Accelerando

ACCELERATE(x) _mm_set1_ps((float)&x)
DECCELERATE_INTO(x, f) _mm_store_ss(&f, result)

Sample usage:

//accelerate a float into a super-fast 128 mm register
float x = 1.0f;
__m128 vecX = ACCELERATE(x);

//deccelerate a 128 mm register value back to a float
float dexc = 0.0f;
DECCELERATE_INTO(vecX, dexc);