# Function _mm_mask_sub_round_sd

1.89.0 · Source

    pub fn _mm_mask_sub_round_sd(
        src: __m128d,
        k: __mmask8,
        a: __m128d,
        b: __m128d,
        const ROUNDING: i32,
    ) -> __m128d

Available on (x86 or x86-64) and target feature `avx512f` and x86 only.
Expand description

Subtract the lower double-precision (64-bit) floating-point element in b from the lower double-precision (64-bit) floating-point element in a, store the result in the lower element of dst 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 element of dst.\

Rounding is done according to the rounding[3:0] 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`

Intel’s documentation