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Re: c/7527: gcc 2.95.3 and gcc 3.0.4 generate incorrect code
- From: Stian <stian at knowledge-network dot no>
- To: nobody at gcc dot gnu dot org
- Cc: gcc-prs at gcc dot gnu dot org,
- Date: 8 Aug 2002 10:16:03 -0000
- Subject: Re: c/7527: gcc 2.95.3 and gcc 3.0.4 generate incorrect code
- Reply-to: Stian <stian at knowledge-network dot no>
The following reply was made to PR c/7527; it has been noted by GNATS.
From: Stian <stian@knowledge-network.no>
To: gcc-gnats@gcc.gnu.org
Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org,
tomdean@asus.tddhome
Subject: Re: c/7527: gcc 2.95.3 and gcc 3.0.4 generate incorrect code
Date: 08 Aug 2002 12:08:55 +0200
The second conditional makes more sense if you use () at the right places
if(!(_io_ports[0x39]&0x80))
If you don't add them, your statement is the same as
if((!_io_ports[0x39])&0x80)
That always come out false, then ! makes the result of the io-read either 0 or 1.
Stian