Differential D29933 Diff 119619 llvm/trunk/lib/Target/RISCV/RISCVISelDAGToDAG.cpp

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llvm/trunk/lib/Target/RISCV/RISCVISelDAGToDAG.cpp

		1		//===-- RISCVISelDAGToDAG.cpp - A dag to dag inst selector for RISCV ------===//
		2		//
		3		// The LLVM Compiler Infrastructure
		4		//
		5		// This file is distributed under the University of Illinois Open Source
		6		// License. See LICENSE.TXT for details.
		7		//
		8		//===----------------------------------------------------------------------===//
		9		//
		10		// This file defines an instruction selector for the RISCV target.
		11		//
		12		//===----------------------------------------------------------------------===//
		13
		14		#include "RISCV.h"
		15		#include "MCTargetDesc/RISCVMCTargetDesc.h"
		16		#include "RISCVTargetMachine.h"
		17		#include "llvm/CodeGen/SelectionDAGISel.h"
		18		#include "llvm/Support/Debug.h"
		19		#include "llvm/Support/MathExtras.h"
		20		#include "llvm/Support/raw_ostream.h"
		21		using namespace llvm;
		22
		23		#define DEBUG_TYPE "riscv-isel"
		24
		25		// RISCV-specific code to select RISCV machine instructions for
		26		// SelectionDAG operations.
		27		namespace {
		28		class RISCVDAGToDAGISel final : public SelectionDAGISel {
		29		public:
		30		explicit RISCVDAGToDAGISel(RISCVTargetMachine &TargetMachine)
		31		: SelectionDAGISel(TargetMachine) {}
		32
		33		StringRef getPassName() const override {
		34		return "RISCV DAG->DAG Pattern Instruction Selection";
		35		}
		36
		37		void Select(SDNode *Node) override;
		38
		39		// Include the pieces autogenerated from the target description.
		40		#include "RISCVGenDAGISel.inc"
		41		};
		42		}
		43
		44		void RISCVDAGToDAGISel::Select(SDNode *Node) {
		45		// Dump information about the Node being selected.
		46		DEBUG(dbgs() << "Selecting: "; Node->dump(CurDAG); dbgs() << "\n");
		47
		48		// If we have a custom node, we have already selected
		49		if (Node->isMachineOpcode()) {
		50		DEBUG(dbgs() << "== "; Node->dump(CurDAG); dbgs() << "\n");
		51		Node->setNodeId(-1);
		52		return;
		53		}
		54
		55		// Select the default instruction.
		56		SelectCode(Node);
		57		}
		58
		59		// This pass converts a legalized DAG into a RISCV-specific DAG, ready
		60		// for instruction scheduling.
		61		FunctionPass *llvm::createRISCVISelDag(RISCVTargetMachine &TM) {
		62		return new RISCVDAGToDAGISel(TM);
		63		}