[all-commits] [llvm/llvm-project] ebef92: [SystemZ] Remove most hard-coded R1D instances for...

[Ulrich Weigand via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ebef92169ca5a50fb8aeec08f35ccb919311acc1
      https://github.com/llvm/llvm-project/commit/ebef92169ca5a50fb8aeec08f35ccb919311acc1
  Author: Ulrich Weigand <ulrich.weigand at de.ibm.com>
  Date:   2020-12-15 (Tue, 15 Dec 2020)

  Changed paths:
    M llvm/lib/Target/SystemZ/SystemZAsmPrinter.cpp
    M llvm/lib/Target/SystemZ/SystemZElimCompare.cpp
    M llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
    M llvm/lib/Target/SystemZ/SystemZInstrInfo.td

  Log Message:
  -----------
  [SystemZ] Remove most hard-coded R1D instances for sibcalls

Indirect sibling calls need to use %r1 to hold the target address.
This is currently hard-coded in many places.  This is not only
unnecessary, but makes future changes in this area difficult.

This patch now encodes the target address as operand without
hard coding a register in most places throughout the MI back-end.
Code generation still always uses %r1, but this is now decided
solely in one place in SystemZTargetLowering::LowerCall.

NFC intended.