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Mark scalar layout unions so that backends that do not support partially initialized scalars can special case them.

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This commit is contained in:
Oli Scherer 2022-03-03 12:02:12 +00:00
parent 2ed6786404
commit d32ce37a17
37 changed files with 356 additions and 288 deletions
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7
compiler/rustc_const_eval/src/interpret/terminator.rs
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@ -189,12 +189,15 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
// that will take care to make it UB to leave the range, just
// like for transmute).
(abi::Abi::Scalar(caller), abi::Abi::Scalar(callee)) => {
caller.value == callee.value
caller.primitive() == callee.primitive()
}
(
abi::Abi::ScalarPair(caller1, caller2),
abi::Abi::ScalarPair(callee1, callee2),
) => caller1.value == callee1.value && caller2.value == callee2.value,
) => {
caller1.primitive() == callee1.primitive()
&& caller2.primitive() == callee2.primitive()
}
// Be conservative
_ => false,
}