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LLM disclosure: LLMs were used to generate the boilerplate for the MIR tests, but each test was manually reviewed and adjusted before committing. LLMs were also used to audit this pass against the rest of the compiler MIR transforms and Miri semantics. |
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Depends on #163336 and #163337
This PR implements the
MoveEliminationpass from rust-lang/rfcs#3943.This pass uses the analysis results from
PreciseLivenessto unify locals that are related by an assignment. This also includes an alias-fixup pass which is needed because some rvalues don't allow sources to overlap with the destination place.The pass is only enabled under
-Zmir-move-elimination. This flag also disablesDestinationPropagation, which is superseded by the new pass.r? tmiasko