[google] Patch to support calling multi-versioned functions via new GCC builtin. (issue4440078)

[Diego Novillo]

On Fri, May 6, 2011 at 04:55, Richard Guenther
<richard.guenther@gmail.com> wrote:
> On Thu, May 5, 2011 at 7:02 PM, Xinliang David Li <davidxl@google.com> wrote:
>>
>> 2) Support of CallInfo for each callsite. This is an annotation, but
>> more standardized. The callinfo can be used to record information such
>> as call attributes, call side effects, mod-ref information etc ---
>> current gimple_call_flags can be folded into this Info structure.
>
> I don't like generic annotation facilities.  What should passes to with
> annotated stmts that are a) transformed, b) removed?  See RTL notes
> and all the interesting issues they cause.

Likewise.  We kind of tried having them in the early days of gimple
and tree-ssa, but quickly removed them.  Anything that is not a
first-class IL member, makes life difficult.  We have some examples in
PHI nodes and EH regions.  They're a bit to the side, and require
extra code to manage.


Diego.