[LLVMdev] LLVM and loop optimizations

Chris Lattner sabre at nondot.org
Wed Jun 11 23:10:32 PDT 2008

On Jun 11, 2008, at 3:59 AM, Gaster, Benedict wrote:
> Hello,
> We are currently evaluating LLVM as a compiler technology against  
> Open64 and have a few questions regarding its currently status with  
> respect to optimizations in particular.

Hi Benedict,

As others have said, LLVM does not have much in the way of high-level  
dependence-analysis based loop transformations.  There are several  
groups that are interested in this, so I expect this to start  
improving over the next months.

Pragmatically speaking, the right choice for you probably depends on  
your goals.  If you need to get something running as soon as possible  
and need these high level loop xforms, Open64 is probably the way to  
go.  If you are interested in the long term and interested in  
contributing to make this happen, I strongly believe LLVM is a better  
choice than Open64.  We would obviously welcome any input and  
contributions from AMD of course.

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