# Intrinsics for FP Multiplication Operations

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
--- | --- | ---
`_mm_mul_round_sd`, `_mm_mask_mul_round_sd`, `_mm_maskz_mul_round_sd` `_mm_mask_mul_sd`, `_mm_maskz_mul_sd` | Multiplies rounded vectors. | `VMULSD`
`_mm_mul_round_ss`, `_mm_mask_mul_round_ss`, `_mm_maskz_mul_round_ss` `_mm_mask_mul_ss`, `_mm_maskz_mul_ss` | Multiplies rounded vectors. | `VMULSS`
`_mm512_mul_round_pd`, `_mm512_mask_mul_round_pd`, `_mm512_maskz_mul_round_pd` `_mm512_mul_pd`, `_mm512_mask_mul_pd`, `_mm512_maskz_mul_pd` | Multiplies rounded float64 vectors. | `VMULPD`
`_mm512_mul_round_ps`, `_mm512_mask_mul_round_ps`, `_mm512_maskz_mul_round_ps` `_mm512_mul_ps`, `_mm512_mask_mul_ps`, `_mm512_maskz_mul_ps` | Multiplies rounded float32 vectors. | `VMULPS`

variable | definition
--- | ---
k | writemask used as a selector
a | first source vector element
b | second source vector element
src | source element to use based on writemask result
round | Rounding control values; these can be one of the following (along with the `sae` suppress all exceptions flag): `_MM_FROUND_TO_NEAREST_INT` - rounds to nearest even `_MM_FROUND_TO_NEG_INF` - rounds to negative infinity `_MM_FROUND_TO_POS_INF` - rounds to positive infinity `_MM_FROUND_TO_ZERO` - rounds to zero `_MM_FROUND_CUR_DIRECTION` - rounds using default from MXCSR register

_mm512_mul_pd

    extern __m512d __cdecl _mm512_mul_pd(__m512d a, __m512d b);

Multiplies packed float64 elements in a and b, stores the result.

_mm512_mask_mul_pd

    extern __m512d __cdecl _mm512_mask_mul_pd(__m512d src, __mmask8 k, __m512d a, __m512d b);

Multiplies packed float64 elements in a and b, stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_maskz_mul_pd

    extern __m512d __cdecl _mm512_maskz_mul_pd(__mmask8 k, __m512d a, __m512d b);

Multiplies packed float64 elements in a and b, stores the result using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

_mm512_mul_round_pd

    extern __m512d __cdecl _mm512_mul_round_pd(__m512d a, __m512d b, int round);

Multiplies packed float64 elements in a and b, stores the result.

_mm512_mask_mul_round_pd

    extern __m512d __cdecl _mm512_mask_mul_round_pd(__m512d src, __mmask8 k, __m512d a, __m512d b, int round);

Multiplies packed float64 elements in a and b, stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_maskz_mul_round_pd

    extern __m512d __cdecl _mm512_maskz_mul_round_pd(__mmask8 k, __m512d a, __m512d b, int round);

Multiplies packed float64 elements in a and b, stores the result using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

_mm512_mul_ps

    extern __m512 __cdecl _mm512_mul_ps(__m512 a, __m512 b);

Multiplies packed float32 elements in a and b, stores the result.

_mm512_mask_mul_ps

    extern __m512 __cdecl _mm512_mask_mul_ps(__m512 src, __mmask16 k, __m512 a, __m512 b);

Multiplies packed float32 elements in a and b, stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_maskz_mul_ps

    extern __m512 __cdecl _mm512_maskz_mul_ps(__mmask16 k, __m512 a, __m512 b);

Multiplies packed float32 elements in a and b, stores the result using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

_mm512_mul_round_ps

    extern __m512 __cdecl _mm512_mul_round_ps(__m512 a, __m512 b, int round);

Multiplies packed float32 elements in a and b, stores the result.

