# Intrinsics for Rounding Operations (512-bit)

The prototypes for Intel® Advanced Vector Extensions 512 (Intel® AVX-512) intrinsics are located in the zmmintrin.h header file.
To use these intrinsics, include the immintrin.h file as follows:

    #include <immintrin.h>

Intrinsic Name | Operation | Corresponding Intel® AVX-512 Instruction
--- | --- | ---
`_mm512_ceil_pd`, `_mm512_mask_ceil_pd` | Rounds float64 vector elements to nearest upper integer. | None.
`_mm512_ceil_ps`, `_mm512_mask_ceil_ps` | Rounds float32 vector elements to nearest upper integer. | None.
`_mm512_floor_pd`, `_mm512_mask_floor_pd` | Rounds float64 vector elements to nearest lower integer. | None.
`_mm512_floor_ps`, `_mm512_mask_floor_ps` | Rounds float32 vector elements to nearest lower integer. | None.
`_mm512_nearbyint_pd`, `_mm512_mask_nearbyint_pd` | Rounds float64 vector elements to nearest integer in floating point format. | None.
`_mm512_nearbyint_ps`, `_mm512_mask_nearbyint_ps` | Rounds float32 vector elements to nearest integer in floating point format. | None.
`_mm512_rint_pd`, `_mm512_mask_rint_pd` | Rounds float64 vector elements to nearest even integer. | None.
`_mm512_rint_ps`, `_mm512_mask_rint_ps` | Rounds float32 vector elements to nearest even integer. | None.
`_mm512_svml_round_pd`, `_mm512_mask_svml_round_pd` | Rounds float64 vector elements to nearest integer. | None.
`_mm512_trunc_pd`, `_mm512_mask_trunc_pd` | Rounds float64 vector elements to nearest integer not larger in absolute value. | None.
`_mm512_trunc_ps`, `_mm512_mask_trunc_ps` | Rounds float32 vector elements to nearest integer not larger in absolute value. | None.

variable | definition
--- | ---
k | writemask used as a selector
a | first source vector element
src | source element to use based on writemask result

_mm512_ceil_pd

    extern __m512d __cdecl _mm512_ceil_pd(__m512d a);

Rounds off the elements of float64 vector a to the nearest upper integer value.

_mm512_mask_ceil_pd

    extern __m512d __cdecl _mm512_mask_ceil_pd(__m512d src, __mmask8 k, __m512d a);

Rounds off the elements of float64 vector a to the nearest upper integer value, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_ceil_ps

    extern __m512 __cdecl _mm512_ceil_ps(__m512 a);

Rounds off the elements of float32 vector a to the nearest upper integer value.

_mm512_mask_ceil_ps

    extern __m512 __cdecl _mm512_mask_ceil_ps(__m512 src, __mmask16 k, __m512 a);

Rounds off the elements of float32 vector a to the nearest upper integer value, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_floor_pd

    extern __m512d __cdecl _mm512_floor_pd(__m512d a);

Rounds off the elements of float64 vector a to the nearest lower integer value.

_mm512_mask_floor_pd

    extern __m512d __cdecl _mm512_mask_floor_pd(__m512d src, __mmask8 k, __m512d a);

Rounds off the elements of float64 vector a to the nearest lower integer value, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_floor_ps

    extern __m512 __cdecl _mm512_floor_ps(__m512 a);

Rounds off the elements of float32 vector a to the nearest lower integer value.

_mm512_mask_floor_ps

    extern __m512 __cdecl _mm512_mask_floor_ps(__m512 src, __mmask16 k, __m512 a);

Rounds off the elements of float32 vector a to the nearest lower integer value, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_nearbyint_pd

    extern __m512d __cdecl _mm512_nearbyint_pd(__m512d a);

Rounds off the elements of float64 vector a to the nearest integer value in floating point format without raising the inexact exception.

_mm512_mask_nearbyint_pd

    extern __m512d __cdecl _mm512_mask_nearbyint_pd(__m512d src, __mmask8 k, __m512d a);

Rounds off the elements of float64 vector a to the nearest integer value in floating point format without raising the inexact exception, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_nearbyint_ps

    extern __m512 __cdecl _mm512_nearbyint_ps(__m512 a);

Rounds off the elements of float32 vector a to the nearest integer value in floating point format without raising the inexact exception.

_mm512_mask_nearbyint_ps

    extern __m512 __cdecl _mm512_mask_nearbyint_ps(__m512 src, __mmask16 k, __m512 a);

Rounds off the elements of float32 vector a to the nearest integer value in floating point format without raising the inexact exception, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_rint_pd

    extern __m512d __cdecl _mm512_rint_pd(__m512d a);

Rounds off the elements of float64 vector a to the nearest even integer value.

_mm512_mask_rint_pd

    extern __m512d __cdecl _mm512_mask_rint_pd(__m512d src, __mmask8 k, __m512d a);

Rounds off the elements of float64 vector a to the nearest even integer value, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_rint_ps

    extern __m512 __cdecl _mm512_rint_ps(__m512 a);

Rounds off the elements of float32 vector a to the nearest even integer value.

_mm512_mask_rint_ps

    extern __m512 __cdecl _mm512_mask_rint_ps(__m512 src, __mmask16 k, __m512 a);

Rounds off the elements of float32 vector a to the nearest even integer value, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_svml_round_pd

    extern __m512d __cdecl _mm512_svml_round_pd(__m512d a);

Rounds off the elements of vector a to the nearest integer value. This intrinsic rounds the halfway cases away from zero regardless of the current rounding direction, instead of to the nearest even integer like the `_mm512_rint_pd` intrinsic.

_mm512_mask_svml_round_pd

    extern __m512d __cdecl _mm512_mask_svml_round_pd(__m512d src, __mmask8 k, __m512d a);

Rounds off the elements of vector a to the nearest integer value. This intrinsic rounds the halfway cases away from zero regardless of the current rounding direction, instead of to the nearest even integer like the `_mm512_rint_pd` intrinsic.

The result is stored using writemask k (elements are copied from src when the corresponding mask bit is not set)

_mm512_trunc_pd

    extern __m512d __cdecl _mm512_trunc_pd(__m512d a);

Rounds off the elements of float64 vector a to the nearest integer value which is not larger in absolute value.

_mm512_mask_trunc_pd

    extern __m512d __cdecl _mm512_mask_trunc_pd(__m512d src, __mmask8 k, __m512d a);

Rounds off the elements of float64 vector a to the nearest integer value which is not larger in absolute value, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_trunc_ps

    extern __m512 __cdecl _mm512_trunc_ps(__m512 a);

Rounds off the elements of float32 vector a to the nearest integer value which is not larger in absolute value.

_mm512_mask_trunc_ps

    extern __m512 __cdecl _mm512_mask_trunc_ps(__m512 src, __mmask16 k, __m512 a);

Rounds off the elements of float32 vector a to the nearest integer value which is not larger in absolute value, and stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

Parent topic: Intrinsics for Short Vector Math Library Operations (SVML)