Function core::arch::x86_64::_mm_maskz_fnmsub_round_sh

pub unsafe fn _mm_maskz_fnmsub_round_sh(
    k: __mmask8,
    a: __m128h,
    b: __m128h,
    c: __m128h,
    const ROUNDING: i32,
) -> __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.

Multiply the lower half-precision (16-bit) floating-point elements in a and b, and subtract the intermediate result from the lower element in c. Store the result in the lower element of dst using zeromask k (the element is zeroed out when the mask bit 0 is not set), and copy the upper 7 packed elements from a to the upper elements of dst.

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

Intel’s documentation