[llvm-dev] Look up table in function section

[Friedman, Eli via llvm-dev]

On 5/4/2017 10:36 AM, Sumanth Gundapaneni via llvm-dev wrote:
>
> I have legit requirement to keep the switch generated lookup table in 
> function section.
>
> The lookup table is being generated in SimplifyCFG pass and is treated 
> as a global.
>
> Is there a good way to mark these lookup tables and recognize them 
> later to keep them in function sections.
>

There are target hooks to suppress the generation of lookup tables, if 
you need that.  See shouldBuildLookupTables and 
shouldBuildLookupTablesForConstant in TargetTransformInfo.  If you need 
something beyond that, you'll have to modify the transform. You can set 
a section on a global, but it sounds like that isn't what you want?

In terms of putting IR globals into a function, the only precedent I can 
think of is the arm-constant-promote transform.

-Eli

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20170504/0d0d76cd/attachment.html>