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From: bangerth@dealii.org
To: gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, java-prs@gcc.gnu.org,
	nobody@gcc.gnu.org, rsdio@metastatic.org
Subject: Re: java/8204: gcj -O2 to native reorders certain instructions improperly.
Date: Sat, 22 Mar 2003 18:09:00 -0000	[thread overview]
Message-ID: <20030322180952.12405.qmail@sources.redhat.com> (raw)

Synopsis: gcj -O2 to native reorders certain instructions improperly.

State-Changed-From-To: open->feedback
State-Changed-By: bangerth
State-Changed-When: Sat Mar 22 18:09:51 2003
State-Changed-Why:
    In your code, you are modifying i twice in the same line:
      (f(s.charAt(i++)) << 4) | (f(s.charAt(i++))))
    I don't know enough about Java, but in C/C++ this will invoke
    undefined behavior, since the standard doesn't prescribe
    which of the two function calls happen first, and with
    which value of i. Is this different in Java, i.e. does
    the Java standard give guarantees as to the order in which
    the sub-statements are executed?
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8204


             reply	other threads:[~2003-03-22 18:09 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-03-22 18:09 bangerth [this message]
2003-03-23  0:06 Casey Marshall
2003-03-24 15:23 bangerth
2003-03-25 22:46 Tom Tromey

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