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## _mm_mask_roundscale_pd

# Function _mm_mask_roundscale_pd

1.89.0 · Source

    pub fn _mm_mask_roundscale_pd(
        src: __m128d,
        k: __mmask8,
        a: __m128d,
        const IMM8: i32,
    ) -> __m128d

Available on x86-64 and target feature `avx512f` and target feature `avx512vl` only.
Expand description

Round packed double-precision (64-bit) floating-point elements in a to the number of fraction bits specified by imm8, and store the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).
Rounding is done according to the imm8[2:0] parameter, which can be one of:\

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

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