[LLVMdev] Metadata for Argument, BasicBlock

[Rotem, Nadav]

If we were to implement the #unroll pragma, we would want to add metadata to loop headers.  But, it's not a big deal since we can simply add this metadata to block terminators. 

-----Original Message-----
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Dan Gohman
Sent: Tuesday, May 08, 2012 00:58
To: Ralf Karrenberg
Cc: llvmdev at cs.uiuc.edu List
Subject: Re: [LLVMdev] Metadata for Argument, BasicBlock


On May 7, 2012, at 7:21 AM, Ralf Karrenberg <Chareos at gmx.de> wrote:

> Hi Duncan,
> 
> On 5/6/12 6:12 PM, Duncan Sands wrote:
>> Hi Ralf,
>> 
>>> Is there a clean way to attach metadata nodes to Arguments and/or 
>>> BasicBlocks?
>> 
>> not at the moment.  Feel free to work on adding this functionality!
> 
> I am looking into that now.
> I decided to temporarily go for the following syntax for BasicBlock 
> metadata (subject to discussion):
> 
> entry:
>     !property_1 !0, !property_2 !1
>   %x = fadd float %a, %b
> 
> It seems that I have to touch lots of files for this:
> BasicBlock.h/.cpp, Metadata.cpp, LLParser.cpp, AsmParser, AsmWriter, 
> BitcodeReader.cpp, BitcodeWriter.cpp so far.
> I basically went and duplicated code that handles metadata attached to 
> instructions.

What kind of things might basic block metadata be used for?

Dan

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