[llvm-dev] TargetOpcode::KILL confusion

[Johnson, Nicholas Paul via llvm-dev]

Hello,


Could someone please explain the semantics of TargetOpcode::KILL?  Specifically, in this example, which register is killed?  Would it be legal for operands 0 and 1 to refer to different registers?


128B    %R3<def> = KILL %R3, %R3_1<imp-use>, %R3_23<imp-use>


(In my out-of-tree target, %R3 is a <4xi32> register, %R3_1 is an i32 sub-register of %R3, and %R3_23 is a <2xi32> sub-register of %R3).


Thanks,

Nick


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