Don't print block exit state in dataflow graphviz if unchanged #69158
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Dylan-DPC-zz
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Feb 15, 2020
…thewjasper Don't print block exit state in dataflow graphviz if unchanged A small quality-of-life improvement I was using while working on rust-lang#68528. It's pretty common to have a lot of zero-statement basic blocks, especially before a `SimplifyCfg` pass is run. When the dataflow state was dense, these blocks could take up a lot of vertical space since the full flow state was printed on both entry and exit. After this PR, we only print a block's exit state if it differs from that block's entry state. Take a look at the two basic blocks on the left. Before:  After: 
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JohnTitor
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…thewjasper Don't print block exit state in dataflow graphviz if unchanged A small quality-of-life improvement I was using while working on rust-lang#68528. It's pretty common to have a lot of zero-statement basic blocks, especially before a `SimplifyCfg` pass is run. When the dataflow state was dense, these blocks could take up a lot of vertical space since the full flow state was printed on both entry and exit. After this PR, we only print a block's exit state if it differs from that block's entry state. Take a look at the two basic blocks on the left. Before:  After: 
bors
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Rollup of 6 pull requests Successful merges: - #68495 (Updating str.chars docs to mention crates.io.) - #68701 (Improve #Safety of various methods in core::ptr) - #69158 (Don't print block exit state in dataflow graphviz if unchanged) - #69179 (Rename `FunctionRetTy` to `FnRetTy`) - #69186 ([tiny] parser: `macro_rules` is a weak keyword) - #69188 (Clean up E0309 explanation) Failed merges: r? @ghost
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A small quality-of-life improvement I was using while working on #68528. It's pretty common to have a lot of zero-statement basic blocks, especially before a
SimplifyCfgpass is run. When the dataflow state was dense, these blocks could take up a lot of vertical space since the full flow state was printed on both entry and exit. After this PR, we only print a block's exit state if it differs from that block's entry state. Take a look at the two basic blocks on the left.Before:
After:
