Function _mm512_mul_pch 

pub fn _mm512_mul_pch(a: __m512h, b: __m512h) -> __m512h

Available on x86 and target feature avx512fp16 only.

Multiply packed complex numbers in a and b, and store the results in dst. Each complex number is composed of two adjacent half-precision (16-bit) floating-point elements, which defines the complex number complex = vec.fp16[0] + i * vec.fp16[1].

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