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AMDGPU target tries to handle the SGPR and VGPR spills in a custom pass before the actual frame lowering pass. Once they are handled and the respective frames are eliminated in the custom pass, certain uses of them still remain. For instance, the DBG_VALUE instructions inserted by the allocator alongside the spill instruction will use the corresponding frame index. They become dead later during PEI and causes a crash while trying to replace the frame indices. We should possibly avoid this custom pass. For now, replacing such dead references with null register value. Reviewed By: arsenm, scott.linder Differential Revision: https://reviews.llvm.org/D98038 |
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