1Copyright (c) 1979 Regents of the University of California 2 3sccsid = "@(#)READ_ME 1.1 01/07/81" 4 5 This directory contains the source code for the Version 7 VAX 6interpreter for Pascal. Following standard convensions, the makefile 7contains four commands: 8 9 px - compile px 10 11 install - compile and install px in /usr/ucb 12 13 clean - clean out directory 14 15 print - print out a listing of px 16 17 18 19Bugs and Limitations: 20 21 Runtime error messages could give far more information than they 22currently do. (eg the actual value of a subscript which is out 23of range) 24 25 It should be possible to resume execution following many of 26the runtime errors. (eg fixed overflow, interrupt, etc) 27 28 29Comparison of Pascal with C compiler 30 31In an attempt to compare compiled versus interpreted execution speeds 32the 'Tower of Hanoi' benchmark (see hanoi.p, hanoi.c) was run with 33the following results: 34 35Data: 36 number of disks: 16 37 number of moves required: 65535 38 39Compiler, Flags Compile Compile Run Run 40 Time Factor Time Factor 41Pi, full tests 0.4u+0.4s 1.0 42.7u 1.0 42Pi, no tests 0.3u+0.3s 0.7 35.2u 1.2 43Pc, unoptimized 3.8u+2.4s 7.7 5.3u 8.1 44Pc, optimized 4.4u+2.3s 8.4 4.6u 9.3 45C, unoptimized 1.7u+1.8s 4.4 2.8u 15.3 46C, optimized 2.0u+2.0s 5.0 2.5u 17.1 47 48Note: The times for Pc and C were obtained by running larger 49problems and scaling the run times down appropriately. 50