Motorola DSP56305 Manuel d'utilisateur Page 111
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
C-8 Optimizing DSP56300/DSP56600 Applications MOTOROLA
Using the Profiler
C.3.8 Subroutine Call Report
This section exists only in the Postscript profile report. It illustrates
the relationships between the subroutines that have been active
during program simulation. Each such subroutine appears as a
node in a graph. Nodes are connected using directed edges, which
correspond to the caller/callee relationships. Subroutines that have
not been invoked during program simulation will not appear in this
graph.
C.4 USING THE PROFILE REPORT
The profile report aids the DSP software and system developer in
choosing where to concentrate the optimization efforts. It also can
help in debugging the DSP software. For profiling results to be
meaningful they must be based on simulation of the DSP program
using relevant input data. The first step is, therefore, to identify the
relevant input data sets, assemble the DSP program (using the -g
option) and execute the program on the simulator profiler. The
profile report that is generated can then serve as a powerful tool for
selecting the code sections to be optimized.
The profiler report provides a variety of metrics which can improve
the DSP programmer’s understanding of the program’s
characteristics. Several sections of the report can be of useful in
applying specific debug and optimization steps. The code coverage
report highlights the code sections that are most frequently
executed. Optimization efforts that are aimed to reduce cycle and
power consumption can best be concentrated on these code
sections. The code coverage report can also help in writing
conditional jumps so that the most frequently taken jump directions
take fewer clock cycles. The report section that correlates memory
accesses with program symbols can help catch strayed memory
accesses. Unused memory variables or variables set but not used
can also be found based on this report. The instruction set usage
report indicates the level of instruction-level parallelism that has
been achieved in the program code.
- DSP56300/DSP56600 1
- Digital Signal 1
- Processors 1
- TABLE OF CONTENTS 2
- LIST OF FIGURES 6
- LIST OF TABLES 7
- INTRODUCTION 8
- 1.2 DSP56600 CORE FAMILY 9
- Table 1-1 11
- Introduction 12
- Description and Use 13
- Application Note Structure 14
- 1.4.3 Appendixes 15
- DATA OPERATIONS 16
- DSP56300 Family Manual 21
- 2.3 THE MAX INSTRUCTION 22
- 2.4 USING THE BARREL SHIFTER 23
- Data Operations 24
- Using the barrel shifter 24
- DSP56300 26
- DSP56600 Family 26
- Double precision arithmetic 27
- INSTRUCTIONS 28
- PROGRAM CONTROL 30
- Program Control 31
- Hardware Loops 31
- 3.2 THE HARDWARE STACK 32
- DSP56600 Family Manuals 35
- 3.3 USING THE STACK EXTENSION 36
- Using the Stack Extension 37
- EXTENSION 39
- Conditional DALU Instructions 40
- 3.6 PC RELATIVE INSTRUCTIONS 42
- DSP56600 Family Manual 43
- 3.7 USING FAST INTERRUPTS 46
- Using Fast Interrupts 48
- USING THE DMA 50
- Using the DMA 51
- Using Slow, Low-Cost Memories 54
- 4.4 SERVICING A PERIPHERAL 55
- Servicing a Peripheral 56
- Section 5 62
- 5.1 THE INSTRUCTION CACHE 62
- 5.1.1 Cache Sectors 64
- The Instruction Cache 65
- 5.1.3 Cache Burst Mode 67
- 5.2 MEMORY SWITCH 70
- Memory Switch 71
- 5.3 USING THE BOOTSTRAP ROM 72
- Using the Bootstrap ROM 73
- PIPELINE INTERLOCKS 74
- Pipeline Interlocks 75
- Data ALU Pipeline Interlocks 75
- DSP56000 Family Manual 76
- INTERLOCKS 80
- Interlocks 80
- 6.3 STACK EXTENSION DELAYS 81
- Interlocks? 83
- COMPACT OPCODE USE 86
- Instructions 87
- Compact Opcode Use 89
- Cycle Count of an Instruction 89
- 7.2 ADDRESSING MODES 90
- 7.2.2 Short Addressing Mode 91
- 7.2.3 Short Immediate Mode 91
- 7.2.5 Register Addressing 92
- 7.2.6 Word Count 92
- 7.3 PERIPHERAL ADDRESSING 92
- 7.4 SPECIAL INSTRUCTIONS 93
- 7.4.1 Dual Data Spaces 93
- 7.4.3 Clearing Registers 94
- Special Instructions 95
- SAVING POWER 96
- A.1.2 Stop Standby Mode 97
- A.1.3 Low-Power Clock Divider 97
- Saving Power 98
- Disabling Functional Blocks 98
- DEBUG AND TEST SUPPORT 100
- B.2 JTAG PORT FEATURES 101
- B.3 ADDRESS TRACING 102
- Debug and Test Support 103
- Address Tracing 103
- USING THE PROFILER 104
- C.3 THE PROFILING REPORT 105
- C.3.1 Basic Report 105
- C.3.2 Symbol Report 106
- Using the Profiler 107
- C.3.4 Code Coverage Report 108
- C.3.5 Basic Subroutine Report 109
- C.3.8 Subroutine Call Report 111
- C.4 USING THE PROFILE REPORT 111
- How to reach us: 112
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