================
@@ -1487,6 +1487,14 @@ BitFieldType::getABIAlignment(const mlir::DataLayout
&dataLayout,
return 1;
}
+std::optional<uint64_t> BitFieldType::getDeclaredExtentInBits(
+ const mlir::DataLayout &dataLayout) const {
+ if (getFields().size() != 1)
+ return std::nullopt;
+ return dataLayout.getTypeSizeInBits(getFields().front().getDeclaredType())
----------------
adams381 wrote:
It returns nullopt for a multi-declaration unit, so `front()` only runs when
there's exactly one. A later declaration starts partway into the unit, so its
declared size doesn't describe what the unit covers from bit zero. I had
considered naming this `getSoleDeclaredExtentInBits`, and can go with that if
it makes it more clear.
https://github.com/llvm/llvm-project/pull/222108
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