From: Andrew Makhorin <mao@gnu.org>
To: gcc-help@gcc.gnu.org
Subject: how to disable optimization for particular assignment statements?
Date: Thu, 21 Nov 2013 08:22:00 -0000 [thread overview]
Message-ID: <1385018681.2093.3.camel@corvax> (raw)
Hello,
I have a C code like this:
int foo(void)
{ int phase;
. . .
phase = 1;
phase = 2;
phase = 3;
. . .
}
In case of -O0 gcc generates machine instructions for every
assignment 'phase = ...'. But in case of -O2 gcc does not generate
instructions for some assigments. Of course, this is correct. However,
is there any way to tell gcc that 'phase' object is inspected by another
thread, so it should not remove such statements?
Thank you,
Andrew Makhorin
next reply other threads:[~2013-11-21 7:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-21 8:22 Andrew Makhorin [this message]
2013-11-21 8:55 ` Marc Glisse
2013-11-21 9:20 ` Marc Glisse
2013-11-23 2:48 ` Ian Lance Taylor
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