See summary table in Summary of Memory and Initialization topic.

The prototypes for Streaming SIMD Extensions (SSE) intrinsics are in the xmmintrin.h header file.

__m128 _mm_load_ss(float * p )

Loads an SP FP value into the low word and clears the
upper three words.

r0 := *p

r1 := 0.0 ; r2 := 0.0 ; r3 := 0.0

__m128 _mm_load_ps1(float * p )

Loads a single SP FP value, copying it into all four
words.

r0 := *p

r1 := *p

r2 := *p

r3 := *p

__m128 _mm_load_ps(float * p )

Loads four SP FP values. The address must be 16-byte-aligned.

r0 := p[0]

r1 := p[1]

r2 := p[2]

r3 := p[3]

__m128 _mm_loadu_ps(float * p)

Loads four SP FP values. The address need not be 16-byte-aligned.

r0 := p[0]

r1 := p[1]

r2 := p[2]

r3 := p[3]

__m128 _mm_loadr_ps(float * p)

Loads four SP FP values in reverse order. The address
must be 16-byte-aligned.

r0 := p[3]

r1 := p[2]

r2 := p[1]

r3 := p[0]