[LLVMdev] Clang 3.1 __builtin_ia32_pcmpeqd128 doesn't work anymore

[Hal Finkel]

On Mon, 04 Jun 2012 13:29:56 +0200
Duncan Sands <baldrick at free.fr> wrote:

> Hi Christophe,
> 
> > So if i understand right, i can't directly compile the c code using
> > clang. And i need to manually generate some llvm ir to replace the
> > builtin function.
> >
> > Is that right?
> 
> I think so, though I don't know much about clang's support for such
> intrinsics, just what's in
> http://clang.llvm.org/compatibility.html#vector_builtins

I think that you should write to the cfe-dev list about this. Just
because the LLVM intrinsic was removed does not mean that the clang
intrinsic cannot exist. clang should be able to generate the
aforementioned generic IR.

 -Hal

> 
> Ciao, Duncan.
> 
> >
> >
> > 2012/6/4 Duncan Sands <baldrick at free.fr <mailto:baldrick at free.fr>>
> >
> >     Hi Christophe,
> >
> >      > I recently migrate from llvm/clang 2.8 to 3.1.
> >      > The builtin __builtin_ia32_pcmpeqd128 compile and works
> >      > perfectly with
> >     clang 2.8.
> >      > But with clang 3.1, i get the compilation error :
> >      >
> >      > use of unknown builtin '__builtin_ia32_pcmpeqd128'
> >     [-Wimplicit-function-declaration]
> >      >         __v4i comp = __builtin_ia32_pcmpeqd128(vectTag,
> >      > vectTag2);
> >      >
> >      > (cf dummy.c -> clang -c dummy.c -o dummy.o)
> >      >
> >      > Is that normal? Is there an other way to do it?
> >
> >     I think it was removed because you can get the same effect
> > using generic IR: a "icmp eq" of the vectors, followed by a "sext"
> > to the result type.
> >
> >     Ciao, Duncan.
> >     _______________________________________________
> >     LLVM Developers mailing list
> >     LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu>
> > http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >
> >
> 
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-- 
Hal Finkel
Postdoctoral Appointee
Leadership Computing Facility
Argonne National Laboratory