BlocksALU.cc

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/*
    Copyright (c) 2002-2021 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file BlocksALU.cc
 *
 * This class resembles a single output in the Blocks CGRA architecture.
 *
 * @author Maarten Molendijk 2020 (m.j.molendijk@tue.nl)
 * @author Kanishkan Vadivel 2021 (k.vadivel@tue.nl)
 */
 
#include "BlocksALU.hh"
 
#include "ExecutionPipeline.hh"
 
using namespace TTAMachine;
/**
 * Create BlocksALU with default instructions
 *
 * @param mach The TTA machine where the ALU needs to be added.
 * @param name The name of the ALU.
 * @param sources A list of sources that are attached to this unit's input.
 * @param in1sock (shared) pointer to the TTA socket for in1 input port.
 * @param in2sock (shared) pointer to the TTA socket for in2 input port.
 */
BlocksALU::BlocksALU(
    Machine& mach, const std::string& name, std::list<std::string> sources,
    std::shared_ptr<TTAMachine::Socket> in1sock,
    std::shared_ptr<TTAMachine::Socket> in2sock)
    : BlocksFU::BlocksFU(mach, name, sources, in1sock, in2sock) {
    // Function unit and ports
    alu = this->fu;
 
    // HW ops
    ops.push_back(CreateHWOp("add", 3));
    ops.push_back(CreateHWOp("and", 3));
    ops.push_back(CreateHWOp("eq", 3));
    ops.push_back(CreateHWOp("ge", 3));
    ops.push_back(CreateHWOp("geu", 3));
    ops.push_back(CreateHWOp("gt", 3));
    ops.push_back(CreateHWOp("gtu", 3));
    ops.push_back(CreateHWOp("ior", 3));
    ops.push_back(CreateHWOp("lt", 3));
    ops.push_back(CreateHWOp("ltu", 3));
    ops.push_back(CreateHWOp("ne", 3));
    ops.push_back(CreateHWOp("not", 2));
    ops.push_back(CreateHWOp("shl1_32", 2));
    ops.push_back(CreateHWOp("shl4_32", 2));
    ops.push_back(CreateHWOp("shr1_32", 2));
    ops.push_back(CreateHWOp("shr4_32", 2));
    ops.push_back(CreateHWOp("shru1_32", 2));
    ops.push_back(CreateHWOp("shru4_32", 2));
    ops.push_back(CreateHWOp("sub", 3));
    ops.push_back(CreateHWOp("xor", 3));
    ops.push_back(CreateHWOp("copy", 2));
}
 
/**
 * Emulates second output port with copy of FU with input port sharing
 *
 * @param mach The TTA machine where the ALU pair needs to be added.
 * @param name The name of the ALU pair.
 * @param sources A list of sources that are attached to this unit's input.
 * @param usesOut0 A boolean that indicates whether output port 0 of the FU is
 * used in the CGRA.
 * @param usesOut1 A boolean that indicates whether output port 1 of the FU is
 * used in the CGRA.
 */
BlocksALUPair::BlocksALUPair(
    TTAMachine::Machine& mach, const std::string& name,
    std::list<std::string> sources, bool usesOut0, bool usesOut1)
    : sources(sources) {
    in1sock = std::make_shared<TTAMachine::Socket>(name + "_in1t");
    in2sock = std::make_shared<TTAMachine::Socket>(name + "_in2");
    mach.addSocket(*(in1sock.get()));
    mach.addSocket(*(in2sock.get()));
    if (usesOut0)
        alu0.reset(
            new BlocksALU(mach, name + "_out0", sources, in1sock, in2sock));
    if (usesOut1)
        alu1.reset(
            new BlocksALU(mach, name + "_out1", sources, in1sock, in2sock));
}
 
/**
 * Creates a hardware operation.
 *
 * @param name The name of the hardware operation. This needs to exactly match
 * the name in OSEd.
 * @param numOfOperands The number of operands that this hardware operation
 * requires.
 */
HWOperation*
BlocksALU::CreateHWOp(const std::string& name, int numOfOperands) {
    HWOperation* op = new HWOperation(name, *alu);
    BindPorts(op, numOfOperands);
    ConfigurePipeline(op->pipeline(), numOfOperands);
    return op;
}
 
/**
 * Bind the operation's operands to FU ports.
 *
 * @param hwOp A pointer to the hardware operation of which the operands need
 * to be binded to FU ports.
 * @param numOfOperands The number of operands of the given hwOp.
 */
void
BlocksALU::BindPorts(HWOperation* hwOp, int numOfOperands) {
    if (numOfOperands == 2) {
        hwOp->bindPort(1, *in1);
        hwOp->bindPort(2, *out);
    } else if (numOfOperands == 3) {
        hwOp->bindPort(1, *in1);
        hwOp->bindPort(2, *in2);
        hwOp->bindPort(3, *out);
    } else {
        // Currently no operation known that uses a different numbers of
        // operands.
        assert(
            false &&
            "Trying to add an ALU operation with a different number of "
            "operands than 2 or 3.");
    }
}
 
/**
 * Configure the operation pipeline.
 *
 * @param pipeline A pointer to the execution pipeline of the operation of
 * which the pipeline needs to be configured.
 * @param numOfOperands The number of operands of the given hwOp.
 */
void
BlocksALU::ConfigurePipeline(ExecutionPipeline* pipeline, int numOfOperands) {
    if (numOfOperands < 3) {
        pipeline->addPortRead(1, 0, 1);
        pipeline->addPortWrite(2, 0, 1);
    } else {
        pipeline->addPortRead(1, 0, 1);
        pipeline->addPortRead(2, 0, 1);
        pipeline->addPortWrite(3, 0, 1);
    }
}