Compare Intrinsics

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

Each comparison intrinsic performs a comparison of a and b. For the packed form, the four SP FP values of a and b are compared, and a 128-bit mask is returned. For the scalar form, the lower SP FP values of a and b are compared, and a 32-bit mask is returned; the upper three SP FP 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 results of each intrinsic operation are placed in a register. This register is illustrated for each intrinsic with R or R0-R3. R0, R1, R2 and R3 each represent one of the four 32-bit pieces of the result register.

Intrinsic Name	Operation	Corresponding Intel® SSE 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

__m128 __cdecl _mm_cmpeq_ss(__m128 a, __m128 b)

Compares for equality.

R0	R1	R2	R3
(a0 == b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpeq_ps(__m128 a, __m128 b)

Compares for equality.

R0	R1	R2	R3
(a0 == b0) ? 0xffffffff : 0x0	(a1 == b1) ? 0xffffffff : 0x0	(a2 == b2) ? 0xffffffff : 0x0	(a3 == b3) ? 0xffffffff : 0x0

__m128 _mm_cmplt_ss(__m128 a, __m128 b)

Compares for less-than.

R0	R1	R2	R3
(a0 < b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmplt_ps(__m128 a, __m128 b)

Compares for less-than.

R0	R1	R2	R3
(a0 < b0) ? 0xffffffff : 0x0	(a1 < b1) ? 0xffffffff : 0x0	(a2 < b2) ? 0xffffffff : 0x0	(a3 < b3) ? 0xffffffff : 0x0

__m128 _mm_cmple_ss(__m128 a, __m128 b)

Compares for less-than-or-equal.

R0	R1	R2	R3
(a0 <= b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmple_ps(__m128 a, __m128 b)

Compares for less-than-or-equal.

R0	R1	R2	R3
(a0 <= b0) ? 0xffffffff : 0x0	(a1 <= b1) ? 0xffffffff : 0x0	(a2 <= b2) ? 0xffffffff : 0x0	(a3 <= b3) ? 0xffffffff : 0x0

__m128 _mm_cmpgt_ss(__m128 a, __m128 b)

Compares for greater-than.

R0	R1	R2	R3
(a0 > b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpgt_ps(__m128 a, __m128 b)

Compares for greater-than.

R0	R1	R2	R3
(a0 > b0) ? 0xffffffff : 0x0	(a1 > b1) ? 0xffffffff : 0x0	(a2 > b2) ? 0xffffffff : 0x0	(a3 > b3) ? 0xffffffff : 0x0

__m128 _mm_cmpge_ss(__m128 a, __m128 b)

Compares for greater-than-or-equal.

R0	R1	R2	R3
(a0 >= b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpge_ps(__m128 a, __m128 b)

Compares for greater-than-or-equal.

R0	R1	R2	R3
(a0 >= b0) ? 0xffffffff : 0x0	(a1 >= b1) ? 0xffffffff : 0x0	(a2 >= b2) ? 0xffffffff : 0x0	(a3 >= b3) ? 0xffffffff : 0x0

__m128 _mm_cmpneq_ss(__m128 a, __m128 b)

Compares for inequality.

R0	R1	R2	R3
(a0 != b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpneq_ps(__m128 a, __m128 b)

Compares for inequality.

R0	R1	R2	R3
(a0 != b0) ? 0xffffffff : 0x0	(a1 != b1) ? 0xffffffff : 0x0	(a2 != b2) ? 0xffffffff : 0x0	(a3 != b3) ? 0xffffffff : 0x0

__m128 _mm_cmpnlt_ss(__m128 a, __m128 b)

Compares for not-less-than.

R0	R1	R2	R3
!(a0 < b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpnlt_ps(__m128 a, __m128 b)

Compares for not-less-than.

R0	R1	R2	R3
!(a0 < b0) ? 0xffffffff : 0x0	!(a1 < b1) ? 0xffffffff : 0x0	!(a2 < b2) ? 0xffffffff : 0x0	!(a3 < b3) ? 0xffffffff : 0x0

__m128 _mm_cmpnle_ss(__m128 a, __m128 b)

Compares for not-less-than-or-equal.

R0	R1	R2	R3
!(a0 <= b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpnle_ps(__m128 a, __m128 b)

Compares for not-less-than-or-equal.

