Comparisons

Microsoft Specific

Each comparison intrinsic performs a comparison of a and b. For the packed form, the two double-precision, floating-point values of a and b are compared, and a 128-bit mask is returned. For the scalar form, the lower double-precision, floating-point values of a and b are compared, and a 64-bit mask is returned; the upper double-precision, floating-point value is passed through from a. The mask is set to 0xffffffffffffffff for each element where the comparison is true and 0x0 where the comparison is false. The r following the instruction name indicates that the operands to the instruction are reversed in the actual implementation.

The comparison intrinsics are listed in the following table, followed by detailed descriptions.

SSE2 intrinsics use the __m128, __m128i, and __m128d data types, which are not supported on Itanium Processor Family (IPF) processors. Any SSE2 intrinsics that use the __m64 data type are not supported on x64 processors.

The emmintrin.h header file contains the declarations for the SSE2 instructions intrinsics.

Comparison Intrinsics

Intrinsic name	Corresponding instruction	Compare for
_mm_cmpeq_pd	CMPEQPD	Equality
_mm_cmplt_pd	CMPLTPD	Less than
_mm_cmple_pd	CMPLEPD	Less than or equal
_mm_cmpgt_pd	CMPLTPDr	Greater than
_mm_cmpge_pd	CMPLEPDr	Greater than or equal
_mm_cmpord_pd	CMPORDPD	Ordered
_mm_cmpunord_pd	CMPUNORDPD	Unordered
_mm_cmpneq_pd	CMPNEQPD	Inequality
_mm_cmpnlt_pd	CMPNLTPD	Not less than
_mm_cmpnle_pd	CMPNLEPD	Not less than or equal
_mm_cmpngt_pd	CMPNLTPDr	Not greater than
_mm_cmpnge_pd	CMPLEPDr	Not greater than or equal
_mm_cmpeq_sd	CMPEQSD	Equality
_mm_cmplt_sd	CMPLTSD	Less than
_mm_cmple_sd	CMPLESD	Less than or equal
_mm_cmpgt_sd	CMPLTSDr	Greater than
_mm_cmpge_sd	CMPLESDr	Greater than or equal
_mm_cmpord_sd	CMPORDSD	Ordered
_mm_cmpunord_sd	CMPUNORDSD	Unordered
_mm_cmpneq_sd	CMPNEQSD	Inequality
_mm_cmpnlt_sd	CMPNLTSD	Not less than
_mm_cmpnle_sd	CMPNLESD	Not less than or equal
_mm_cmpngt_sd	CMPNLTSDr	Not greater than
_mm_cmpnge_sd	CMPNLESDR	Not greater than or equal
_mm_comieq_sd	COMISD	Equality
_mm_comilt_sd	COMISD	Less than
_mm_comile_sd	COMISD	Less than or equal
_mm_comigt_sd	COMISD	Greater than
_mm_comige_sd	COMISD	Greater than or equal
_mm_comineq_sd	COMISD	Not equal
_mm_ucomieq_sd	UCOMISD	Equality
_mm_ucomilt_sd	UCOMISD	Less than
_mm_ucomile_sd	UCOMISD	Less than or equal
_mm_ucomigt_sd	UCOMISD	Greater than
_mm_ucomige_sd	UCOMISD	Greater than or equal
_mm_ucomineq_sd	UCOMISD	Not equal

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 2 Instructions