Introduce a SwitchInt construct to MIR
#29588
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integers and characters into one master switch.
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r? @Aatch (rust_highfive has picked a reviewer for you, use r? to override) |
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Looks good to me. Matches the design for LLVM's switch pretty well, so should be easy to translate when we get there. |
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⌛ Testing commit 3e6b454 with merge 81f13bc... |
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💔 Test failed - auto-mac-64-nopt-t |
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@bors r=aatch |
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📌 Commit dcf323e has been approved by |
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Nov 6, 2015
Introduce a `SwitchInt` and restructure pattern matching to collect integers and characters into one master switch. This is aimed at #29227, but is not a complete fix. Whereas before we generated an if-else-if chain and, at least on my machine, just failed to compile, we now spend ~9sec compiling `rustc_abuse`. AFAICT this is basically just due to a need for more micro-optimization of the matching process: perf shows a fair amount of time just spent iterating over the candidate list. Still, it seemed worth opening a PR with this step alone, since it's a big step forward.
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Introduce a
SwitchIntand restructure pattern matching to collect integers and characters into one master switch. This is aimed at #29227, but is not a complete fix. Whereas before we generated an if-else-if chain and, at least on my machine, just failed to compile, we now spend ~9sec compilingrustc_abuse. AFAICT this is basically just due to a need for more micro-optimization of the matching process: perf shows a fair amount of time just spent iterating over the candidate list. Still, it seemed worth opening a PR with this step alone, since it's a big step forward.