1 Theory
1.1 12%
Create control flow graphs for the following program fragments:
1. for ( a ; b ; c ) d ; e ;
2. a ; while ( b ) { d ; c ; } e ;
3. a ; do { d ; c ; } while ( b ); e ;
1.2 18%
Consider the following program fragment:
1. a=1
2. b=2
3. c=3
4. d=a+x
5. e=b+c
6. f=e
7. g=f
8. g=d+y
9. a=b+c
Identify the lines impacted by the optimizations
1. Copy propagation
2. Common subexpression elimination
3. Constant propagation
and rewrite them appropriately (start with the original program for each case).
2 Programming (70%)
Complete the VSL compiler (from your own code, or starting from ps6 skeleton.tgz), by implementing the following constructs in generator.c:
1. Local variables (20%)
2. Function calls (20%)
3. Conditionals (IF and relations) (15%)
4. While loops (10%)
5. Continue (null statement) (5%)
