PRE (sometimes) confuses ivopts/scev?

[Daniel Berlin]

On Wed, 26 Jan 2005, Andrew Pinski wrote:

>
> On Jan 26, 2005, at 10:52 AM, Daniel Berlin wrote:
>
>> However, if i attempt to fix this by adding a DCE pass after PRE, tree 
>> if-convert screws up the cfg completely, and fails its tests anyway 
>> (verify_ssa failure)
>
> yes there was a patch for this.

There were multiple problems with ifconv here, and i only remembre one 
patch.
See PR 18815