2023-02-26 21:41:17 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2023-02-26 21:41:17 +0000 |
| commit | 58136ffa92c81ec9e6ac1f91773254914da2ca01 (patch) | |
| tree | cfcd31d6accd32903b81745d10b986231880824e /compiler/rustc_mir_transform/src/coverage | |
| parent | d962ea57899d64dc8a57040142c6b498a57c8064 (diff) | |
| parent | 7de205ea3affa62d0f847380ab7313d465c4b2e4 (diff) | |
| download | rust-58136ffa92c81ec9e6ac1f91773254914da2ca01.tar.gz rust-58136ffa92c81ec9e6ac1f91773254914da2ca01.zip | |
Auto merge of #108440 - Zoxc:encoder-enum, r=cjgillot
Emit the enum discriminant separately for the Encodable macro This changes the `Encodable` proc macro to first emit the discriminant with a separate `match` statement, then emit the fields. LLVM can optimize down the first `match` to just a read of the enum discriminant. This avoids generating a `emit_usize` call per variant and enums with no fields now optimize down to just a single `emit_usize` call. The no variant case is special cased to avoid warnings about unreachable code. <table><tr><td rowspan="2">Benchmark</td><td colspan="1"><b>Before</b></th><td colspan="2"><b>After</b></th></tr><tr><td align="right">Time</td><td align="right">Time</td><td align="right">%</th></tr><tr><td>🟣 <b>clap</b>:check:unchanged</td><td align="right">0.4676s</td><td align="right">0.4640s</td><td align="right"> -0.78%</td></tr><tr><td>🟣 <b>hyper</b>:check:unchanged</td><td align="right">0.1348s</td><td align="right">0.1338s</td><td align="right"> -0.75%</td></tr><tr><td>🟣 <b>regex</b>:check:unchanged</td><td align="right">0.3370s</td><td align="right">0.3352s</td><td align="right"> -0.54%</td></tr><tr><td>🟣 <b>syn</b>:check:unchanged</td><td align="right">0.6326s</td><td align="right">0.6281s</td><td align="right"> -0.71%</td></tr><tr><td>🟣 <b>syntex_syntax</b>:check:unchanged</td><td align="right">1.8561s</td><td align="right">1.8589s</td><td align="right"> 0.15%</td></tr><tr><td>Total</td><td align="right">3.4282s</td><td align="right">3.4200s</td><td align="right"> -0.24%</td></tr><tr><td>Summary</td><td align="right">1.0000s</td><td align="right">0.9947s</td><td align="right"> -0.53%</td></tr></table>
Diffstat (limited to 'compiler/rustc_mir_transform/src/coverage')
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