Function core::arch::x86_64::_mm_mask_getmant_sh
source · pub unsafe fn _mm_mask_getmant_sh(
src: __m128h,
k: __mmask8,
a: __m128h,
b: __m128h,
const NORM: _MM_MANTISSA_NORM_ENUM,
const SIGN: _MM_MANTISSA_SIGN_ENUM,
) -> __m128h
🔬This is a nightly-only experimental API. (
stdarch_x86_avx512_f16
#127213)Available on (x86 or x86-64) and target feature
avx512fp16
and x86-64 only.Expand description
Normalize the mantissas of the lower half-precision (16-bit) floating-point element in b, 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 7 packed elements from a to the upper elements of dst. This intrinsic essentially calculates
±(2^k)*|x.significand|
, where k depends on the interval range defined by norm and the sign depends on sign and
the source sign.
The mantissa is normalized to the interval specified by interv, which can take the following values:
_MM_MANT_NORM_1_2 // interval [1, 2)
_MM_MANT_NORM_p5_2 // interval [0.5, 2)
_MM_MANT_NORM_p5_1 // interval [0.5, 1)
_MM_MANT_NORM_p75_1p5 // interval [0.75, 1.5)
The sign is determined by sc which can take the following values: