Avoid a bitcast FFI call in transmuting #142768
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For things that only change the valid ranges, we can just skip the `LLVMBuildBitCast` call. I tried to tweak this a bit more and broke stuff, so I also added some extra tests for that as we apparently didn't have coverage.
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rustbot has assigned @WaffleLapkin. Use |
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@bors r+ rollup |
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did not mean to clone PR... |
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…=WaffleLapkin Avoid a bitcast FFI call in transmuting For things that only change the valid ranges, we can just return the input, rather than making the `LLVMBuildBitCast` call and having *it* then do nothing. I tried to tweak this a bit more and broke stuff, so I also added some extra tests for that as we apparently didn't have coverage.
This was referenced Jun 25, 2025
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Rollup of 15 pull requests Successful merges: - #135731 (Implement parsing of pinned borrows) - #138780 (Add `#[loop_match]` for improved DFA codegen) - #142453 (Windows: make `read_dir` stop iterating after the first error is encountered) - #142633 (Error on invalid signatures for interrupt ABIs) - #142768 (Avoid a bitcast FFI call in transmuting) - #142825 (Port `#[track_caller]` to the new attribute system) - #142844 (Enable short-ice for Windows) - #142934 (Tweak `-Zmacro-stats` measurement.) - #142955 (Couple of test suite fixes for cg_clif) - #142977 (rustdoc: Don't mark `#[target_feature]` functions as ⚠) - #142980 (Reduce mismatched-lifetime-syntaxes suggestions to MaybeIncorrect) - #142982 (Corrected spelling mistake in c_str.rs) - #142983 (Taint body on invalid call ABI) - #142988 (Update wasm-component-ld to 0.5.14) - #142993 (Update cargo) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of #142768 - scottmcm:avoid-unneeded-bitcast, r=WaffleLapkin Avoid a bitcast FFI call in transmuting For things that only change the valid ranges, we can just return the input, rather than making the `LLVMBuildBitCast` call and having *it* then do nothing. I tried to tweak this a bit more and broke stuff, so I also added some extra tests for that as we apparently didn't have coverage.
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Huh, I wasn't expecting anything material from this, but something in #142997 was, so out of curiosity |
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Queued 4e95f4a with parent 2c2bb99, future comparison URL. |
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For things that only change the valid ranges, we can just return the input, rather than making the
LLVMBuildBitCastcall and having it then do nothing.I tried to tweak this a bit more and broke stuff, so I also added some extra tests for that as we apparently didn't have coverage.