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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