bjoernager/rust
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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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6
compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/mod.rs
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@ -118,7 +118,7 @@ fn tag_base_type<'ll, 'tcx>(
Variants::Multiple { tag_encoding: TagEncoding::Niche { .. }, tag, .. } => {
// Niche tags are always normalized to unsized integers of the correct size.
match tag.value {
match tag.primitive() {
Primitive::Int(t, _) => t,
Primitive::F32 => Integer::I32,
Primitive::F64 => Integer::I64,
@ -136,7 +136,7 @@ fn tag_base_type<'ll, 'tcx>(
Variants::Multiple { tag_encoding: TagEncoding::Direct, tag, .. } => {
// Direct tags preserve the sign.
tag.value.to_ty(cx.tcx)
tag.primitive().to_ty(cx.tcx)
}
}
}
@ -425,7 +425,7 @@ fn compute_discriminant_value<'ll, 'tcx>(
let value = (variant_index.as_u32() as u128)
.wrapping_sub(niche_variants.start().as_u32() as u128)
.wrapping_add(niche_start);
let value = tag.value.size(cx).truncate(value);
let value = tag.size(cx).truncate(value);
// NOTE(eddyb) do *NOT* remove this assert, until
// we pass the full 128-bit value to LLVM, otherwise
// truncation will be silent and remain undetected.