Coreview multiplexers updated and added for branch compare forward.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>

9 files changed, 251 insertions, 32 deletions

diff --git a/qtmips_gui/coreview.cpp b/qtmips_gui/coreview.cpp
index 242c416..061a3ec 100644
--- a/qtmips_gui/coreview.cpp
+++ b/qtmips_gui/coreview.cpp
@@ -65,6 +65,14 @@
         connect(machine->core(), &machine::Core::SIG, \
                 VAR, &coreview::MultiText::multitext_update); \
     } while(false)
+#define NEW_MUX(VAR, X, Y, SIG, ...) do { \
+        NEW(Multiplexer, VAR, X, Y, __VA_ARGS__); \
+        connect(machine->core(), SIGNAL(SIG(std::uint32_t)), VAR, SLOT(set(std::uint32_t))); \
+    } while(false)
+#define NEW_MINIMUX(VAR, X, Y, SIG, ...) do { \
+        NEW(MiniMux, VAR, X, Y, __VA_ARGS__); \
+        connect(machine->core(), SIGNAL(SIG(std::uint32_t)), VAR, SLOT(set(std::uint32_t))); \
+    } while(false)
 
 CoreViewScene::CoreViewScene(machine::QtMipsMachine *machine) : QGraphicsScene() {
     setSceneRect(0, 0, SC_WIDTH, SC_HEIGHT);
@@ -85,7 +93,7 @@ CoreViewScene::CoreViewScene(machine::QtMipsMachine *machine) : QGraphicsScene()
     NEW_B(Constant, ft.adder_4, ft.adder->connector_in_b(), "4");
     NEW(Junction, ft.junc_pc, 80, mem_program->connector_address()->y());
     NEW(Junction, ft.junc_pc_4, 130, 380);
-    NEW(Multiplexer, ft.multiplex, 20, 390, 2);
+    NEW_MUX(ft.multiplex, 20, 390, fetch_branch_value, 2);
     // Decode stage
     NEW(LogicBlock, dc.ctl_block, 230, 90, {"Control", "unit"});
     dc.ctl_block->setSize(35, 70);
@@ -94,7 +102,7 @@ CoreViewScene::CoreViewScene(machine::QtMipsMachine *machine) : QGraphicsScene()
     NEW(Adder, dc.add, 340, 428);
     const coreview::Connector *dc_con_sign_ext = dc.sign_ext->new_connector(1, 0);
     NEW(Junction, dc.j_sign_ext, 290, dc_con_sign_ext->y());
-    NEW(LogicBlock, dc.cmp, 320, 200, "=");
+    NEW(LogicBlock, dc.cmp, 312, 200, "=");
     NEW(And, dc.and_branch, 350, 190);
     dc.cmp->setSize(24, 12);
     NEW(Junction, dc.j_inst_up, 190, 126);
@@ -103,8 +111,8 @@ CoreViewScene::CoreViewScene(machine::QtMipsMachine *machine) : QGraphicsScene()
     NEW(Junction, dc.j_jump_reg, 355, 94);
     // Execute stage
     NEW(Junction, ex.j_mux, 450, 303);
-    NEW(Multiplexer, ex.mux_imm, 470, 292, 2, true);
-    NEW(Multiplexer, ex.mux_regdest, 480, 370, 2, true);
+    NEW_MUX(ex.mux_imm, 470, 292, execute_alusrc_value, 2, true);
+    NEW_MUX(ex.mux_regdest, 480, 370, execute_regdest_value, 2, true);
     // Memory
     NEW(Junction, mm.j_addr, 570, mem_data->connector_address()->y());
     static QMap<std::uint32_t, QString> excause_map =
@@ -123,7 +131,7 @@ CoreViewScene::CoreViewScene(machine::QtMipsMachine *machine) : QGraphicsScene()
     NEW_MULTI(mm.multi_excause, 602, 447, memory_excause_value, excause_map, true);
     new_label("Exception", 595, 437);
     // WriteBack stage
-    NEW(Multiplexer, wb.mem_or_reg, 690, 252, 2, true);
+    NEW_MUX(wb.mem_or_reg, 690, 252, writeback_memtoreg_value, 2, true);
     NEW(Junction, wb.j_reg_write_val, 411, 510);
 
