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Mirror of https://github.com/RPCS3/llvm-mirror
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This is part 2 of a 3-part series to address a compile-time explosion issue in LiveDebugValues. --- Each VarLoc has a unique ID: this ID is used to look up a VarLoc in the VarLocMap, and to virtually insert a VarLoc into a VarLocSet. Instead of inserting the VarLoc /itself/ into the VarLocSet, we insert just the ID, because this can be represented efficiently with a SparseBitVector. This change introduces LocIndex, a layer of abstraction on top of VarLoc IDs. Prior to this change, an ID was just an index into a vector. With this change, an ID encodes both an index /and/ a register location. The type-checker ensures that conversions to and from LocIndex are correct. For the moment the register location is always 0 (undef). We have plenty of bits left over to encode physregs, stack slots, and other locations in the future. Differential Revision: https://reviews.llvm.org/D74985 |
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