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  • Evan Cheng's avatar
    Clean up sub-register implementation by moving subReg information back to · 7f02cfa5
    Evan Cheng authored
    MachineOperand auxInfo. Previous clunky implementation uses an external map
    to track sub-register uses. That works because register allocator uses
    a new virtual register for each spilled use. With interval splitting (coming
    soon), we may have multiple uses of the same register some of which are
    of using different sub-registers from others. It's too fragile to constantly
    update the information.
    
    llvm-svn: 44104
    7f02cfa5
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