john@x.UUCP (John Woods) (06/05/85)
I ran the Knight's Tour program on CRDS' current 68000 computer, and on our prototype 68020. I also compared our old C compiler against our new C compiler from Green Hills. For comparison, I also ran it on a VAX 750 and a PDP 11/70 (my pet system at MIT). Also, for fun, I ran both 5x5 and 6x6 boards. The results: 12.5Mc [1] 12.5Mc [2] 12.5Mc Cast of Compilers Board 68000 VAX750 68000 11/70 68020 WS C Whitesmiths Size WS C pcc GH C V7 C GH C GH C GreenHills ----- ----- ----- ----- ----- pcc pcc VAX 5 x 5 5.1 3.5 3.5 2.3 1.7 V7 C God's own C 6 x 6 147 109 61 67 29.5 7 x 7 2859* * Ran on "frog", our uucp machine, in [1] mit-eddie background, just for [2] mitccc amusement. All these machines were lightly loaded during the tests, the times reported are user-times (in seconds). The 680?0 C compilers both use 32-bit "int"s. One advantage the Greenhills compiler has over the old one is that it tries to make clever use of spare registers lying around. I found the difference quite instructive. -- John Woods, Charles River Data Systems, Framingham MA, (617) 626-1101 ...!decvax!frog!john, ...!mit-eddie!jfw, jfw%mit-ccc@MIT-XX.ARPA "MU" said the Sacred Chao...