[PATCH] D15676: [attrs] Extract the pure inference of function attributes into a standalone pass.

[Mehdi Amini via llvm-commits]

Sent from my iPhone

> On Dec 21, 2015, at 12:07 AM, James Molloy <james at jamesmolloy.co.uk> wrote:
> 
> Hi Mehdi,
> 
> > For strlen: you’re right that it is not correct in the absolute, but for what we use the information I’m not sure it matters. We’re interested in the fact that it won’t call back in the user code in any way, so that we can infer the norecurse on the callers.
> 
> I understand where you're coming from, but I think second-guessing how an attribute may be used is a dangerous route to go down. "norecurse" could be used for something else in the future, so unless we have a good reason it would be good not to make assumptions.
> 

Agree, but if we go on the "safe way" now it means we should either redefine the norecurse attribute (like the almostreadnone for example) or have another one.

Mehdi



> James
> 
>> On Mon, 21 Dec 2015 at 10:06 James Molloy via llvm-commits <llvm-commits at lists.llvm.org> wrote:
>> jmolloy accepted this revision.
>> jmolloy added a comment.
>> This revision is now accepted and ready to land.
>> 
>> Hi Chandler,
>> 
>> Thanks for taking the time to do this.
>> 
>> I agree with Philip - while I like that you've added extra norecurse attributes, I don't like that it's smuggled in as part of this patch. I'd highly prefer this patch to be NFC and then a simple update patch adding the norecurse attributes.
>> 
>> Apart from that and the specific comment below, it LGTM.
>> 
>> Cheers,
>> 
>> James
>> 
>> 
>> ================
>> Comment at: include/llvm/Transforms/IPO/InferFunctionAttrs.h:25
>> @@ +24,3 @@
>> +/// A pass which infers function attributes from the names and signatures of
>> +/// function declarations in a module..
>> +class InferFunctionAttrsPass {
>> ----------------
>> Double period.
>> 
>> ================
>> Comment at: include/llvm/Transforms/IPO/InferFunctionAttrs.h:26
>> @@ +25,3 @@
>> +/// function declarations in a module..
>> +class InferFunctionAttrsPass {
>> +public:
>> ----------------
>> Unrelated: Damn, new style passes look so much nicer!
>> 
>> 
>> http://reviews.llvm.org/D15676
>> 
>> 
>> 
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