[all-commits] [llvm/llvm-project] 3d69bb: Allow MAY(R)? to accept the high components of reg...

[Dominik Steenken via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3d69bbc35158822c9e1371b5c37a24213a8a81fc
      https://github.com/llvm/llvm-project/commit/3d69bbc35158822c9e1371b5c37a24213a8a81fc
  Author: Dominik Steenken <dost at de.ibm.com>
  Date:   2024-07-18 (Thu, 18 Jul 2024)

  Changed paths:
    M llvm/lib/Target/SystemZ/SystemZInstrHFP.td
    M llvm/test/MC/SystemZ/insn-bad.s
    M llvm/test/MC/SystemZ/insn-good.s

  Log Message:
  -----------
  Allow MAY(R)? to accept the high components of register pairs (#98606)

The HFP instructions `MAY` and `MAYR`, unlike any other floating point
instructions, allow the specification of a 128bit register pair by
either the lower-numbered or the higher-numbered component register. In
order to support this, but change as little about codegen as possible,
the existing `MAY(R)?` definition is made `CodeGenOnly`, while a copy is
provided for the assembler and disassembler, which simply accepts a
64bit floating point register in place of the 128bit one. This copy is
stripped of its pattern to prevent codegen from using it.
The corresponding assembly tests that checked the register specification
rule that this commit removes from `MAY(R)?` have also been removed.



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