[cfe-dev] Removal of built-ins

[Craig Topper via cfe-dev]

Eric, as I'm the one who deleted this builtin, and probably many previous
ones. Should I look into updating the script?

On Thu, Jun 2, 2016 at 5:25 PM, John McCall via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> On Jun 1, 2016, at 1:11 PM, Eric Christopher via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
> On Wed, Jun 1, 2016 at 8:37 AM C Bergström <cfe-dev at lists.llvm.org> wrote:
>
>> On Wed, Jun 1, 2016 at 11:26 PM, Reid Kleckner <rnk at google.com> wrote:
>> > Clang has never exposed the same set of builtins as GCC, though:
>> > http://clang.llvm.org/compatibility.html#vector_builtins
>> >
>> > I don't think we need to keep our IA32 vector builtin interface stable
>> when
>> > the *mmintrin.h headers already provide a stable, portable, cross-vendor
>> > interface to the same functionality.
>>
>> I didn't mention gcc.. I agree they shouldn't be used in the wild, but
>> they are..
>>
>> Why not leave the built-in support and under the hood just map that to
>> something more portable? This is a pretty low cost (zero?) maintenance
>> burden...
>>
>> Intentionally breaking stuff without at least giving any warning or
>> marking as deprecated in a major release 1st.. Is this an exception
>> because __built-ins are grey area support?
>>
>>
> What Reid is saying has been our policy from the beginning, there's even a
> script in the repository (that I sadly haven't updated in years) that helps
> handle the transition between builtins and the *mmintrin.h headers.
>
>
> I agree that we don't need to support undocumented builtins.
>
> John.
>
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>


-- 
~Craig
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