Fix a couple ICEs in the new CastKind::Transmute code
#110021
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Oh, convenient, this accidentally made a repro of #109992 too 🙃 |
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CastKind::Transmute sizes in a better wayCastKind::Transmute code
WaffleLapkin
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Apr 7, 2023
| Some(OperandRef::new_zst(bx, cast).val) | ||
| } | ||
| (ScalarOrZst::Scalar(in_scalar), ScalarOrZst::Scalar(out_scalar)) | ||
| if in_scalar.size(self.cx) == out_scalar.size(self.cx) => |
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Why is this check necessary?
For pairs you need to check the inner size because matching size of the whole pair doesn't necessarily imply matching sizes of elements... But surely the operand.layout.size != cast.size check is sufficient for scalars? 🤔
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Oh, good call. Let me give that a shot -- might allow deleting more code too...
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Removed this check, but ScalarOrZst::size is still needed elsewhere, so I couldn't remove more than that.
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Oh, no, vectors. Without this check <4 x i64> to <8 x f32> trips the later debug-assert.
I suppose I could hypothetically bitcast that anyway, but I'm not doing that this PR.
Added some codegen tests for vectors so that when future me breaks this while running --keep-stage-std again, I'll notice without CI 😬
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I'd forgotten I made that test file only-64bit instead of my usual only-x86_64 🤦 @bors r=compiler-errors |
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Rollup of 6 pull requests Successful merges: - rust-lang#109724 (prioritize param env candidates if they don't guide type inference) - rust-lang#110021 (Fix a couple ICEs in the new `CastKind::Transmute` code) - rust-lang#110044 (Avoid some manual slice length calculation) - rust-lang#110115 (compiletest: Use remap-path-prefix only in CI) - rust-lang#110121 (Fix `x check --stage 1` when download-rustc is enabled) - rust-lang#110124 (Some clippy fixes in the compiler) Failed merges: - rust-lang#109752 (Stall auto trait assembly in new solver for int/float vars) r? `@ghost` `@rustbot` modify labels: rollup
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…ompiler-errors Add a distinct `OperandValue::ZeroSized` variant for ZSTs These tend to have special handling in a bunch of places anyway, so the variant helps remember that. And I think it's easier to grok than `Aggregate`s sometimes being `Immediates` (after all, I previously got that wrong and caused rust-lang#109992). As a minor bonus, it means we don't need to generate poison LLVM values for ZSTs to pass around in `OperandValue::Immediate`s. Inspired by rust-lang#110021 (comment), so r? `@compiler-errors`
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…ompiler-errors Add a distinct `OperandValue::ZeroSized` variant for ZSTs These tend to have special handling in a bunch of places anyway, so the variant helps remember that. And I think it's easier to grok than `Aggregate`s sometimes being `Immediates` (after all, I previously got that wrong and caused rust-lang#109992). As a minor bonus, it means we don't need to generate poison LLVM values for ZSTs to pass around in `OperandValue::Immediate`s. Inspired by rust-lang#110021 (comment), so r? ``@compiler-errors``
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…ompiler-errors Add a distinct `OperandValue::ZeroSized` variant for ZSTs These tend to have special handling in a bunch of places anyway, so the variant helps remember that. And I think it's easier to grok than `Aggregate`s sometimes being `Immediates` (after all, I previously got that wrong and caused rust-lang#109992). As a minor bonus, it means we don't need to generate poison LLVM values for ZSTs to pass around in `OperandValue::Immediate`s. Inspired by rust-lang#110021 (comment), so r? ```@compiler-errors```
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…ompiler-errors Add a distinct `OperandValue::ZeroSized` variant for ZSTs These tend to have special handling in a bunch of places anyway, so the variant helps remember that. And I think it's easier to grok than `Aggregate`s sometimes being `Immediates` (after all, I previously got that wrong and caused rust-lang#109992). As a minor bonus, it means we don't need to generate poison LLVM values for ZSTs to pass around in `OperandValue::Immediate`s. Inspired by rust-lang#110021 (comment), so r? `@compiler-errors`
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Check the sizes of the immediates, rather than the overall types, when deciding whether we can convert types without going through memory.
Fixes #110005
Fixes #109992
Fixes #110032
cc @matthiaskrgr