R0	R1	R2	R3
!(a0 <= b0) ? 0xffffffff : 0x0	!(a1 <= b1) ? 0xffffffff : 0x0	!(a2 <= b2) ? 0xffffffff : 0x0	!(a3 <= b3) ? 0xffffffff : 0x0

__m128 _mm_cmpngt_ss(__m128 a, __m128 b)

Compares for not-greater-than.

R0	R1	R2	R3
!(a0 > b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpngt_ps(__m128 a, __m128 b)

Compares for not-greater-than.

R0	R1	R2	R3
!(a0 > b0) ? 0xffffffff : 0x0	!(a1 > b1) ? 0xffffffff : 0x0	!(a2 > b2) ? 0xffffffff : 0x0	!(a3 > b3) ? 0xffffffff : 0x0

__m128 _mm_cmpnge_ss(__m128 a, __m128 b)

Compares for not-greater-than-or-equal.

R0	R1	R2	R3
!(a0 >= b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpnge_ps(__m128 a, __m128 b)

Compares for not-greater-than-or-equal.

R0	R1	R2	R3
!(a0 >= b0) ? 0xffffffff : 0x0	!(a1 >= b1) ? 0xffffffff : 0x0	!(a2 >= b2) ? 0xffffffff : 0x0	!(a3 >= b3) ? 0xffffffff : 0x0

__m128 _mm_cmpord_ss(__m128 a, __m128 b)

Compares for ordered.

R0	R1	R2	R3
(a0 ord? b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpord_ps(__m128 a, __m128 b)

Compares for ordered.

R0	R1	R2	R3
(a0 ord? b0) ? 0xffffffff : 0x0	(a1 ord? b1) ? 0xffffffff : 0x0	(a2 ord? b2) ? 0xffffffff : 0x0	(a3 ord? b3) ? 0xffffffff : 0x0

__m128 _mm_cmpunord_ss(__m128 a, __m128 b)

Compares for unordered.

R0	R1	R2	R3
(a0 unord? b0) ? 0xffffffff : 0x0	a1	a2	a3

__m128 _mm_cmpunord_ps(__m128 a, __m128 b)

Compares for unordered.

R0	R1	R2	R3
(a0 unord? b0) ? 0xffffffff : 0x0	(a1 unord? b1) ? 0xffffffff : 0x0	(a2 unord? b2) ? 0xffffffff : 0x0	(a3 unord? b3) ? 0xffffffff : 0x0

int _mm_comieq_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a equal to b. If a and b are equal, 1 is returned. Otherwise 0 is returned.

R
(a0 == b0) ? 0x1 : 0x0

int _mm_comilt_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a less than b. If a is less than b, 1 is returned. Otherwise 0 is returned.

R
(a0 < b0) ? 0x1 : 0x0

int _mm_comile_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a less than or equal to b. If a is less than or equal to b, 1 is returned. Otherwise 0 is returned.

R
(a0 <= b0) ? 0x1 : 0x0

int _mm_comigt_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a greater than b. If a is greater than b are equal, 1 is returned. Otherwise 0 is returned.

R
(a0 > b0) ? 0x1 : 0x0

int _mm_comige_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a greater than or equal to b. If a is greater than or equal to b, 1 is returned. Otherwise 0 is returned.

R
(a0 >= b0) ? 0x1 : 0x0

int _mm_comineq_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a not equal to b. If a and b are not equal, 1 is returned. Otherwise 0 is returned.

R
(a0 != b0) ? 0x1 : 0x0

int _mm_ucomieq_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a equal to b. If a and b are equal, 1 is returned. Otherwise 0 is returned.

R
(a0 == b0) ? 0x1 : 0x0

int _mm_ucomilt_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a less than b. If a is less than b, 1 is returned. Otherwise 0 is returned.

R
(a0 < b0) ? 0x1 : 0x0

int _mm_ucomile_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a less than or equal to b. If a is less than or equal to b, 1 is returned. Otherwise 0 is returned.

R
(a0 <= b0) ? 0x1 : 0x0

int _mm_ucomigt_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a greater than b. If a is greater than or equal to b, 1 is returned. Otherwise 0 is returned.

R
(a0 > b0) ? 0x1 : 0x0

int _mm_ucomige_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a greater than or equal to b. If a is greater than or equal to b, 1 is returned. Otherwise 0 is returned.

R
(a0 >= b0) ? 0x1 : 0x0

int _mm_ucomineq_ss(__m128 a, __m128 b)

Compares the lower SP FP value of a and b for a not equal to b. If a and b are not equal, 1 is returned. Otherwise 0 is returned.

R
r := (a0 != b0) ? 0x1 : 0x0