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ASC Programming Guide: Software, Data Types, Control Structures

Learn ASC programming basics such as software installation, data types, input/output, control structures, and looping. Study performance monitoring and compiler/emulator usage. Detailed examples and step-by-step instructions are provided.

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ASC Programming Guide: Software, Data Types, Control Structures

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  1. ASC Programming Michael C. Scherger Department of Computer Science Kent State University September 27, 2002

  2. Contents • Software Location and Installation • Basic Program Structure • Data Types and Variables • Associations and Setscope • Input / Output • Control Structures • Looping • Performance Monitor

  3. Compiler and Emulator DOS/Windows, UNIX (Linux) WaveTracer Connection Machine http://zserver.cs.kent.edu/PACL/downloads.htm Use any text editor. Careful moving files between DOS and UNIX! Software Anyprog.asc -e -wt -cm ASC Compiler Anyprog.iob -e -wt -cm ASC Emulator Standard I/O File I/O

  4. Software • Example: • To compile your program… • % asc1.exe –e shapes.asc • To execute your program… • % asc2.exe –e shapes.iob • % asc2.exe –e shapes.iob < shapes.dat • % asc2.exe –e shapes.iob < shapes.dat > shapes.out

  5. Basic Program Structure • Main program_name • Constants; • Varaibles; • Associations; • Body; • End;

  6. Basic Program Structure • Example: • Consider an ASC Program that computes the area of various simple shapes (circle, rectangle, triangle). • Here is an example shapes.asc • Here is the data shapes.dat • Here is the shapes.out

  7. Data Types and Variables • ASC has eight data types… • int, real, hex, oct, bin, card, char, logical, index. • Variables can either be scalar or parallel. • Scalar variables are in the IS. Parallel variables are in the cells. • Parallel variables have the suffix “[$]” at the end of the identifier. • Can specify the length (in bits) of parallel variables. Default length works fine for most programs.

  8. int scalar a, b, c; int parallel p[$], q[$], r[$], pp[$,4]; index parallel xx[$], yy[$]; a+b scalar a+p[$] parallel a+p[xx] scalar pp[xx,b]*3+q[$] parallel p[xx]+pp[yy,b] scalar q[$]+r[$] parallel a+pp[xx,b]*3 scalar More Examples on page 9-10 Data Types and Variables

  9. Associations and Setscope • There are no “structs” or “classes” in ASC. • Create an association between parallel variables and a parallel logical variables. • Example on page 8. • Setscope • Selects or “marks” a set of active cells. • Example on page 15

  10. Input / Output • READ • Page 12-13. • Must have an ASSOCIATE statement. • Input file must have blank line at end of data set. • Read from “standard input” or from data file re-directed from command line.

  11. Input / Output • PRINT • Page 13 • Must have an ASSOCIATE statement. • Does not output user specified strings. • I.e. User text messages. • Only outputs the values of parallel variables.

  12. Input / Output • MSG • Page 13-14 • Used to display user text messages. • Used to display values of scalar variables. • Used to display a dump of the parallel variables.

  13. Control Structures • IF-THEN-ELSE • Scalar version similar to other sequential programming languages. • Either executes the body of the IF, OR executes the body of the ELSE. • Parallel version is more “sequence-like”. • Executes body of the IF followed by body of ELSE. • Masking operation.

  14. Control Structures • Relational operators on page 40. • Example on page 16. • IF-NOT-ANY on page 16-17. • ANY on page 17-19.

  15. Looping • Sequential looping • Loop-Until • Example on page 20. • Two types of parallel looping constructs: • Parallel For-Loop • Conditional is evaluated only once. • Example on page 21. • Parallel While-Loop • Conditional is evaluated every iteration. • Example on page 21-22.

  16. Performance Monitor • Keeps track of number of scalar and parallel operations. • PERFORM = 1; • PERFORM = 0; • MSG PA_PERFORM; • MSG SC_PERFORM;

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