Auto merge of #138634 - saethlin:repeated-uninit, r=scottmcm,oli-obk

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Lower to a memset(undef) when Rvalue::Repeat repeats uninit

Fixes https://github.com/rust-lang/rust/issues/138625.

It is technically correct to just do nothing. But if we actually do nothing, we may miss that this is de-initializing something, so instead we just lower to a single memset that writes undef. This is still superior to the memcpy loop, in both quality of code we hand to the backend and LLVM's final output.

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bors 2025-03-25 02:09:15 +00:00

parent 9d9828c156 ca6677d261

commit 90806ec063

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