x64: Ensure that constants are always 16 bytes for XmmMem#4790
x64: Ensure that constants are always 16 bytes for XmmMem#4790elliottt merged 6 commits intobytecodealliance:mainfrom
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| @@ -0,0 +1,17 @@ | |||
| test run | |||
| set enable_llvm_abi_extensions | |||
| target x86_64 | |||
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Should we just run this on all architectures as well as the interpreter? The bug was x64-specific but the test should work everywhere and it would be nice to know if it didn't.
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As a further suggestion, we can also remove the set enable_llvm_abi_extensions since we no longer have i128's in this new minimized test case.
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| #[inline] | ||
| fn emit_u128_le_const(&mut self, value: u128) -> VCodeConstant { | ||
| let data = VCodeConstantData::Generated(value.to_le_bytes().iter().cloned().collect()); | ||
| let data = VCodeConstantData::Generated(value.to_le_bytes().iter().copied().collect()); |
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Oh, after Chris' suggestion, now you can simplify this to value.to_le_bytes().into(), I think.
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I guess ConstantData doesn't have a From implementation for arrays, but .as_slice().into() ought to work at least.
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Looks like we're stuck with my verbose monstrosity:
809 | let data = VCodeConstantData::Generated(value.to_le_bytes().iter().into());
| ^^^^ the trait `From<core::slice::Iter<'_, u8>>` is not implemented for `ConstantData`
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The problem there is the .iter().
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Yeah, I get a similar error without it. I had been experimenting :)
809 | let data = VCodeConstantData::Generated(value.to_le_bytes().into());
| ^^^^ the trait `From<[u8; 16]>` is not implemented for `ConstantData`
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I'd figured out that just .into() wouldn't work after I posted my first comment. Did you try my second suggestion, of .as_slice().into()?
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Ah! Totally missed your second comment, that works 👍
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Hooray! It'd probably be nice if ConstantData actually had a From<[T; n]> implementation too, but I didn't want to suggest doing that in this PR. 😅
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Ensure that constants generated for the memory case of XmmMem values are always 16 bytes, ensuring that we don't accidantally perform an unaligned load.
Fixes #4761