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Re: [avr-gcc-list] What's wrong with this preprocessor statement

From: J Wunsch
Subject: Re: [avr-gcc-list] What's wrong with this preprocessor statement
Date: Tue, 27 Feb 2001 11:35:57 +0100 (MET)

Denis Chertykov <address@hidden> wrote:

> Today it's not a true.
> Now GCC can optimize out such loops.

Out of curiosity: when does gcc optimize them out?  All versions of
gcc i tried (AVR, FreeBSD/i386, Linux/i386, Solaris/Sparc,
HP-UX/PA-RISC, all of them were 2.95.2 versions) don't optimize it
away in the following file, not even with -O3 (which implies
-fstrength-reduce, which is documented to perform the loop variable

        int i;

        for (i = 0; i < 10000; i++) ;

J"org Wunsch                                           Unix support engineer
address@hidden         http://www.interface-systems.de/~j

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