[cfe-dev] What happened to __builtin_shuffle

[Nemanja Ivanovic via cfe-dev]

I would imagine __builtin_shufflevector is what you're after. However that
takes integer constants to build a shuffle mask from. I'm not aware of one
that takes a shuffle mask vector (which seems like your code is passing
in). So I'm not sure if this is of any help to you at all.

In any case, perhaps the code should wrap calls like this one in something
like:
#ifndef __has_builtin
#define __has_builtin(x) 0
#endif
and
#if __has_builtin(__builtin_shuffle)
...
#endif

On Tue, Aug 22, 2017 at 9:21 AM, Armin K. via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi,
>
> I've built LLVM/Clang 5.0.0rc2 on Linux x86_64, and I am using its runtime
> libraries
> (compiler-rt, libc++, openmp).
>
> While building pixman, I get the following error with 5.0.0rc2, which did
> not happen
> with 4.0.1:
>
> utils-prng.c:207:27: error: use of unknown builtin '__builtin_shuffle'
> [-Wimplicit-function-declaration]
>             randdata.vb = __builtin_shuffle (randdata.vb,
> bswap_shufflemask);
>
> There's no mention of __builtin_shuffle in release notes, so I need to ask:
>
> What happened to __builtin_shuffle, and what should be used instead of it
> so I can
> get rid of the compiler error above?
>
> Thanks!
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