Fix transmute::<T, U> where T requires a bigger alignment than U #33233
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For types that are not bitcast-compatible, transmute tries to avoid generating a temporary by translating its source expression directly into its destination, but when the source type has a bigger alignment requirement than the destination, this can lead to code that breaks due to misaligned stores. So in that case we need to generate a temporary for the source expression and then copy that into the destination, setting the proper alignment information on the memcpy/store. Fixes rust-lang#32947
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r? @jroesch (rust_highfive has picked a reviewer for you, use r? to override) |
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@bors r+ |
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📌 Commit ab0de54 has been approved by |
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Apr 27, 2016
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Ah, right, the MIR implementation of |
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⌛ Testing commit ab0de54 with merge 619f57e... |
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⛄ The build was interrupted to prioritize another pull request. |
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@bors r- |
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ping @dotdash, any update on this? |
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☔ The latest upstream changes (presumably #35764) made this pull request unmergeable. Please resolve the merge conflicts. |
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Closing due to inactivity, but feel free to resubmit with a rebase! |
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For types that are not bitcast-compatible, transmute tries to avoid
generating a temporary by translating its source expression directly
into its destination, but when the source type has a bigger alignment
requirement than the destination, this can lead to code that breaks due
to misaligned stores. So in that case we need to generate a temporary
for the source expression and then copy that into the destination,
setting the proper alignment information on the memcpy/store.
Fixes #32947