combiner fix, PR45966

[H.J. Lu]

On Sun, Oct 31, 2010 at 8:17 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Mon, Oct 11, 2010 at 12:45 PM, Bernd Schmidt <bernds@codesourcery.com> wrote:
>> The combine-4 patch caused PR45966.  We have a 4->2 combination, and i0
>> feeds i1 which feeds i2.  When substituting, we only check i0_feeds_i2
>> and i1_feeds_i2; we also need to check the i0_feeds_i1/i1_feeds_i2 chain
>> and substitute accordingly.
>>
>> Bootstrapped and regression tested on i686-linux; ok?
>>
>
> This caused:
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46248
>

It also caused:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46212


-- 
H.J.