Re: volatile required?

Article View: comp.std.c

Article #634

#634

From: Anthony Scian
Date: Fri, 29 Sep 1989 14:30

21 lines
1165 bytes

In article <712@Aragorn.dde.dk> ct@dde.dk (Claus Tondering) writes:
>Consider the following program:
>
>	main()
>	{
>	  int p=3, *q=&p;
>
>	  *q=4;
>	  printf("%d\n",p);
>	}
>
>Is it acceptable that this program prints 3 instead of 4? 
NO. This is a convenient type of oversight that allows so called
"optimizing compilers" like Turbo C and Microsoft C to squeeze
out extra performance from benchmarks. Too bad if production code
doesn't run with the optimizer turned on. True optimizing
compilers (WATCOM C,GNU CC) don't resort to "tricks" like this.
--
Anthony
//// Anthony Scian afscian@violet.uwaterloo.ca afscian@violet.waterloo.edu ////
"I can't believe the news today, I can't close my eyes and make it go away" -U2

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References: <712@Aragorn.dde.dk>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!watmath!watdragon!violet!afscian
From: afscian@violet.waterloo.edu (Anthony Scian)
Newsgroups: comp.std.c
Subject: Re: volatile required?
Message-ID: <16785@watdragon.waterloo.edu>
Date: 29 Sep 89 14:30:35 GMT
References: <712@Aragorn.dde.dk>
Sender: daemon@watdragon.waterloo.edu
Reply-To: afscian@violet.waterloo.edu (Anthony Scian)
Organization: U. of Waterloo, Ontario
Lines: 21

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