[PATCH] D146185: [SystemZ] Allow any I5 in RotateSelect*

[Ilya Leoshkevich via Phabricator via llvm-commits]

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For all RotateSelect* instructions, PoP says:

  Bits 0-1 of the I5 field (bits 32-33 of the instruction) are
  ignored.

LLVM, however, completely prohibits using them, e.g.:

  error: invalid operand for instruction
  asm("rxsbg %[r1],%[r2],177,43,228\n"

Lift this unnecessary restriction.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146185

Files:
  llvm/lib/Target/SystemZ/SystemZInstrFormats.td
  llvm/test/MC/SystemZ/insn-bad-z196.s
  llvm/test/MC/SystemZ/insn-bad-zEC12.s
  llvm/test/MC/SystemZ/insn-bad.s
  llvm/test/MC/SystemZ/insn-good-z196.s
  llvm/test/MC/SystemZ/insn-good-zEC12.s
  llvm/test/MC/SystemZ/insn-good.s

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