[PATCH] Add target analysis passes to the codegen pipeline for MCJIT

[Kaylor, Andrew]

Is it possible to turn those passes off based on optimization level?

My concern is that a lot of MCJIT users are much more concerned about compilation time than they are about optimization.  At some point MCJIT should probably provide a finer grained control over what does and does not happen.  Right now I think setting the optimization level is the closest we come to that.

-Andy


From: Juergen Ributzka [mailto:juergen at apple.com]
Sent: Tuesday, January 21, 2014 6:53 PM
To: Kaylor, Andrew
Cc: LLVM Commits
Subject: Re: [PATCH] Add target analysis passes to the codegen pipeline for MCJIT

The only passes targets placed so far into "addAnalysisPasses" are the target specific TargetTransformInfo passes. They only provide more accurate answers to target hooks and cost models. Of course this might lead to different code paths taken by optimization passes that depend on it, but I don't know what the actual overhead of that is.

On Jan 21, 2014, at 4:47 PM, Kaylor, Andrew <andrew.kaylor at intel.com<mailto:andrew.kaylor at intel.com>> wrote:


What's the impact of these passes on compile time?

From: llvm-commits-bounces at cs.uiuc.edu<mailto:llvm-commits-bounces at cs.uiuc.edu> [mailto:llvm-commits-bounces at cs.uiuc.edu] On Behalf Of Juergen Ributzka
Sent: Tuesday, January 21, 2014 10:30 AM
To: LLVM Commits
Subject: [PATCH] Add target analysis passes to the codegen pipeline for MCJIT

Hi @ll,

for some reason we forgot to add the target specific analysis passes to the codgen pipeline of MCJIT. All other tools (llc, etc) use these passes and so should MCJIT.

This patch adds the missing passes to the codegen pipeline. It also exposes the AddAnalysisPasses method through the C API, because the optimizer passes could also benefit from it.

Cheers,
Juergen



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