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Use br
instead of a conditional when switching on a constant boolean
#120650
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@bors try @rust-timer queue |
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Use `br` instead of a conditional when switching on a constant boolean r? `@ghost`
☀️ Try build successful - checks-actions |
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☀️ Try build successful - checks-actions |
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Finished benchmarking commit (14c7e36): comparison URL. Overall result: ✅ improvements - no action neededBenchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf. @bors rollup=never Instruction countThis is a highly reliable metric that was used to determine the overall result at the top of this comment.
Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Binary sizeResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Bootstrap: 660.289s -> 662.794s (0.38%) |
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Lets try applying this to all discriminants, not only bools |
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Use `br` instead of a conditional when switching on a constant boolean r? `@ghost`
☀️ Try build successful - checks-actions |
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Finished benchmarking commit (e99adce): comparison URL. Overall result: ✅ improvements - no action neededBenchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf. @bors rollup=never Instruction countThis is a highly reliable metric that was used to determine the overall result at the top of this comment.
Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Binary sizeResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Bootstrap: 659.551s -> 660.659s (0.17%) |
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r? compiler |
r? compiler |
Looks promising but I don't know enough about this to gauge if this has any subtle, undesirable side effects. r? compiler |
Use `br` instead of a conditional when switching on a constant boolean r? `@ghost`
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💔 Test failed - checks-actions |
@bors r- pub fn main() {
match -1 { -1 => {}, _ => panic!("wat") }
assert_eq!(1-1, 0);
} This test fails on the first match, and codegens to a branch directly to the panic. Looking into it |
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Looks like |
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o7 |
🌲 The tree is currently closed for pull requests below priority 50. This pull request will be tested once the tree is reopened. |
☀️ Test successful - checks-actions |
Finished benchmarking commit (89d8e31): comparison URL. Overall result: ✅ improvements - no action needed@rustbot label: -perf-regression Instruction countThis is a highly reliable metric that was used to determine the overall result at the top of this comment.
Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Binary sizeResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Bootstrap: 650.564s -> 651.95s (0.21%) |
CopyProp: Propagate moves of constants Yet another try of rust-lang#120650 - this time, keep track of SSA locals with a constant value and propagate it. Then, re-run `SimplifyConstCondition` to take advantage of it (simply reordering the pass regressed some tests). r? `@ghost`
r? @ghost