ssef constructor question

ssef constructor question

Sory, don't undestand much SSE, but why this constructor was commented:

__forceinline ssef           ( float  a ) : m128(_mm_set1_ps(a)) {}

and now this one is used:

__forceinline ssef           ( const float&  a ) : m128(_mm_castsi128_ps(_mm_shuffle_epi32(_mm_castps_si128(_mm_load_ss(&a)), _MM_SHUFFLE(0, 0, 0, 0)))) {}

The other constructors are still using _mm_set_ps(). 

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