[LLVMdev] CostModelAnalysis for 3.0 release

[ryan]

On Thu, Feb 7, 2013 at 3:23 PM, Nadav Rotem <nrotem at apple.com> wrote:

>
> On Feb 7, 2013, at 3:17 PM, ryan <stdstack at gmail.com> wrote:
>
> > Thanks a lot for the reply, Nadav!
> > I see that using the cost model in target-independent analysis is not
> good. But I really like the idea of having instruction
> > cost estimation available. Also the reason I can't directly move to 3.2
> code base is that it fails to compile(produce bc files) big
> > project like MySQL, where 3.0 has no problem.
> >
>
> Is this a known problem ? Can you please file a bugzilla ? LLVM should be
> able to compiler MySQL …
>
> OK. I didn't find much on the internet related to the
clang compilation error. Just filed the bug report
http://llvm.org/bugs/show_bug.cgi?id=15206

>
> > Right now, I'm trying to hard code a particular target, and copy part of
> the TargetTransformInfo and X86TargetTransformInfo
> > to a simple LLVM 3.0 project to try out. So far I'm stuck in
> instantiating X86TargetMachine and wondering whether it can be
> > created from instances of TargetMachine or TargetData.
> >
>
> Look at tools/opt/opt.cpp  or tools/llc/llc.cpp. They both initialize the
> target machine using the target data.
>
> Thanks a lot for the pointer. I'll take a look!


Best regards,
Ryan
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