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//===- Target.td - Define GlobalISel rules -----------------*- tablegen -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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;
}
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