     // Connections //
@@ -204,7 +212,7 @@ CoreViewScene::CoreViewScene(machine::QtMipsMachine *machine) : QGraphicsScene()
     NEW_V(560, 260, memory_alu_value, true); // Alu output
     NEW_V(560, 345, memory_rt_value, true); // rt
     NEW_V(650, 290, memory_mem_value, true); // Memory output
-    NEW_V(570, 113, execute_memtoreg_value, false, 1);
+    NEW_V(570, 113, memory_memtoreg_value, false, 1);
     NEW_V(630, 220, memory_memwrite_value, false, 1);
     NEW_V(620, 220, memory_memread_value, false, 1);
     // Write back stage
@@ -377,12 +385,13 @@ CoreViewScenePipelined::CoreViewScenePipelined(machine::QtMipsMachine *machine)
     struct coreview::Latch::ConnectorPair lp_dc_rt = latch_id_ex->new_connector(regs->connector_read2()->y() - latch_id_ex->y());
     coreview::Bus *regs_bus1 = new_bus(regs->connector_read1(), lp_dc_rs.in);
     coreview::Bus *regs_bus2 = new_bus(regs->connector_read2(), lp_dc_rt.in);
-    //if (machine->config().hazard_unit() == machine::MachineConfig::HU_NONE) {
-        const coreview::Connector *regs_bus_con = dc.cmp->new_connector(-0.5, 1);
+    const coreview::Connector *regs_bus_con;
+    if (machine->config().hazard_unit() != machine::MachineConfig::HU_STALL_FORWARD) {
+        regs_bus_con = dc.cmp->new_connector(-0.5, 1);
         new_bus(regs_bus1->new_connector(regs_bus_con->point(), coreview::Connector::AX_Y), regs_bus_con);
         regs_bus_con = dc.cmp->new_connector(0.5, 1);
         new_bus(regs_bus2->new_connector(regs_bus_con->point(), coreview::Connector::AX_Y), regs_bus_con);
-    //} // TODO else
+    }
     struct coreview::Latch::ConnectorPair lp_dc_immed = latch_id_ex->new_connector(dc.j_sign_ext->y() - latch_id_ex->y());
     new_bus(dc.j_sign_ext->new_connector(coreview::Connector::AX_X), lp_dc_immed.in);
     struct coreview::Latch::ConnectorPair regdest_dc_rt = latch_id_ex->new_connector(ex.mux_regdest->connector_in(0)->point().y() - latch_id_ex->y());
@@ -489,8 +498,10 @@ CoreViewScenePipelined::CoreViewScenePipelined(machine::QtMipsMachine *machine)
     NEW_V(610, 385, memory_regw_num_value, false, 2, 0, 10);
 
     if (machine->config().hazard_unit() == machine::MachineConfig::HU_STALL_FORWARD) {
-        NEW(Multiplexer, hu.mux_alu_reg_a, 430, 232, 3, false);
-        NEW(Multiplexer, hu.mux_alu_reg_b, 430, 285, 3, false);
+        NEW_MUX(hu.mux_alu_reg_a, 430, 232, execute_reg1_ff_value, 3, false);
+        NEW_MUX(hu.mux_alu_reg_b, 430, 285, execute_reg2_ff_value, 3, false);
+        NEW_MINIMUX(hu.mux_branch_reg_a, 296, 228, forward_m_d_rs_value, 2, false);
+        NEW_MINIMUX(hu.mux_branch_reg_b, 314, 228, forward_m_d_rt_value, 2, false);
         NEW(Junction, hu.j_alu_out, 420, 490);
 
         con = new_bus(lp_dc_rs.out, hu.mux_alu_reg_a->connector_in(0));
@@ -507,11 +518,17 @@ CoreViewScenePipelined::CoreViewScenePipelined(machine::QtMipsMachine *machine)
         con = new_bus(hu.j_alu_out->new_connector(CON_AX_Y), hu.mux_alu_reg_a->connector_in(2));
         con = new_bus(hu.j_alu_out->new_connector(CON_AX_Y), hu.mux_alu_reg_b->connector_in(2));
 
