================
@@ -79,6 +79,24 @@ struct CIRRecordLowering final {
cir::ArrayType::get(cirGenTypes.convertTypeForMem(field->getType()),
0),
cir::RecordMemberKind::BitField);
}
+
+ /// A member recording that declared types reach \p excessInBits past where
+ /// it sits. An access unit's width is the compiler's choice, so it can be
+ /// narrower than the types declared in it, and the ABI reads that reach to
----------------
adams381 wrote:
I've been using "reach" and "extent" interchangeably here. Perhaps that has
been causing the confusion. Neither is from the ABI spec. The whole idea
boils down to the compiler chosen storage for the bitfield can be smaller than
the declared size, so how far does the declared size extend/reach beyond the
compiler chosen size?
I've renamed with "extent" throughout: `makeDeclaredExtentInfo`,
`declaredExtentBits`, `extentOutrunsMembers`, `addDeclaredExtent`, the prose in
both files, and the two test files, which are now `-bitfield-extent`.
https://github.com/llvm/llvm-project/pull/220069
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