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.
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