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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(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148609 91177308-0d34-0410-b5e6-96231b3b80d8
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