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Merge pull request #135 from jiristefan/qtrvsim-branch-predictor
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The branch prediction demonstration developed by Jiri Stefan
in the frame of his master's thesis is welcomed step
for QtRvSim to cover more computer architectures lectures topics.
The visualization and correct/wrong prediction statistic counting matches
teaching needs of the classes when demonstrated on single-cycle processor.

For pipelined version there are more topics to discussion, see #143.
It is questionable if solution matching basic textbooks principles
on the pipelined version without classification of branched during
cache fills can be found. Probably not, but some updates would
provide better insight to the problem and code should be enhanced.

Signed-off-by: Pavel Pisa <[email protected]>
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@ppisa
ppisa committed Jul 8, 2024
2 parents 853dcc9 + e54b47d commit 0280e9e
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Showing 22 changed files with 2,594 additions and 144 deletions.
4 changes: 4 additions & 0 deletions src/gui/CMakeLists.txt
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Expand Up @@ -49,6 +49,8 @@ set(gui_SOURCES
windows/coreview/components/value_handlers.cpp
windows/coreview/components/cache.cpp
widgets/hidingtabwidget.cpp
windows/predictor/predictor_btb_dock.cpp
windows/predictor/predictor_bht_dock.cpp
)
set(gui_HEADERS
dialogs/about/aboutdialog.h
Expand Down Expand Up @@ -92,6 +94,8 @@ set(gui_HEADERS
windows/coreview/components/cache.h
helper/async_modal.h
widgets/hidingtabwidget.h
windows/predictor/predictor_btb_dock.h
windows/predictor/predictor_bht_dock.h
)
set(gui_UI
dialogs/gotosymbol/gotosymboldialog.ui
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352 changes: 271 additions & 81 deletions src/gui/dialogs/new/NewDialog.ui
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Expand Up @@ -6,8 +6,8 @@
<rect>
<x>0</x>
<y>0</y>
<width>558</width>
<height>353</height>
<width>574</width>
<height>472</height>
</rect>
</property>
<property name="windowTitle">
Expand Down Expand Up @@ -139,89 +139,279 @@
<enum>QLayout::SetDefaultConstraint</enum>
</property>
<item>
<layout class="QGridLayout" name="gridLayoutIsa">
<item row="0" column="0">
<widget class="QCheckBox" name="pipelined">
<property name="text">
<string>Pipelined</string>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QCheckBox" name="xlen_64bit">
<property name="text">
<string>XLEN 64-bit</string>
</property>
</widget>
</item>
<item row="0" column="2">
<widget class="QCheckBox" name="isa_atomic">
<property name="text">
<string>Atomic (A)</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QCheckBox" name="delay_slot">
<property name="text">
<string>Delay slot</string>
</property>
</widget>
</item>
<item row="1" column="2">
<widget class="QCheckBox" name="isa_multiply">
<property name="text">
<string>Multiply (M)</string>
</property>
</widget>
</item>
</layout>
</item>
<item>
<widget class="QGroupBox" name="hazard_unit">
<property name="title">
<string>Hazard unit</string>
</property>
<property name="checkable">
<widget class="QScrollArea" name="scroll_core">
<property name="widgetResizable">
<bool>true</bool>
</property>
<property name="checked">
<bool>false</bool>
</property>
<layout class="QVBoxLayout" name="verticalLayout_3">
<item>
<widget class="QRadioButton" name="hazard_stall">
<property name="text">
<string>Stall when hazard is detected</string>
</property>
</widget>
</item>
<item>
<widget class="QRadioButton" name="hazard_stall_forward">
<property name="text">
<string>Stall or forward when hazard is detected</string>
</property>
<property name="checked">
<bool>true</bool>
</property>
</widget>
</item>
</layout>
<widget class="QWidget" name="layout_scroll_core">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>536</width>
<height>384</height>
</rect>
</property>
<layout class="QVBoxLayout" name="verticalLayout_8">
<item>
<layout class="QGridLayout" name="gridLayoutIsa">
<item row="0" column="0">
<widget class="QCheckBox" name="pipelined">
<property name="text">
<string>Pipelined</string>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QCheckBox" name="xlen_64bit">
<property name="text">
<string>XLEN 64-bit</string>
</property>
</widget>
</item>
<item row="0" column="2">
<widget class="QCheckBox" name="isa_atomic">
<property name="text">
<string>Atomic (A)</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QCheckBox" name="delay_slot">
<property name="text">
<string>Delay slot</string>
</property>
</widget>
</item>
<item row="1" column="2">
<widget class="QCheckBox" name="isa_multiply">
<property name="text">
<string>Multiply (M)</string>
</property>
</widget>
</item>
</layout>
