Aucbvax.6862
fa.info-vax
utzoo!decvax!ucbvax!info-vax
Thu Apr 22 10:58:50 1982
C compiler code generation
>From KASHTAN@SRI-AI Thu Apr 22 10:49:50 1982
Thought you might be interested in what the DEC "C" compiler did on those
examples.

       "C" program using double floats:
               Detected that a constant was being added and generated
               a series of "  addf2    #const,register" instructions.

       "C" program using ints:
               Detected that the constant was 1 and just generated a
               series of " incl  register" instructions
               It also detected a constant number of iterations in the
               loop and did loop control with an "  aobleq" instruction.

       "PASCAL" program:
               The DEC Pascal compiler did poorly, generating things of
               the form:
                       "  addf3   register,variable,register2"
                       "  movf    register2,variable"


       Win a few, lose a few.
David
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