Increment isn't done before assigment in unoptimized version

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1 total messages Started by John Carlson Wed, 02 Sep 1992 09:01

#1042

Author: John Carlson
Date: Wed, 02 Sep 1992 09:01

31 lines
988 bytes

Machine: Sparcstation 2
OS: Sun OS 4.1.1
Compiler: gcc-2.2.2


The follow program gives difference result when compiled with
and without the -O option to gcc.

#include <stdio.h>
main ()
{
	int i = 0;
	i = i++;
	printf("should be 1->%d\n", i);
}


The unoptimized version prints:

should be 1->0

The optimized version prints:

should be 1->1

Guess the moral of the story is to use the optimized version.
Either that or I was too tired when programming.
(Yeay! The program works now!)

John Carlson
carlson@yottzumm.tis.llnl.gov

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