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  • Jakob Stoklund Olesen's avatar
    Handle register masks in LiveVariables. · 8e3bb315
    Jakob Stoklund Olesen authored
    A register mask operand kills any live physreg that isn't preserved.
    Unlike an implicit-def operand, the clobbered physregs are never live
    afterwards.
    
    This means LiveVariables has to track a much smaller number of live
    physregs, and it should spend much less time in addRegisterDead().
    
    llvm-svn: 148609
    8e3bb315
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