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 prototypes for Streaming SIMD Extensions intrinsics are in the xmmintrin.h header file.
| 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_ps | 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 _mm_cmpeq_ss(__m128 a, __m128 b)
Compare for equality.
r0 := (a0 == b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpeq_ps(__m128 a, __m128 b)
Compare for equality.
r0 := (a0 == b0) ? 0xffffffff : 0x0
r1 := (a1 == b1) ? 0xffffffff : 0x0
r2 := (a2 == b2) ? 0xffffffff : 0x0
r3 := (a3 == b3) ? 0xffffffff : 0x0
__m128 _mm_cmplt_ss(__m128 a, __m128 b)
Compare for less-than.
r0 := (a0 < b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmplt_ps(__m128 a, __m128 b)
Compare for less-than.
r0 := (a0 < b0) ? 0xffffffff : 0x0
r1 := (a1 < b1) ? 0xffffffff : 0x0
r2 := (a2 < b2) ? 0xffffffff : 0x0
r3 := (a3 < b3) ? 0xffffffff : 0x0
__m128 _mm_cmple_ss(__m128 a, __m128 b)
Compare for less-than-or-equal.
r0 := (a0 <= b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmple_ps(__m128 a, __m128 b)
Compare for less-than-or-equal.
r0 := (a0 <= b0) ? 0xffffffff : 0x0
r1 := (a1 <= b1) ? 0xffffffff : 0x0
r2 := (a2 <= b2) ? 0xffffffff : 0x0
r3 := (a3 <= b3) ? 0xffffffff : 0x0
__m128 _mm_cmpgt_ss(__m128 a, __m128 b)
Compare for greater-than.
r0 := (a0 > b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpgt_ps(__m128 a, __m128 b)
Compare for greater-than.
r0 := (a0 > b0) ? 0xffffffff : 0x0
r1 := (a1 > b1) ? 0xffffffff : 0x0
r2 := (a2 > b2) ? 0xffffffff : 0x0
r3 := (a3 > b3) ? 0xffffffff : 0x0
__m128 _mm_cmpge_ss(__m128 a, __m128 b)
Compare for greater-than-or-equal.
r0 := (a0 >= b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpge_ps(__m128 a, __m128 b)
Compare for greater-than-or-equal.
r0 := (a0 >= b0) ? 0xffffffff : 0x0
r1 := (a1 >= b1) ? 0xffffffff : 0x0
r2 := (a2 >= b2) ? 0xffffffff : 0x0
r3 := (a3 >= b3) ? 0xffffffff : 0x0
__m128 _mm_cmpneq_ss(__m128 a, __m128 b)
Compare for inequality.
r0 := (a0 != b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpneq_ps(__m128 a, __m128 b)
Compare for inequality.
r0 := (a0 != b0) ? 0xffffffff : 0x0
r1 := (a1 != b1) ? 0xffffffff : 0x0
r2 := (a2 != b2) ? 0xffffffff : 0x0
r3 := (a3 != b3) ? 0xffffffff : 0x0
__m128 _mm_cmpnlt_ss(__m128 a, __m128 b)
Compare for not-less-than.
r0 := !(a0 < b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpnlt_ps(__m128 a, __m128 b)
Compare for not-less-than.
r0 := !(a0 < b0) ? 0xffffffff : 0x0
r1 := !(a1 < b1) ? 0xffffffff : 0x0
r2 := !(a2 < b2) ? 0xffffffff : 0x0
r3 := !(a3 < b3) ? 0xffffffff : 0x0
__m128 _mm_cmpnle_ss(__m128 a, __m128 b)
__m128 _mm_cmpnle_ps(__m128 a, __m128 b)Compare for not-less-than-or-equal.
r0 := !(a0 <= b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
Compare for not-less-than-or-equal.
r0 := !(a0 <= b0) ? 0xffffffff : 0x0
r1 := !(a1 <= b1) ? 0xffffffff : 0x0
r2 := !(a2 <= b2) ? 0xffffffff : 0x0
r3 := !(a3 <= b3) ? 0xffffffff : 0x0
__m128 _mm_cmpngt_ss(__m128 a, __m128 b)
Compare for not-greater-than.
r0 := !(a0 > b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpngt_ps(__m128 a, __m128 b)
Compare for not-greater-than.
r0 := !(a0 > b0) ? 0xffffffff : 0x0
r1 := !(a1 > b1) ? 0xffffffff : 0x0
r2 := !(a2 > b2) ? 0xffffffff : 0x0
r3 := !(a3 > b3) ? 0xffffffff : 0x0
__m128 _mm_cmpnge_ss(__m128 a, __m128 b)
Compare for not-greater-than-or-equal.
r0 := !(a0 >= b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpnge_ps(__m128 a, __m128 b)
Compare for not-greater-than-or-equal.
r0 := !(a0 >= b0) ? 0xffffffff : 0x0
r1 := !(a1 >= b1) ? 0xffffffff : 0x0
r2 := !(a2 >= b2) ? 0xffffffff : 0x0
r3 := !(a3 >= b3) ? 0xffffffff : 0x0
__m128 _mm_cmpord_ss(__m128 a, __m128 b)
Compare for ordered.
r0 := (a0 ord? b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpord_ps(__m128 a, __m128 b)
Compare for ordered.
r0 := (a0 ord? b0) ? 0xffffffff : 0x0
r1 := (a1 ord? b1) ? 0xffffffff : 0x0
r2 := (a2 ord? b2) ? 0xffffffff : 0x0
r3 := (a3 ord? b3) ? 0xffffffff : 0x0
__m128 _mm_cmpunord_ss(__m128 a, __m128 b)
Compare for unordered.
r0 := (a0 unord? b0) ? 0xffffffff : 0x0
r1 := a1 ; r2 := a2 ; r3 := a3
__m128 _mm_cmpunord_ps(__m128 a, __m128 b)
Compare for unordered.
r0 := (a0 unord? b0) ? 0xffffffff : 0x0
r1 := (a1 unord? b1) ? 0xffffffff : 0x0
r2 := (a2 unord? b2) ? 0xffffffff : 0x0
r3 := (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 := (a0 != b0) ? 0x1 : 0x0