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Copy 1-element arrays as scalars, not vectors

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For `[T; 1]` it's silly to copy as `<1 x T>` when we can just copy as `T`.
This commit is contained in:
Scott McMurray 2023-10-06 01:17:09 -07:00
parent 579be69de9
commit ae9cec5839
4 changed files with 80 additions and 1 deletions
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7
compiler/rustc_codegen_llvm/src/type_of.rs
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@ -397,7 +397,12 @@ impl<'tcx> LayoutLlvmExt<'tcx> for TyAndLayout<'tcx> {
// extracts all the individual values.
let ety = element.llvm_type(cx);
return Some(cx.type_vector(ety, *count));
if *count == 1 {
// Emitting `<1 x T>` would be silly; just use the scalar.
return Some(ety);
} else {
return Some(cx.type_vector(ety, *count));
}
}
// FIXME: The above only handled integer arrays; surely more things