_mm256_maskz_fmul_pch
Classification
AVX-512, Arithmetic, CPUID Test: AVX512_FP16
Header File
Instruction
VFMULCPH ymm {z}, ymm, ymm
Synopsis
_mm256_maskz_fmul_pch(__mmask8 k, __m256h a, __m256h b);
Description
Multiply packed complex numbers in "a" and "b", and store the results in "dst" using zeromask "k" (elements are zeroed out when the corresponding mask bit is not set). 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]".
Operation
FOR i := 0 to 7
IF k[i]
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])
ELSE
dst.fp16[2*i+0] := 0
dst.fp16[2*i+1] := 0
FI
ENDFOR
dst[MAX:256] := 0