MMX™ Technology Compare Intrinsics

The prototypes for MMX™ technology compare intrinsics are in the mmintrin.h header file.

Intrinsic Name	Operation	Corresponding MMX Instruction
_mm_cmpeq_pi8	Equal	PCMPEQB
_mm_cmpeq_pi16	Equal	PCMPEQW
_mm_cmpeq_pi32	Equal	PCMPEQD
_mm_cmpgt_pi8	Greater Than	PCMPGTB
_mm_cmpgt_pi16	Greater Than	PCMPGTW
_mm_cmpgt_pi32	Greater Than	PCMPGTD

__m64 _mm_ cmpeq_pi8(__m64 m1, __m64 m2)

Sets the corresponding 8-bit resulting values to all ones if the 8-bit values in m1 are equal to the corresponding 8-bit values in m2; otherwise sets them to all zeros.

__m64 _mm_ cmpeq_pi16(__m64 m1, __m64 m2)

Sets the corresponding 16-bit resulting values to all ones if the 16-bit values in m1 are equal to the corresponding 16-bit values in m2; otherwise set them to all zeros.

__m64 _mm_ cmpeq_pi32(__m64 m1, __m64 m2)

Sets the corresponding 32-bit resulting values to all ones if the 32-bit values in m1 are equal to the corresponding 32-bit values in m2; otherwise set them to all zeros.

__m64 _mm_ cmpgt_pi8(__m64 m1, __m64 m2)

Sets the corresponding 8-bit resulting values to all ones if the 8-bit signed values in m1 are greater than the corresponding 8-bit signed values in m2; otherwise set them to all zeros.

__m64 _mm_ cmpgt_pi16(__m64 m1, __m64 m2)

Sets the corresponding 16-bit resulting values to all ones if the 16-bit signed values in m1 are greater than the corresponding 16-bit signed values in m2; otherwise set them to all zeros.

__m64 _mm_ cmpgt_pi32(__m64 m1, __m64 m2)

Sets the corresponding 32-bit resulting values to all ones, if the 32-bit signed values in m1 are greater than the corresponding 32-bit signed values in m2; otherwise set them all to zeros.