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Optimizing the mMIPS. Sander Stuijk. Outline. Design flow Understanding the assembler Frequently asked questions How do I recompile the compiler? How can I abort a simulation? How can I debug the mMIPS? Where do I find the maximal frequency of my mMIPS? Assignment. Toolflow. test. - PowerPoint PPT Presentation
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technische universiteit eindhoven
Department of Electrical EngineeringElectronic Systems
Optimizing the mMIPS
Sander Stuijk
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Outline
Design flow Understanding the assembler Frequently asked questions
How do I recompile the compiler? How can I abort a simulation? How can I debug the mMIPS? Where do I find the maximal frequency of my mMIPS?
Assignment
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Toolflow
LCC CCompiler
Borland C++
Compiler
LCC CCompiler
Xilinx ISESynopsys
FPGACompiler II
SynopsysSystemCcompiler
Application(C source)
mMIPS(C++ sources
that useSystemClibraries)
test implementation
sw
hw
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Outline
Design flow Understanding the assembler Frequently asked questions
How do I recompile the compiler? How can I abort a simulation? How can I debug the mMIPS? Where do I find the maximal frequency of my mMIPS?
Assignment
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From C to assembler
int main(void)
{
int a = 0;
if (a == 0)
return 0;
else
return 1;
}
0: 00000000 nop
4: 3c1c0001 lui gp,0x1
8: 279c0000 addiu gp,gp,0
c: 3c1d0002 lui sp,0x2
10: 27bd8000 addiu sp,sp,-32768
14: 3c1e0002 lui s8,0x2
18: 27de8000 addiu s8,s8,-32768
1c: 0c000020 jal 0x80
20: 00000000 nop
24: 08000009 j 0x24
28: 00000000 nop
...
40: 08000009 j 0x24
44: 00000000 nop
...
60: 08000009 j 0x24
64: 00000000 nop
...
80: 27bdfff8 addiu sp,sp,-8
Bootloader
End of program
Actual program
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The boot loader...
0: 00000000 nop 4: 3c1c0000 lui gp,0x0 8: 279c24e2 addiu gp,gp,9442
c: 3c1d0000 lui sp,0x0 10: 27bd2800 addiu sp,sp,10240
14: 3c1e0000 lui s8,0x0 18: 27de2800 addiu s8,s8,10240 1c: 0c000020 jal 0x80 20: 00000000 nop 24: 08000009 j 0x24 ... 40: 08000009 j 0x24 ... 60: 08000009 j 0x24
The program is terminated by a repeated jump to address 0x24. We can stop the simulation by detecting this jump.
Skip first instruction
Global pointer
Stack pointer
Frame pointer
Call main function
Terminate program
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Outline
Design flow Understanding the assembler Frequently asked questions
How do I recompile the compiler? How can I abort a simulation? How can I debug the mMIPS? Where do I find the maximal frequency of my mMIPS?
Assignment
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How do I recompile the LCC compiler?
1. export LCCDIR=/cygdrive/c/ImageProcessing/lcc/lccdir
2. cd $LCCDIR/..
3. make clean
4. make
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How can I abort a simulation?
Use <ctrl>+<c> to abort a running simulation. VCD trace stored till point at which simulation is stopped.
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How can I debug the mMIPS?
Create a small test program to check the newly added functionality Create a VCD trace via a simulation Compare the VCD trace with the assembler
Start at the beginning of the program Does it do what you expect?
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Where do I find the maximal frequency of my mMIPS?
You can find the maximal frequency of your design in XilinX ISE Estimate is given by FPGA II Compiler
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Outline
Design flow Understanding the assembler Frequently asked questions
How do I recompile the compiler? How can I abort a simulation? How can I debug the mMIPS? Where do I find the maximal frequency of my mMIPS?
Assignment
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Assignment
Optimize the run-time of an image processing algorithm running on the mMIPS.
AllowedAdd special instructions to the mMIPS;Change design of the mMIPS (e.g. forwarding).
Not-allowedModification of the image processing algorithm that are not needed to use special instructions (e.g. replace multiply with shifts).
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Testing and implementing the design
Test for functional correctnessRun the original mMIPS with the algorithm to produce a reference output.
Compare the results of your mMIPS to the reference output.
Implement your design on the FPGAYou must complete the flow till the FPGA. The maximum clock frequency at which your mMIPS can be synthesized is part of the performance.
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Submitting your results
1. Login to ftp://ftp.es.ele.tue.nl using your username/password
2. Put all .cpp and .h files in the directory ‘final’
3. Put ‘mips_rom.bin’ and ‘mips_ram.bin’ in the directory ‘final’
Remarks We need a working mMIPS to test your changes Put all files directly in the directory ‘final’ do not use subdirectories The input/output locations of your image must be the same as in our
program Your input image is automatically replaced with a new image by our
tools
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Important dates
Test program available on Sunday 5/3 at 12.00h http://www.es.ele.tue.nl/education/Computation/oo2/
Submit results at Tuesday 7/3 before 12.00h Make sure you submit before the deadline. It’s a hard deadline!
Presentations on Thursday 9/3 and Friday 10/3 You will be informed about the schedule
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Support and Information
Dominic Gawlowski - FPGAValentin Gheorghita - LCCSander Stuijk - SystemC
Each Monday, Tuesday, Thursday and Friday between 14.00 and 16.00h.
Look also at http://www.es.ele.tue.nl/education/Computation/oo2/ for information, tips, etc.
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Questions?
