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- /*-
- * Copyright (c) 1980 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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- * SUCH DAMAGE.
- *
- * @(#)READ_ME 5.2 (Berkeley) 4/16/91
- */
-
- This directory contains the source code for the Version 7 VAX
- interpreter for Pascal. Following standard convensions, the makefile
- contains four commands:
-
- px - compile px
-
- install - compile and install px in /usr/ucb
-
- clean - clean out directory
-
- print - print out a listing of px
-
-
-
- Bugs and Limitations:
-
- Runtime error messages could give far more information than they
- currently do. (eg the actual value of a subscript which is out
- of range)
-
- It should be possible to resume execution following many of
- the runtime errors. (eg fixed overflow, interrupt, etc)
-
-
- Comparison of Pascal with C compiler
-
- In an attempt to compare compiled versus interpreted execution speeds
- the 'Tower of Hanoi' benchmark (see hanoi.p, hanoi.c) was run with
- the following results:
-
- Data:
- number of disks: 16
- number of moves required: 65535
-
- Compiler, Flags Compile Compile Run Run
- Time Factor Time Factor
- Pi, full tests 0.4u+0.4s 1.0 42.7u 1.0
- Pi, no tests 0.3u+0.3s 0.7 35.2u 1.2
- Pc, unoptimized 3.8u+2.4s 7.7 5.3u 8.1
- Pc, optimized 4.4u+2.3s 8.4 4.6u 9.3
- C, unoptimized 1.7u+1.8s 4.4 2.8u 15.3
- C, optimized 2.0u+2.0s 5.0 2.5u 17.1
-
- Note: The times for Pc and C were obtained by running larger
- problems and scaling the run times down appropriately.
-