# Function core::arch::x86::_mm_maskz_roundscale_sh

source ·

    pub unsafe fn _mm_maskz_roundscale_sh(
        k: __mmask8,
        a: __m128h,
        b: __m128h,
        const IMM8: 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 only.
Expand description

Round the lower half-precision (16-bit) floating-point element in b to the number of fraction bits specified by imm8, 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.

Rounding is done according to the imm8 parameter, which can be one of:

    _MM_FROUND_TO_NEAREST_INT // round to nearest
    _MM_FROUND_TO_NEG_INF     // round down
    _MM_FROUND_TO_POS_INF     // round up
    _MM_FROUND_TO_ZERO        // truncate
    _MM_FROUND_CUR_DIRECTION  // use MXCSR.RC; see _MM_SET_ROUNDING_MODE

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