Implement a generic Destination Propagation optimization on MIR - #72632

Merged

bors merged 20 commits into

rust-lang:masterfrom

jonas-schievink:dest-prop

Sep 20, 2020

Commits on Sep 18, 2020

Implement a destination propagation pass
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78ff69b
simplify_try: print dest_prop diff and bless
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43ad8e4
simplify_try: clean up test
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1649895
Make nrvo-simple set mir-opt-level=1
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8a7b1c3
Bless mir-opt tests
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8a3e2b7
Fix dataflow assert errors
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812d4bb
Add a few dest-prop MIR tests
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7dbc7f7
perf: walk liveness backwards in Conflicts::build
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402f863
Fix dest-prop mir-opt tests
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665a98d
perf: only calculate conflicts for candidates
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ab26fb1
perf: bail out when there's >500 candidate locals
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ddd6930
Record intra-statement/terminator conflicts
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88538ad
More logging
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934634e
Properly inherit conflicts when merging locals
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484db5b
Fix rebase fallout
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5728834
Limit block count
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7af964f
Fix rebase fallout
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cd5d720
Move inner items outside
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682de94
Return `Place` by value
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ffd9445
Clarify FIXME
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2f9271b