[PATCH] D70501: [SystemZ] Don't build a PPA instruction with an immediate 0

[Ulrich Weigand via Phabricator via llvm-commits]

uweigand added a comment.

In D70501#1758612 <https://reviews.llvm.org/D70501#1758612>, @jonpa wrote:

> This builds a register operand with NoReg, which then makes the IR correct while it is also necessary to handle this in the AsmPrinter since otherwise the call to get the register name will fail.


Can't we handle NoRegister generically in the AsmPrinter somewhere without tying that to the specific PPA opcode?  Maybe we'll want to use it elsewhere as well ...


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