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From: reichelt@igpm.rwth-aachen.de
To: falk@efalk.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
	nobody@gcc.gnu.org
Subject: Re: optimization/7325: Test "if ( a && b )" where a, b are 1-bit fields, could be better
Date: Tue, 14 Jan 2003 14:46:00 -0000	[thread overview]
Message-ID: <20030114144655.6096.qmail@sources.redhat.com> (raw)

Synopsis: Test "if ( a && b )" where a, b are 1-bit fields, could be better

State-Changed-From-To: analyzed->closed
State-Changed-By: reichelt
State-Changed-When: Tue Jan 14 06:46:51 2003
State-Changed-Why:
    There seems to be not much room for improvement, given the reply below:
    
    > Yeah :( I had this exact same conversation with the last guy the
    > bug was assigned to.  I wish I'd kept my notes from then.
    > 
    > Let's see, we were trying to determine if the test
    > 
    >        (*foo & 3) == 3
    > 
    > could be optimized.  At the time, I think we concluded that translating to
    > 
    >        (~*foo & 3) == 0
    > 
    > which was sometimes, but usually not, an improvement.
    > 
    >        -ed falk

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7325


             reply	other threads:[~2003-01-14 14:46 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-01-14 14:46 reichelt [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-01-08 16:16 Volker Reichelt
2003-01-08  1:51 bangerth

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