[llvm-commits] [llvm] r167324 - in /llvm/trunk: include/llvm/Analysis/Passes.h include/llvm/InitializePasses.h include/llvm/LinkAllPasses.h lib/Analysis/Analysis.cpp lib/Analysis/CMakeLists.txt lib/Analysis/CostModel.cpp test/Analysis/CostModel/

[Chandler Carruth]

FWIW, I've hacked on users of code metrics a lot, and when the cost
model starts to be more fleshed out, I'll be happy to chat about use
cases. Until then, I suspect you have plenty of use cases to motivate
it, and it's better to stay focused on that.

On Fri, Nov 2, 2012 at 4:39 PM, Nadav Rotem <nrotem at apple.com> wrote:
> Code metrics runs on a function or a basic block and collects statics such as the number of dynamic allocas, or the number of vector instructions.  The Cost Model class attempts to estimate the execution cost. The only overlap that I see is that CodeMetrics has API for checking if a given instruction is free.
>
> On Nov 2, 2012, at 4:35 PM, Eli Friedman <eli.friedman at gmail.com> wrote:
>
>> On Fri, Nov 2, 2012 at 2:48 PM, Nadav Rotem <nrotem at apple.com> wrote:
>>> Author: nadav
>>> Date: Fri Nov  2 16:48:17 2012
>>> New Revision: 167324
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=167324&view=rev
>>> Log:
>>> Add a cost model analysis that allows us to estimate the cost of IR-level instructions.
>>>
>>> Added:
>>>    llvm/trunk/lib/Analysis/CostModel.cpp
>>>    llvm/trunk/test/Analysis/CostModel/
>>>    llvm/trunk/test/Analysis/CostModel/X86/
>>>    llvm/trunk/test/Analysis/CostModel/X86/lit.local.cfg
>>>    llvm/trunk/test/Analysis/CostModel/X86/tiny.ll
>>>    llvm/trunk/test/Analysis/CostModel/X86/vectorized-loop.ll
>>>    llvm/trunk/test/Analysis/CostModel/lit.local.cfg
>>>    llvm/trunk/test/Analysis/CostModel/no_info.ll
>>> Modified:
>>>    llvm/trunk/include/llvm/Analysis/Passes.h
>>>    llvm/trunk/include/llvm/InitializePasses.h
>>>    llvm/trunk/include/llvm/LinkAllPasses.h
>>>    llvm/trunk/lib/Analysis/Analysis.cpp
>>>    llvm/trunk/lib/Analysis/CMakeLists.txt
>>
>> How is this new pass related to the utilities in llvm/Analysis/CodeMetrics.h ?
>>
>> -Eli
>
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits