_mm512_fmadd_round_pch
Classification
AVX-512, Arithmetic, CPUID Test: AVX512_FP16
Header File
Instruction
VFMADDCPH zmm, zmm, zmm {er}
Synopsis
_mm512_fmadd_round_pch(__m512h a, __m512h b, __m512h c, const int rounding);
Description
Multiply packed complex numbers in "a" and "b", accumulate to the corresponding complex numbers in "c", 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]".
[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]) + c.fp16[2*i+0]
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]) + c.fp16[2*i+1]
ENDFOR
dst[MAX:512] := 0