[Bug tree-optimization/18694] [4.0 regression] loop miscompilation at -O1 (-ftree-ch)
kazu at cs dot umass dot edu
gcc-bugzilla@gcc.gnu.org
Fri Dec 10 21:31:00 GMT 2004
------- Additional Comments From kazu at cs dot umass dot edu 2004-12-10 21:31 -------
Subject: Re: [4.0 regression] loop
miscompilation at -O1 (-ftree-ch)
Hi Jeff,
> Err, no. You're totally warping how the the equivalency code is meant
> to work. It's a symmetric relationship and it's your patch that is
> making it asymmetric.
I thought SSA_NAME_VALUE gets me a gimple min invariant or the
earliest SSA_NAME that has the same value.
> Don't bother. The patch is wrong.
Can you come up with a hypothetical scenario?
Kazu Hirata
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18694
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