-        con = new_bus(hu.j_alu_out->new_connector(CON_AX_X), dc.cmp->new_connector(-0.5, 1));
+        con = new_bus(hu.j_alu_out->new_connector(CON_AX_X), hu.mux_branch_reg_a->connector_in(1));
         con->setAxes({CON_AXIS_Y(380), CON_AXIS_X(330)});
-        con = new_bus(hu.j_alu_out->new_connector(CON_AX_X), dc.cmp->new_connector(0.5, 1));
+        con = new_bus(hu.j_alu_out->new_connector(CON_AX_X), hu.mux_branch_reg_b->connector_in(1));
         con->setAxes({CON_AXIS_Y(380), CON_AXIS_X(330)});
 
+        new_bus(regs_bus1->new_connector(hu.mux_branch_reg_a->connector_in(0)->point(), coreview::Connector::AX_Y), hu.mux_branch_reg_a->connector_in(0));
+        new_bus(regs_bus2->new_connector(hu.mux_branch_reg_b->connector_in(0)->point(), coreview::Connector::AX_Y), hu.mux_branch_reg_b->connector_in(0));
+
+        con = new_bus(hu.mux_branch_reg_a->connector_out(), dc.cmp->new_connector(-0.75, 1));
+        con = new_bus(hu.mux_branch_reg_b->connector_out(), dc.cmp->new_connector(0.75, 1));
+
         struct coreview::Latch::ConnectorPair regdest_dc_rs = latch_id_ex->new_connector(ex.mux_regdest->connector_in(0)->point().y() - latch_id_ex->y() - 8);
         new_bus(dc.instr_bus->new_connector(0, ex.mux_regdest->connector_in(0)->y() - 8), regdest_dc_rs.in, 2);
         new_label("RsE", 427, 364);
@@ -519,12 +536,11 @@ CoreViewScenePipelined::CoreViewScenePipelined(machine::QtMipsMachine *machine)
         NEW(Junction, ex.j_rs_num, 442, 372);
         new_bus(regdest_dc_rs.out, ex.j_rs_num->new_connector(coreview::Connector::AX_X), 2);
 
+        NEW_V(434, 227, execute_reg1_ff_value, false, 1); // Register 1 forward to ALU
+        NEW_V(434, 280, execute_reg2_ff_value, false, 1); // Register 2 forward to ALU
 
-        NEW_V(434, 250, execute_reg1_ff_value, false, 1); // Register 1 forward to ALU
-        NEW_V(434, 303, execute_reg2_ff_value, false, 1); // Register 2 forward to ALU
-
-        NEW_V(312, 290, forward_m_d_rs_value, false, 1); // Register 1 forward for bxx and jr, jalr
-        NEW_V(327, 290, forward_m_d_rt_value, false, 1); // Register 2 forward for beq, bne
+        NEW_V(291, 230, forward_m_d_rs_value, false, 1); // Register 1 forward for bxx and jr, jalr
+        NEW_V(333, 230, forward_m_d_rt_value, false, 1); // Register 2 forward for beq, bne
 
