代写代考 CSC451 Project 6 Register Allocation

CSC451 Project 6 Register Allocation
Goal Implement register allocation based on graph coloring. Download the Project Tests
Download and unzip the tests W for this project under $j/j–.
Run the following command inside the $j/j– directory to compile the j– compiler with your changes:

To compile a j– program P.java for the MIPS target, using register allocation based on “graph coloring”, run the following command:
Use the -r argument to specify the number of physical registers available for allocation. The default value is 8. Run the following command to run the MIPS program P.s:
Problem 1. (Register Allocation) Modify the file $j/j–/src/jminusminus/NGraphRegisterAllocator.java to implement register alloca- tion algorithm based on graph coloring.
Directions:
• Build liveness intervals.
• Use the liveness intervals to build an interference graph G.
• Apply “degree < r” heuristic to determine if G is r-colorable, where r is the number of physical registers available. • If G is r-colorable, allocate physical registers to the virtual registers — there’s no need to generate spill instructions. • If G is not r-colorable, allocate physical registers to the virtual registers, generating spill instructions as needed. à ~/workspace/j-- à ~/workspace/j-- $ bash ./bin/j-- -s graph P.java à ~/workspace/j-- $ spim -f P.s à ~/workspace/j-- $ $j/j--/bin/j-- -s graph -r 3 project6/Factorial.java $ spim -f Factorial.s SPIM Version 8.0 of January 8, 2010 Copyright 1990-2010, . Larus. All Rights Reserved. See the file README for a full copyright notice. Loaded: /usr/lib/spim/exceptions.s Before you submit your files, make sure: • Your code is adequately commented and follows good programming principles. • You use the template file report.txt for your report. • Your report meets the prescribed guidelines. Files to submit: 1. NGraphRegisterAllocator.java 2. report.txt

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