Do not convert copies of packed projections to moves.#115138
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bors merged 2 commits intorust-lang:masterfrom Aug 25, 2023
Merged
Do not convert copies of packed projections to moves.#115138bors merged 2 commits intorust-lang:masterfrom
bors merged 2 commits intorust-lang:masterfrom
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r? @b-naber (rustbot has picked a reviewer for you, use r? to override) |
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Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt |
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Aug 23, 2023
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@bors r+ |
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☀️ Test successful - checks-actions |
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Finished benchmarking commit (25ed43d): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. Max RSS (memory usage)This benchmark run did not return any relevant results for this metric. CyclesThis benchmark run did not return any relevant results for this metric. Binary sizeThis benchmark run did not return any relevant results for this metric. Bootstrap: 630.96s -> 633.115s (0.34%) |
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This code path was introduced in #113758
After seeing https://rust-lang.zulipchat.com/#narrow/stream/136281-t-opsem/topic/Packed.20fields.20and.20in-place.20function.20argument.2Freturn.20passing, this may be UB, so should be disallowed.
This should not appear in normally-built MIR, which introduces temporary copies for packed projections.