Would __builtin_shufflevector(__a, __a, 0, 1, -1, -1) work?
On Thu, Jul 18, 2013 at 5:42 PM, Chandler Carruth <[email protected]>wrote: > > On Thu, Jul 18, 2013 at 5:32 PM, Katya Romanova < > [email protected]> wrote: > >> - __m128d __zero = _mm_setzero_pd(); >> - return __builtin_shufflevector(__a, __zero, 0, 1, 2, 2); >> + return (__m256d)__builtin_ia32_pd256_pd((__v2df)__a); >> > > I think this is the wrong approach. > > Rather than switching these to use an x86-specific builtin, instead it > would be better to provide some generic form to produce an undef input to a > shufflevector. That is a generally useful and completely target independent > concept. > > _______________________________________________ > cfe-commits mailing list > [email protected] > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits > > -- ~Craig
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