# Function _mm_round_sd

1.27.0 · Source

    pub fn _mm_round_sd(a: __m128d, b: __m128d, const ROUNDING: i32) -> __m128d

Available on (x86 or x86-64) and target feature `sse4.1` and x86 only.
Expand description

Round the lower double-precision (64-bit) floating-point element in `b` using the `ROUNDING` parameter, store the result as a double-precision floating-point element in the lower element of the intrinsic result, and copies the upper element from `a` to the upper element of the intrinsic result. 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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