[llvm-dev] Return on nocapture pointer

[Piotr Padlewski via llvm-dev]

Thanks guys.
Do you it make sense to extend the definition in LangRef? If so I will be
happy to upload a patch.

Piotr

2017-04-28 17:58 GMT+02:00 Hal Finkel <hfinkel at anl.gov>:

>
>
> On 04/28/2017 10:22 AM, Piotr Padlewski via llvm-dev wrote:
>
> Hi,
> I have a question about semantics of nocapture attribute:
> "This indicates that the callee does not make any copies of the pointer
> that outlive the callee itself. "
> Is returing a pointer considered outliving callee? For example is this
> code valid:
>
>
> Yes, it includes returning the pointer. The code below is invalid. The
> return value outlives the callee itself.
>
>
> define i8* @foo(i8* nocapture %p)
>   ret i8* %p
> }
>
> The documentation also mention that " This is not a valid attribute for
> return values.", but I interpret that it is is about this case:
>
> declare i8* nocapture @bar(i8* %p)
>
>
> Correct.
>
>  -Hal
>
>
> Piotr
>
>
> _______________________________________________
> LLVM Developers mailing listllvm-dev at lists.llvm.orghttp://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
> --
> Hal Finkel
> Lead, Compiler Technology and Programming Languages
> Leadership Computing Facility
> Argonne National Laboratory
>
>
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