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f08c337615
Was reverted in 0507fc2ffc9, in phi-coalesce-subreg.mir I'd explicitly named some passes to run instead of specifying a range. As a result some two-address-instrs weren't correctly rewritten and the verifier got upset. Original commit message: [DebugInstrRef][2/3] Track PHI values through register coalescing In the instruction referencing variable location model, we store variable locations that point at PHIs in MachineFunction during register allocation. Unfortunately, register coalescing can substantially change the locations of registers, and so that PHI-variable-location side table needs maintenence during the pass. This patch builds an index from the side table, and whenever a vreg gets coalesced into another vreg, update the index to record the new vreg that the PHI happens in. It also accepts a limited range of subregister coalescing, for example merging a subregister into a larger class. Differential Revision: https://reviews.llvm.org/D86813 |
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