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comment unreachable code

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(grafted from 112c8993049ea0c4ef8e3e4f257880626f8b39e1
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This commit is contained in:
Gael Guennebaud 2018-04-03 23:16:43 +02:00
parent 170914dbbc
commit 59398aa2bb
1 changed files with 4 additions and 1 deletions
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5
Eigen/src/Core/arch/AVX/PacketMath.h
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@ -333,9 +333,12 @@ template<> EIGEN_STRONG_INLINE Packet4d preverse(const Packet4d& a)
{
__m256d tmp = _mm256_shuffle_pd(a,a,5);
return _mm256_permute2f128_pd(tmp, tmp, 1);
#if 0
// This version is unlikely to be faster as _mm256_shuffle_ps and _mm256_permute_pd
// exhibit the same latency/throughput, but it is here for future reference/benchmarking...
__m256d swap_halves = _mm256_permute2f128_pd(a,a,1);
return _mm256_permute_pd(swap_halves,5);
#endif
}
// pabs should be ok