Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 7/13/2023
Public
Document Table of Contents

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).