[cfe-dev] Removal of built-ins

[Reid Kleckner via cfe-dev]

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.

On Wed, Jun 1, 2016 at 8:18 AM, C Bergström <cfe-dev at lists.llvm.org> wrote:

> Hi
>
> Some recent commits are quite disturbing, but I can understand if it
> was intentional..
>
> This commit and it's message for example
>
> https://github.com/llvm-mirror/clang/commit/53a73530fec13416edeb495e6041b3b3e1340178
>
> Taking one random built-in as an example
> __builtin_ia32_storedqu
>
> A quick google search using that as a keyword brings up a small
> handful of source publicly available using it.
>
> Removing the usage from the internal header implementation +1 , but
> removing support for it entirely seems like a regression.
> --------
> Yes I know users should never use or count on __builtins but they do
> sometimes.. Slightly less dangerous are intrinsics, which I thought
> are the recommended way to give users as much control over the
> generated code while not resorting to inline asm.
>
> I think someone got over zealous.. or is it really the intention to
> just break it?
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