_mm512_cmul_round_pch
Classification
AVX-512, Arithmetic, CPUID Test: AVX512_FP16
Header File
immintrin.h
Instruction
VFCMULCPH zmm, zmm, zmm {er}
Synopsis
 _mm512_cmul_round_pch(__m512h a, __m512h b, const int rounding);
Description
Multiply packed complex numbers in "a" by the complex conjugates of packed complex numbers in "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]", or the complex conjugate "conjugate = vec.fp16[0] - i * vec.fp16[1]". [round_note]
Operation
FOR i := 0 to 15
	dst.fp16[2*i+0] := (a.fp16[2*i+0] * b.fp16[2*i+0]) + (a.fp16[2*i+1] * b.fp16[2*i+1])
	dst.fp16[2*i+1] := (a.fp16[2*i+1] * b.fp16[2*i+0]) - (a.fp16[2*i+0] * b.fp16[2*i+1])
ENDFOR
dst[MAX:512] := 0