[all-commits] [llvm/llvm-project] b0785c: [GlobalISel][ARM] Support missing case for G_CONST...

[Serge Pavlov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b0785cd1cbf97dbd4eb39647ff22771ef0a7cfea
      https://github.com/llvm/llvm-project/commit/b0785cd1cbf97dbd4eb39647ff22771ef0a7cfea
  Author: Serge Pavlov <sepavloff at gmail.com>
  Date:   2024-02-07 (Wed, 07 Feb 2024)

  Changed paths:
    M llvm/lib/Target/ARM/ARMInstrInfo.td
    M llvm/lib/Target/ARM/ARMInstructionSelector.cpp
    A llvm/test/CodeGen/ARM/GlobalISel/select-const.mir

  Log Message:
  -----------
  [GlobalISel][ARM] Support missing case for G_CONSTANT (#80555)

Global Instruction Selector could not select the code:

    %0:gprb(s32) = G_CONSTANT i32 -1

In DAG selector the similar code is selected to the instruction MVNi
using custom operand `mod_imm_not`. Changing its definition from
`PatLeaf` to `ImmLeaf` and providing counterpart for `imm_not_XFORM`
make the relevant rule available for GlobalISel too.