[Bug tree-optimization/24028] CCP is broken

[dnovillo at redhat dot com]

------- Additional Comments From dnovillo at redhat dot com  2005-09-23 12:30 -------
Subject: Re:  CCP is broken

On September 23, 2005 01:29, kazu at gcc dot gnu dot org wrote:
> ------- Additional Comments From kazu at gcc dot gnu dot org 
> 2005-09-23 05:29 ------- The reason why CCP thinks that the result of
> the PHI node is varying is because ccp_initialize thinks that a PHI
> node is varying if at least one of PHI argument is varying.
>
This is very related to 23588. The heuristics to speed up propagation 
are crippling the propagator.  likely_value and ccp_initialize are the 
main functions to start fixing.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24028