Function core::arch::x86::_mm_maskz_getmant_sh

pub unsafe fn _mm_maskz_getmant_sh(
    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 only.

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 zeromask k (the element is zeroed out 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:

_MM_MANT_SIGN_src     // sign = sign(src)
_MM_MANT_SIGN_zero    // sign = 0
_MM_MANT_SIGN_nan     // dst = NaN if sign(src) = 1

Intel’s documentation