_mm512_mask_mul_round_ps

    extern __m512 __cdecl _mm512_mask_mul_round_ps(__m512 src, __mmask16 k, __m512 a, __m512 b, int round);

Multiplies packed float32 elements in a and b, stores the result using writemask k (elements are copied from src when the corresponding mask bit is not set).

_mm512_maskz_mul_round_ps

    extern __m512 __cdecl _mm512_maskz_mul_round_ps(__mmask16 k, __m512 a, __m512 b, int round);

Multiplies packed float32 elements in a and b, stores the result using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

_mm_mul_round_sd

    extern __m128d __cdecl _mm_mul_round_sd(__m128d a, __m128d b, int round);

Multiplies the lower float64 element in a and b, stores the result in the lower destination element, and copy the upper element from a to the upper destination element.

_mm_mask_mul_round_sd

    extern __m128d __cdecl _mm_mask_mul_round_sd(__m128d src, __mmask8 k, __m128d a, __m128d b, int round);

Multiplies the lower float64 element in a and b, stores the result in the lower destination element using writemask k (the element is copied from src when mask bit 0 is not set), and copy the upper element from a to the upper destination element.

_mm_maskz_mul_round_sd

    extern __m128d __cdecl _mm_maskz_mul_round_sd(__mmask8 k, __m128d a, __m128d b, int round);

Multiplies the lower float64 element in a and b, stores the result in the lower destination element using zeromask k (the element is zeroed out when mask bit 0 is not set), and copy the upper element from a to the upper destination element.

_mm_mask_mul_sd

    extern __m128d __cdecl  _mm_mask_mul_sd(__m128d src, __mmask8 k, __m128d a, __m128d b);

Multiplies the lower float64 element in a and b, stores the result in the lower destination element using writemask k (the element is copied from src when mask bit 0 is not set), and copy the upper element from a to the upper destination element.

_mm_maskz_mul_sd

    extern __m128d __cdecl _mm_maskz_mul_sd(__mmask8 k, __m128d a, __m128d b);

Multiplies the lower float64 element in a and b, stores the result in the lower destination element using zeromask k (the element is zeroed out when mask bit 0 is not set), and copy the upper element from a to the upper destination element.

_mm_mul_round_ss

    extern __m128 __cdecl _mm_mul_round_ss(__m128 a, __m128 b, int round);

Multiplies the lower float32 element in a and b, stores the result in the lower destination element, and copy the upper three packed elements from a to the upper destination elements.

_mm_mask_mul_round_ss

    extern __m128 __cdecl _mm_mask_mul_round_ss(__m128 src, __mmask8 k, __m128 a, __m128 b, int round);

Multiplies the lower float32 element in a and b, stores the result in the lower destination element using writemask k (the element is copied from src when mask bit 0 is not set), and copy the upper three packed elements from a to the upper destination elements.

_mm_maskz_mul_round_ss

    extern __m128 __cdecl _mm_maskz_mul_round_ss(__mmask8 k, __m128 a, __m128 b, int round);

Multiplies the lower float32 element in a and b, stores the result in the lower destination element using zeromask k (the element is zeroed out when mask bit 0 is not set), and copy the upper three packed elements from a to the upper destination elements.

_mm_mask_mul_ss

    extern __m128 __cdecl _mm_mask_mul_ss(__m128 src, __mmask8 k, __m128 a, __m128 b);

Multiplies the lower float32 element in a and b, stores the result in the lower destination element using writemask k (the element is copied from src when mask bit 0 is not set), and copy the upper three packed elements from a to the upper destination elements.

_mm_maskz_mul_ss

    extern __m128 __cdecl _mm_maskz_mul_ss(__mmask8 k, __m128 a, __m128 b);

Multiplies the lower float32 element in a and b, stores the result in the lower destination element using zeromask k (the element is zeroed out when mask bit 0 is not set), and copy the upper three packed elements from a to the upper destination elements.

Parent topic: Intrinsics for Multiplication Operations