[LLVMdev] CostModelAnalysis for 3.0 release

[Nadav Rotem]

Hi Ryan, 

I think that it would be difficult to back port the CostModel back to LLVM3.0 because it uses the new TargetTransformInfo analysis.  I also wanted to mention that only _lowering_ passes (target-specific optimization passes) may use TTI and the cost model. Higher-level canonicalization passes should not use it. 

Thanks,
Nadav

On Feb 6, 2013, at 1:26 AM, ryan <stdstack at gmail.com> wrote:

> Hi All,
> I wanted to do some basic cost estimation of Instruction/BB. There're CostModelAnalysis and CodeMetrics available in 3.1 and 3.2 releases.
> I've been using 3.0 for a while. I'm wondering whether similar analysis can be done in the old 3.0 release, e.g. back porting the implementation. 
> 
> Thank you!
> 
> Best,
> Ryan
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