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This function is used to constrain a register class to a sub-class that supports the given sub-register index. For example, getSubClassWithSubReg(GR32, sub_8bit) -> GR32_ABCD. The function will be used to compute register classes when emitting INSERT_SUBREG and EXTRACT_SUBREG nodes and for register class inflation of sub-register operations. The version provided by TableGen is usually adequate, but targets can override. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141142 91177308-0d34-0410-b5e6-96231b3b80d8 |
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