Available on (x86 or x86-64) and target feature
sse4.1 and x86-64 only.Expand description
Round the lower single-precision (32-bit) floating-point element in b
using the ROUNDING parameter, store the result as a single-precision
floating-point element in the lower element of the intrinsic result,
and copies the upper 3 packed elements from a to the upper elements
of the intrinsic result.
Rounding is done according to the rounding parameter, which can be one of:
#[cfg(target_arch = "x86")]
use std::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use std::arch::x86_64::*;
// round to nearest, and suppress exceptions:
_MM_FROUND_TO_NEAREST_INT | _MM_FROUND_NO_EXC;
// round down, and suppress exceptions:
_MM_FROUND_TO_NEG_INF | _MM_FROUND_NO_EXC;
// round up, and suppress exceptions:
_MM_FROUND_TO_POS_INF | _MM_FROUND_NO_EXC;
// truncate, and suppress exceptions:
_MM_FROUND_TO_ZERO | _MM_FROUND_NO_EXC;
// use MXCSR.RC; see `_MM_SET_ROUNDING_MODE`:
_MM_FROUND_CUR_DIRECTION;