//===- Target.td - Define GlobalISel rules -----------------*- tablegen -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the target-independent interfaces used to support
// SelectionDAG instruction selection patterns (specified in
// TargetSelectionDAG.td) when generating GlobalISel instruction selectors.
//
// This is intended as a compatibility layer, to enable reuse of target
// descriptions written for SelectionDAG without requiring explicit GlobalISel
// support.  It will eventually supersede SelectionDAG patterns.
//
//===----------------------------------------------------------------------===//

// Definitions that inherit from LLT define types that will be used in the
// GlobalISel matcher.
class LLT;

def s32 : LLT;
def s64 : LLT;

// Defines a matcher for complex operands. This is analogous to ComplexPattern
// from SelectionDAG.
//
// Definitions that inherit from this may also inherit from
// GIComplexPatternEquiv to enable the import of SelectionDAG patterns involving
// those ComplexPatterns.
class GIComplexOperandMatcher<LLT type, string matcherfn> {
  // The expected type of the root of the match.
  //
  // TODO: We should probably support, any-type, any-scalar, and multiple types
  //       in the future.
  LLT Type = type;

  // The function that determines whether the operand matches. It should be of
  // the form:
  //   bool select(const MatchOperand &Root, MatchOperand &Result1)
  // and should have the same number of ResultX arguments as the number of
  // result operands. It must return true on successful match and false
  // otherwise. If it returns true, then all the ResultX arguments must be
  // overwritten.
  string MatcherFn = matcherfn;
}

// Defines a custom renderer. This is analogous to SDNodeXForm from
// SelectionDAG. Unlike SDNodeXForm, this matches a MachineInstr and
// renders directly to the result instruction without an intermediate node.
//
// Definitions that inherit from this may also inherit from GISDNodeXFormEquiv
// to enable the import of SelectionDAG patterns involving those SDNodeXForms.
class GICustomOperandRenderer<string rendererfn> {
  // The function renders the operand(s) of the matched instruction to
  // the specified instruction. It should be of the form:
  //   void render(MachineInstrBuilder &MIB, const MachineInstr &MI)
  string RendererFn = rendererfn;
}