[llvm-commits] [llvm] r52933 - /llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp

[Chris Lattner]

On Jul 1, 2008, at 9:08 AM, Evan Cheng wrote:

> Surprisingly turning off DAG combiner will slow down compilation. The
> dag combiner time is out weighted by the time spent processing all the
> crap that's not optimized away. It's possible we can turn off the
> second run of dag combiner only. I'll find out if that's case.

Are there a few common xforms that dag combiner does that are  
important?  If so, maybe those should be added to ::getNode()?

-Chris

>
>
> Evan
>
> On Jul 1, 2008, at 1:09 AM, Duncan Sands wrote:
>
>> Hi Evan,
>>
>>> Don't run stack slot coloring if -fast.
>>
>> I noticed that the DAG combiner runs even if -fast.
>> Is that needed for correctness or is it an oversight?
>>
>> Ciao,
>>
>> Duncan.
>
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