     }
 }
diff --git a/qtmips_gui/coreview.h b/qtmips_gui/coreview.h
index 93c0032..e788d26 100644
--- a/qtmips_gui/coreview.h
+++ b/qtmips_gui/coreview.h
@@ -43,6 +43,7 @@
 #include "coreview/connection.h"
 #include "coreview/programcounter.h"
 #include "coreview/multiplexer.h"
+#include "coreview/minimux.h"
 #include "coreview/latch.h"
 #include "coreview/alu.h"
 #include "coreview/adder.h"
@@ -114,6 +115,8 @@ protected:
         coreview::Multiplexer *mux_alu_reg_b;
         coreview::Junction *j_alu_out;
         coreview::MultiText *multi_stall;
+        coreview::MiniMux *mux_branch_reg_a;
+        coreview::MiniMux *mux_branch_reg_b;
     } hu;
 
     coreview::Connection *new_connection(const coreview::Connector*, const coreview::Connector*);
diff --git a/qtmips_gui/coreview/minimux.cpp b/qtmips_gui/coreview/minimux.cpp
new file mode 100644
index 0000000..debd820
--- /dev/null
+++ b/qtmips_gui/coreview/minimux.cpp
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*******************************************************************************
+ * QtMips - MIPS 32-bit Architecture Subset Simulator
+ *
+ * Implemented to support following courses:
+ *
+ *   B35APO - Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b35apo
+ *
+ *   B4M35PAP - Advanced Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
+ *
+ * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
+ * Copyright (c) 2019      Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ *
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University        (http://www.cvut.cz/)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ ******************************************************************************/
+
+#include "minimux.h"
+#include <cmath>
+
+using namespace coreview;
+
+//////////////////////
+#define WIDTH 6
+#define HEIGHT 8
+#define GAP 8
+#define PENW 1
+//////////////////////
+
+MiniMux::MiniMux(unsigned size, bool ctl_up): QGraphicsObject(nullptr) {
+    this->size = size;
+    seton = -1;
+    ctlfrom = ctl_up;
+    con_ctl = new Connector(Connector::AX_X);
+    con_out = new Connector(Connector::AX_Y);
+    con_in = new Connector*[size];
+    for (unsigned i = 0; i < size; i++)
+        con_in[i] = new Connector(Connector::AX_Y);
+    setPos(x(), y()); // Set connectors possitions
+}
+
+MiniMux::~MiniMux() {
+    delete con_ctl;
+    delete con_out;
+    for (unsigned i = 0; i < size; i++)
+        delete con_in[i];
+    delete[] con_in;
+}
+
+#define C_WIDTH (WIDTH + (GAP * (size -1 )))
+
+QRectF MiniMux::boundingRect() const {
+    return QRectF(-PENW / 2, -PENW / 2, C_WIDTH + PENW, WIDTH + PENW);
+}
+
+void MiniMux::paint(QPainter *painter, const QStyleOptionGraphicsItem *option __attribute__((unused)), QWidget *widget __attribute__((unused))) {
+    painter->setPen(QPen(QColor(200, 200, 200), 2));
+    if (seton >= 0 && seton < (int)size)
+        painter->drawLine((WIDTH / 2) + (seton * GAP), HEIGHT, C_WIDTH / 2, 0);
+
+    painter->setPen(QColor(0, 0, 0));
+    const QPointF poly[] = {
+        QPointF(0, HEIGHT),
+        QPointF(HEIGHT / 2, 0),
+        QPointF(C_WIDTH - (HEIGHT / 2), 0),
+        QPointF(C_WIDTH, HEIGHT)
+    };
+    painter->drawPolygon(poly, sizeof(poly) / sizeof(QPointF));
+}
+
+void MiniMux::setPos(qreal x, qreal y) {
+    QGraphicsItem::setPos(x, y);
+    /*if (ctlfrom)
+        con_ctl->setPos(x + (WIDTH / 2), y + (WIDTH / 4));
+    else
+        con_ctl->setPos(x + (WIDTH / 2), y + C_HEIGHT - (WIDTH / 4));
+    */
+    con_out->setPos(x + (C_WIDTH / 2), y);
+    for (unsigned i = 0; i < size; i++)
+        con_in[i]->setPos(x + (WIDTH / 2) + (i * GAP), y + HEIGHT);
+}
+
+const Connector *MiniMux::connector_ctl() const {
+    return con_ctl;
+}
+
+const Connector *MiniMux::connector_out() const {
+    return con_out;
+}
+
+const Connector *MiniMux::connector_in(unsigned i) const {
+    SANITY_ASSERT(i < size, "MiniMux: requested out of range input connector");
+    return con_in[i];
+}
+
+void MiniMux::set(std::uint32_t i) {
+    if (seton != (int)i) {
+        seton = (int)i;
+        update();
+    }
+}
+
diff --git a/qtmips_gui/coreview/minimux.h b/qtmips_gui/coreview/minimux.h
new file mode 100644
index 0000000..9cc446f
--- /dev/null
+++ b/qtmips_gui/coreview/minimux.h
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*******************************************************************************
+ * QtMips - MIPS 32-bit Architecture Subset Simulator
+ *
+ * Implemented to support following courses:
+ *
+ *   B35APO - Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b35apo
+ *
+ *   B4M35PAP - Advanced Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
+ *
+ * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
+ * Copyright (c) 2019      Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ *
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University        (http://www.cvut.cz/)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ ******************************************************************************/
+
+#ifndef COREVIEW_MINIMUX_H
+#define COREVIEW_MINIMUX_H
+
+#include <QGraphicsObject>
+#include "qtmipsexception.h"
+#include "connection.h"
+
+namespace coreview {
+
+class MiniMux : public  QGraphicsObject {
+    Q_OBJECT
+public:
+    MiniMux(unsigned size, bool ctl_up = false);
+    ~MiniMux();
+
+    QRectF boundingRect() const;
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+
+    void setPos(qreal x, qreal y);
+    const Connector *connector_ctl() const; // Control input
+    const Connector *connector_out() const; // Output
+    const Connector *connector_in(unsigned i) const; // Inputs
+
+public slots:
+    void set(std::uint32_t i); // Set what value should be set as connected (indexing from  1 where 0 is no line)
+
+private:
+    bool ctlfrom;
+    unsigned size;
+    int seton;
+    Connector *con_ctl, *con_out, **con_in;
+};
+
+}
+
+#endif // COREVIEW_MINIMUX_H
diff --git a/qtmips_gui/coreview/multiplexer.cpp b/qtmips_gui/coreview/multiplexer.cpp
index f0eebef..bd2fbd9 100644
--- a/qtmips_gui/coreview/multiplexer.cpp
+++ b/qtmips_gui/coreview/multiplexer.cpp
@@ -45,9 +45,9 @@ using namespace coreview;
 #define PENW 1
 //////////////////////
 
