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## _mm512_mask_mul_round_pch

# Function _mm512_mask_mul_round_pch

1.94.0 · Source

    pub fn _mm512_mask_mul_round_pch(
        src: __m512h,
        k: __mmask16,
        a: __m512h,
        b: __m512h,
        const ROUNDING: i32,
    ) -> __m512h

Available on x86-64 and target feature `avx512fp16` only.
Expand description

Multiply the packed complex numbers in a and b, and store the results in dst using writemask k (the element is copied from src when corresponding mask bit is not set). Each complex number is composed of two adjacent half-precision (16-bit) floating-point elements, which defines the complex number `complex = vec.fp16[0] + i * vec.fp16[1]`.

Rounding is done according to the rounding parameter, which can be one of:

- `_MM_FROUND_TO_NEAREST_INT` | `_MM_FROUND_NO_EXC` : round to nearest and suppress exceptions
- `_MM_FROUND_TO_NEG_INF` | `_MM_FROUND_NO_EXC` : round down and suppress exceptions
- `_MM_FROUND_TO_POS_INF` | `_MM_FROUND_NO_EXC` : round up and suppress exceptions
- `_MM_FROUND_TO_ZERO` | `_MM_FROUND_NO_EXC` : truncate and suppress exceptions
- `_MM_FROUND_CUR_DIRECTION` : use `MXCSR.RC` - see `_MM_SET_ROUNDING_MODE`

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