llvm dev - Jul 2016 - Optimizations using profile information

Hi,
Which optimization passes use profile information?
http://llvm.org/docs/Passes.html seems to suggest only block placement uses it,
is that correct?

Emma.
 		 	   		  
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> On Jul 15, 2016, at 3:14 AM, Emma Espinosa via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> Hi,
> Which optimization passes use profile information?
http://llvm.org/docs/Passes.html <http://llvm.org/docs/Passes.html> seems
to suggest only block placement uses it, is that correct?

Using grep in the codebase to look for BlockFrequencyInfo and
BranchProbabilityInfo yield a bunch of middle passes like JumpThreading,
LoopUnswitch, LoopVectorize, InductiveRangeCheckElimination. There are more in
the CodeGen. And I know that we also try to use it to drive ThinLTO importing.

— 
Mehdi

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2016-07-15 21:05 GMT-07:00 Mehdi Amini via llvm-dev <llvm-dev at
lists.llvm.org
>:
>
> On Jul 15, 2016, at 3:14 AM, Emma Espinosa via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Hi,
> Which optimization passes use profile information?
> http://llvm.org/docs/Passes.html seems to suggest only block placement
> uses it, is that correct?
>
>
>
> Using grep in the codebase to look for BlockFrequencyInfo
> and BranchProbabilityInfo yield a bunch of middle passes like
> JumpThreading, LoopUnswitch, LoopVectorize, InductiveRangeCheckElimination.
> There are more in the CodeGen. And I know that we also try to use it to
> drive ThinLTO importing.
>
> ThinLTO doesn't care much about profile date right now, but it should
in 2
months.

Piotr

> —
> Mehdi
>
>
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