-Multiplexer::Multiplexer(unsigned size, bool ctl_up) {
+Multiplexer::Multiplexer(unsigned size, bool ctl_up): QGraphicsObject(nullptr) {
     this->size = size;
-    seton = 0;
+    seton = -1;
     ctlfrom = ctl_up;
     con_ctl = new Connector(Connector::AX_Y);
     con_out = new Connector(Connector::AX_X);
@@ -72,9 +72,9 @@ QRectF Multiplexer::boundingRect() const {
 }
 
 void Multiplexer::paint(QPainter *painter, const QStyleOptionGraphicsItem *option __attribute__((unused)), QWidget *widget __attribute__((unused))) {
-    painter->setPen(QColor(200, 200, 200));
-    if (seton > 0 && seton <= size)
-        painter->drawLine(0, (HEIGHT / 2) + ((seton - 1) * GAP), WIDTH, C_HEIGHT / 2);
+    painter->setPen(QPen(QColor(200, 200, 200), 2));
+    if (seton >= 0 && seton < (int)size)
+        painter->drawLine(0, (HEIGHT / 2) + (seton * GAP), WIDTH, C_HEIGHT / 2);
 
     painter->setPen(QColor(0, 0, 0));
     const QPointF poly[] = {
@@ -110,8 +110,10 @@ const Connector *Multiplexer::connector_in(unsigned i) const {
     return con_in[i];
 }
 
