Comparison Intrinsics (SSE)

Microsoft Specific

Each comparison intrinsic performs a comparison of a and b. For the packed form, the four single-precision, floating-point values of a and b are compared, and a 128-bit mask is returned. For the scalar form, the lower single-precision, floating-point values of a and b are compared, and a 32-bit mask is returned; the upper three single-precision, floating-point values are passed through from a. The mask is set to 0xffffffff for each element where the comparison is true and 0x0 where the comparison is false.

The superscript 'r' on the instruction indicates that the operands are reversed in the instruction implementation. The compare intrinsics listed in the following table are followed by a description of each intrinsic.

SSE intrinsics use the __m128, __m128i, and __m128d data types, which are not supported on Itanium Processor Family (IPF) processors. Any SSE intrinsics that use the __m64 data type are not supported on x64 processors.

The header file xmmintrin.h contains the declarations for the SSE intrinsics.

Compare Intrinsics

Intrinsic name	Comparison	Corresponding instruction
_mm_cmpeq_ss	Equal	CMPEQSS
_mm_cmpeq_ps	Equal	CMPEQPS
_mm_cmplt_ss	Less than	CMPLTSS
_mm_cmplt_ps	Less than	CMPLTPS
_mm_cmple_ss	Less than or equal	CMPLESS
_mm_cmple_ps	Less than or equal	CMPLEPS
_mm_cmpgt_ss	Greater than	CMPLTSS
_mm_cmpgt_ps	Greater than	CMPLTPS
_mm_cmpge_ss	Greater than or equal	CMPLESS
_mm_cmpge_ps	Greater than or equal	CMPLEPS
_mm_cmpneq_ss	Not equal	CMPNEQSS
_mm_cmpneq_ps	Not equal	CMPNEQPS
_mm_cmpnlt_ss	Not less than	CMPNLTSS
_mm_cmpnlt_ps	Not less than	CMPNLTPS
_mm_cmpnle_ss	Not less than or equal	CMPNLESS
_mm_cmpnle_ps	Not less than or equal	CMPNLEPS
_mm_cmpngt_ss	Not greater than	CMPNLTSS
_mm_cmpngt_ps	Not greater than	CMPNLTPS
_mm_cmpnge_ss	Not greater than or equal	CMPNLESS
_mm_cmpnge_ps	Not greater than or equal	CMPNLEPS
_mm_cmpord_ss	Ordered	CMPORDSS
_mm_cmpord_ps	Ordered	CMPORDPS
_mm_cmpunord_ss	Unordered	CMPUNORDSS
_mm_cmpunord_ps	Unordered	CMPUNORDPS
_mm_comieq_ss	Equal	COMISS
_mm_comilt_ss	Less than	COMISS
_mm_comile_ss	Less than or equal	COMISS
_mm_comigt_ss	Greater than	COMISS
_mm_comige_ss	Greater than or equal	COMISS
_mm_comineq_ss	Not equal	COMISS
_mm_ucomieq_ss	Equal	UCOMISS
_mm_ucomilt_ss	Less than	UCOMISS
_mm_ucomile_ss	Less than or equal	UCOMISS
_mm_ucomigt_ss	Greater than	UCOMISS
_mm_ucomige_ss	Greater than or equal	UCOMISS
_mm_ucomineq_ss	Not equal	UCOMISS

For an explanation of the syntax used in code samples in this topic, see Floating-Point Intrinsics Using Streaming SIMD Extensions.

See Also

Concepts

Floating-Point Intrinsics Using Streaming SIMD Extensions