66 lines
2.8 KiB
TableGen
66 lines
2.8 KiB
TableGen
|
//===- 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:
|
||
|
|
// ComplexRendererFn select(MachineOperand &Root) const;
|
||
|
|
// where Root is the root of the match. The function should return nullptr
|
||
|
|
// on match failure, or a ComplexRendererFn that renders the operand in case
|
||
|
|
// of a successful match.
|
||
|
|
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,
|
||
|
|
// int OpIdx = -1)
|
||
|
|
//
|
||
|
|
// If OpIdx is specified (i.e. not invalid/negative), this
|
||
|
|
// references the source operand MI.getOperand(OpIdx). Otherwise,
|
||
|
|
// this is the value defined by MI. This is to support the case
|
||
|
|
// where there is no corresponding instruction to match.
|
||
|
|
string RendererFn = rendererfn;
|
||
|
|
}
|