-void Multiplexer::set(unsigned i) {
-    seton = i;
-    update();
+void Multiplexer::set(std::uint32_t i) {
+    if (seton != (int)i) {
+        seton = (int)i;
+        update();
+    }
 }
 
diff --git a/qtmips_gui/coreview/multiplexer.h b/qtmips_gui/coreview/multiplexer.h
index 5de5184..0ba8cd9 100644
--- a/qtmips_gui/coreview/multiplexer.h
+++ b/qtmips_gui/coreview/multiplexer.h
@@ -36,13 +36,14 @@
 #ifndef COREVIEW_MULTIPLEXER_H
 #define COREVIEW_MULTIPLEXER_H
 
-#include <QGraphicsItem>
+#include <QGraphicsObject>
 #include "qtmipsexception.h"
 #include "connection.h"
 
 namespace coreview {
 
-class Multiplexer : public QGraphicsItem {
+class Multiplexer : public  QGraphicsObject {
+    Q_OBJECT
 public:
     Multiplexer(unsigned size, bool ctl_up = false);
     ~Multiplexer();
@@ -55,11 +56,13 @@ public:
     const Connector *connector_out() const; // Output
     const Connector *connector_in(unsigned i) const; // Inputs
 
-    void set(unsigned i); // Set what value should be set as connected (indexing from  1 where 0 is no line)
+public slots:
+    void set(std::uint32_t i); // Set what value should be set as connected (indexing from  1 where 0 is no line)
 
 private:
     bool ctlfrom;
-    unsigned size, seton;
+    unsigned size;
+    int seton;
     Connector *con_ctl, *con_out, **con_in;
 };
 
diff --git a/qtmips_gui/qtmips_gui.pro b/qtmips_gui/qtmips_gui.pro
index 905bdba..c0fbb70 100644
--- a/qtmips_gui/qtmips_gui.pro
+++ b/qtmips_gui/qtmips_gui.pro
@@ -67,7 +67,8 @@ SOURCES += \
     fontsize.cpp \
     gotosymboldialog.cpp \
     cop0dock.cpp \
-    hinttabledelegate.cpp
+    hinttabledelegate.cpp \
+    coreview/minimux.cpp
 
 HEADERS += \
         mainwindow.h \
@@ -107,7 +108,8 @@ HEADERS += \
     fontsize.h \
     gotosymboldialog.h \
     cop0dock.h \
-    hinttabledelegate.h
+    hinttabledelegate.h \
+    coreview/minimux.h
 
 FORMS += \
         NewDialog.ui \
diff --git a/qtmips_machine/core.cpp b/qtmips_machine/core.cpp
index dead427..9e285a4 100644
--- a/qtmips_machine/core.cpp
+++ b/qtmips_machine/core.cpp
@@ -548,6 +548,7 @@ void Core::writeback(const struct dtMemory &dt) {
     emit writeback_inst_addr_value(dt.is_valid? dt.inst_addr: STAGEADDR_NONE);
     emit instruction_writeback(dt.inst, dt.inst_addr, dt.excause, dt.is_valid);
     emit writeback_value(dt.towrite_val);
+    emit writeback_memtoreg_value(dt.memtoreg);
     emit writeback_regw_value(dt.regwrite);
     emit writeback_regw_num_value(dt.rwrite);
     if (dt.regwrite)
diff --git a/qtmips_machine/core.h b/qtmips_machine/core.h
index 86adcfa..8672850 100644
--- a/qtmips_machine/core.h
+++ b/qtmips_machine/core.h
@@ -158,6 +158,7 @@ signals:
     void memory_excause_value(std::uint32_t);
     void writeback_inst_addr_value(std::uint32_t);
     void writeback_value(std::uint32_t);
+    void writeback_memtoreg_value(std::uint32_t);
     void writeback_regw_value(std::uint32_t);
     void writeback_regw_num_value(std::uint32_t);