llvm dev - Apr 2015 - [LLVMdev] RFC: Metadata attachments to function definitions

> On 2015-Apr-15, at 10:03, Reid Kleckner <rnk at google.com> wrote:
> 
> On Wed, Apr 15, 2015 at 9:46 AM, Duncan P. N. Exon Smith <dexonsmith at
apple.com> wrote:
> I'm happy to defer to conventional wisdom here if anyone wants me to
> (and TBH, I've only been looking at profiles that include debug info,
> so maybe `sizeof(Function)` matters with -g0).
> 
> I think JITs are a more compelling use case for keeping Function small.
They shouldn't have to pay too much for a feature they don't use.
Ah, of course.  I know nothing of JITs.

I'll squeeze it into 8B then.  Maybe I'll even start with the same setup
as `Instruction`, with a side map in the `LLVMContext`.  No reason to
diverge until/unless there's a real problem with it.

> On 2015-Apr-15, at 10:08, Duncan P. N. Exon Smith <dexonsmith at
apple.com> wrote:
> 
> 
>> On 2015-Apr-15, at 10:03, Reid Kleckner <rnk at google.com>
wrote:
>> 
>> On Wed, Apr 15, 2015 at 9:46 AM, Duncan P. N. Exon Smith <dexonsmith
at apple.com> wrote:
>> I'm happy to defer to conventional wisdom here if anyone wants me
to
>> (and TBH, I've only been looking at profiles that include debug
info,
>> so maybe `sizeof(Function)` matters with -g0).
>> 
>> I think JITs are a more compelling use case for keeping Function small.
They shouldn't have to pay too much for a feature they don't use.
> 
> Ah, of course.  I know nothing of JITs.
> 
> I'll squeeze it into 8B then.  Maybe I'll even start with the same
setup
> as `Instruction`, with a side map in the `LLVMContext`.  No reason to
> diverge until/unless there's a real problem with it.
Filed PR23340 to do the IR infrastructure.  Hoping to get this done today.

For now, I'll just use a side map in `LLVMContext`.  We can specialize for
`!dbg` if/when some sort of profile tells us we should.

On Fri, Apr 24, 2015 at 4:19 PM, Duncan P. N. Exon Smith <
dexonsmith at apple.com> wrote:
>
> Filed PR23340 to do the IR infrastructure.  Hoping to get this done today.
>
> For now, I'll just use a side map in `LLVMContext`.  We can specialize
for
> `!dbg` if/when some sort of profile tells us we should.
>
>
Fantastic!  Thanks.


Diego.
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