Each comparison intrinsic performs a comparison of a and b. For the packed form, the two DP FP values of a and b are compared, and a 128-bit mask is returned. For the scalar form, the lower DP FP values of a and b are compared, and a 64-bit mask is returned; the upper DP FP 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 for the Streaming SIMD Extensions 2 (SSE2) are listed in the following table followed by detailed descriptions.

The prototypes for SSE2 intrinsics are in the emmintrin.h header file.

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 |

__m128d _mm_cmpeq_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for equality.

r0 := (a0 == b0) ? 0xffffffffffffffff : 0x0

r1 := (a1 == b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmplt_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for a less than
b.

r0 := (a0 < b0) ? 0xffffffffffffffff : 0x0

r1 := (a1 < b1) ? 0xffffffffffffffff : 0x0

___m128d _mm_cmple_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for a less than or equal to b.

r0 := (a0 <= b0) ? 0xffffffffffffffff : 0x0

r1 := (a1 <= b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpgt_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for a greater than
b.

r0 := (a0 > b0) ? 0xffffffffffffffff : 0x0

r1 := (a1 > b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpge_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for a greater than
or equal to b.

r0 := (a0 >= b0) ? 0xffffffffffffffff : 0x0

r1 := (a1 >= b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpord_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for ordered.

r0 := (a0 ord b0) ? 0xffffffffffffffff : 0x0

r1 := (a1 ord b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpunord_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for unordered.

r0 := (a0 unord b0) ? 0xffffffffffffffff : 0x0

r1 := (a1 unord b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpneq_pd ( __m128d a, __m128d b)

Compares the two DP FP values of a
and b for inequality.

r0 := (a0 != b0) ? 0xffffffffffffffff : 0x0

r1 := (a1 != b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpnlt_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for a not less than
b.

r0 := !(a0 < b0) ? 0xffffffffffffffff : 0x0

r1 := !(a1 < b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpnle_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for a not less than
or equal to b.

r0 := !(a0 <= b0) ? 0xffffffffffffffff : 0x0

r1 := !(a1 <= b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpngt_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for a not greater
than b.

r0 := !(a0 > b0) ? 0xffffffffffffffff : 0x0

r1 := !(a1 > b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpnge_pd(__m128d a, __m128d b)

Compares the two DP FP values of a
and b for a not greater
than or equal to b.

r0 := !(a0 >= b0) ? 0xffffffffffffffff : 0x0

r1 := !(a1 >= b1) ? 0xffffffffffffffff : 0x0

__m128d _mm_cmpeq_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for equality. The upper DP FP value is passed
through from a.

r0 := (a0 == b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmplt_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for a less than
b. The upper DP FP value is passed through from
a.

r0 := (a0 < b0) ? 0xffffffffffffffff : 0x0

r1 := i1

__m128d _mm_cmple_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for a less than
or equal to b. The upper DP FP value is passed
through from a.

r0 := (a0 <= b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpgt_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for a greater than
b. The upper DP FP value is passed through from
a.

r0 := (a0 > b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpge_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for a greater than
or equal to b. The upper DP FP value is passed
through from a.

r0 := (a0 >= b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpord_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for ordered. The upper DP FP value is passed
through from a.

r0 := (a0 ord b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpunord_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for unordered. The upper DP FP value is
passed through from a.

r0 := (a0 unord b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpneq_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for inequality. The upper DP FP value is
passed through from a.

r0 := (a0 != b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpnlt_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for a not less than
b. The upper DP FP value is passed through from
a.

r0 := !(a0 < b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpnle_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for a not less than
or equal to b. The upper DP FP value is passed
through from a.

r0 := !(a0 <= b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpngt_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for a not greater
than b. The upper DP FP value is passed through
from a.

r0 := !(a0 > b0) ? 0xffffffffffffffff : 0x0

r1 := a1

__m128d _mm_cmpnge_sd(__m128d a, __m128d b)

Compares the lower DP FP value of a
and b for a not greater
than or equal to b. The upper DP FP value is passed
through from a.

r0 := !(a0 >= b0) ? 0xffffffffffffffff : 0x0

r1 := a1

int _mm_comieq_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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_ucomige_sd(__m128d a, __m128d b)

Compares the lower DP 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_sd(__m128d a, __m128d b)

Compares the lower DP 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