doit test1 > test1_doit.txt
-----------------------------------
-- a comment
x := 3;
y := x - 45 * x;
writeln (" x =", x, " y =", y);

-------------------------------------
in     simple.c

Token  : Id
Token  : Assignop
Token  : Iconst
Token  : Termsym
Token  : Id
Token  : Assignop
Token  : Id
Token  : Minussym
Token  : Iconst
Token  : Mpysym
Token  : Id
Token  : Termsym
Token  : Writeln
Token  : Lparen
Token  : Strconst
Token  : Commasym
Token  : Id
Token  : Commasym
Token  : Strconst
Token  : Commasym
Token  : Id
Token  : Rparen
Token  : Termsym
 
Intermediate Representation - the Abstract Syntax Tree
   Statements
      Assign
         x
            gets
         Immediate Value 3
      Assign
         y
            gets
            x
         subtract
               Immediate Value 45
            multiply
               x
      Writeln
         parameters
             x =
            x
             y =
            y


From codegen.c - DisplayRegs() marks used registers

Register: 0 1 2 3 4 5 6 7 8 9 
          - - - - - - - - - - 
Used = x:                 x x

COMPILATION COMPLETE
out    simple.c

------------------------------------------------------
Listing File:   test2.list
-- a comment
x := 3;
y := x - 45 * x;
writeln (" x =", x, " y =", y);
-------------------------------------------------------

SPIM Version 6.2 of January 11, 1999
Copyright 1990-1998 by James R. Larus (larus@cs.wisc.edu).
All Rights Reserved.
See the file README for a full copyright notice.
Loaded: /opt/spim/bin/trap.handler
 x =3 y =-132