</item>
<item>
<widget class="QGroupBox" name="hazard_unit">
<property name="title">
<string>Hazard unit</string>
</property>
<property name="checkable">
<bool>true</bool>
</property>
<property name="checked">
<bool>false</bool>
</property>
<layout class="QVBoxLayout" name="verticalLayout_3">
<item>
<widget class="QRadioButton" name="hazard_stall">
<property name="text">
<string>Stall when hazard is detected</string>
</property>
</widget>
</item>
<item>
<widget class="QRadioButton" name="hazard_stall_forward">
<property name="text">
<string>Stall or forward when hazard is detected</string>
</property>
<property name="checked">
<bool>true</bool>
</property>
</widget>
</item>
</layout>
</widget>
</item>
<item>
<widget class="QGroupBox" name="group_branch_predictor">
<property name="title">
<string>Branch Predictor</string>
</property>
<property name="checkable">
<bool>true</bool>
</property>
<property name="checked">
<bool>true</bool>
</property>
<layout class="QVBoxLayout" name="verticalLayout_9">
<item>
<layout class="QHBoxLayout" name="layout_bp_type">
<property name="topMargin">
<number>0</number>
</property>
<item>
<widget class="QLabel" name="text_bp_type">
<property name="text">
<string>Predictor type:</string>
</property>
</widget>
</item>
<item>
<widget class="QComboBox" name="select_bp_type"/>
</item>
</layout>
</item>
<item>
<layout class="QHBoxLayout" name="layout_bp_init_state">
<property name="topMargin">
<number>0</number>
</property>
<item>
<widget class="QLabel" name="text_bp_init_state">
<property name="text">
<string>Initial state:</string>
</property>
</widget>
</item>
<item>
<widget class="QComboBox" name="select_bp_init_state"/>
</item>
</layout>
</item>
<item>
<layout class="QGridLayout" name="layout_bp_bit_settings" rowstretch="0,0,0,0">
<property name="topMargin">
<number>0</number>
</property>
<item row="3" column="2">
<widget class="QLabel" name="text_bp_bht_bits_number">
<property name="minimumSize">
<size>
<width>20</width>
<height>0</height>
</size>
</property>
<property name="text">
<string>0</string>
</property>
</widget>
</item>
<item row="2" column="0">
<widget class="QLabel" name="text_bp_bht_addr_bits">
<property name="minimumSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
<property name="text">
<string>Branch History Table (BHT) PC address bits: </string>
</property>
</widget>
</item>
<item row="0" column="0">
<widget class="QLabel" name="text_bp_btb_bits">
<property name="text">
<string>Branch Target Buffer (BTB) bits:</string>
</property>
</widget>
</item>
<item row="1" column="1">
<widget class="QSlider" name="slider_bp_bhr_bits">
<property name="maximum">
<number>8</number>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="tickPosition">
<enum>QSlider::TicksBothSides</enum>
</property>
</widget>
</item>
<item row="1" column="2">
<widget class="QLabel" name="text_bp_bhr_bits_number">
<property name="minimumSize">
<size>
<width>20</width>
<height>0</height>
</size>
</property>
<property name="text">
<string>0</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QLabel" name="text_bp_bhr_bits">
<property name="text">
<string>Branch History Register (BHR) bits:</string>
</property>
</widget>
</item>
<item row="2" column="2">
<widget class="QLabel" name="text_bp_bht_addr_bits_number">
<property name="minimumSize">
<size>
<width>20</width>
<height>0</height>
</size>
</property>
<property name="text">
<string>0</string>
</property>
</widget>
</item>
<item row="0" column="2">
<widget class="QLabel" name="text_bp_btb_bits_number">
<property name="minimumSize">
<size>
<width>20</width>
<height>0</height>
</size>
</property>
<property name="text">
<string>0</string>
</property>
</widget>
</item>
<item row="3" column="0">
<widget class="QLabel" name="text_bp_bht_bits">
<property name="text">
<string>Branch History Table (BHT) bits:</string>
</property>
</widget>
</item>
<item row="2" column="1">
<widget class="QSlider" name="slider_bp_bht_addr_bits">
<property name="maximum">
<number>8</number>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="tickPosition">
<enum>QSlider::TicksBothSides</enum>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QSlider" name="slider_bp_btb_bits">
<property name="maximum">
<number>8</number>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="invertedAppearance">
<bool>false</bool>
</property>
<property name="tickPosition">
<enum>QSlider::TicksBothSides</enum>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</widget>
</item>
</layout>
</widget>
</widget>
</item>
<item>
<spacer name="verticalSpacer">
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>20</width>
<height>40</height>
</size>
</property>
</spacer>
</item>
</layout>
</widget>
<widget class="QWidget" name="tab_memory">
Expand Down
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