_mm_fnmsub_sh
Classification
AVX-512, Arithmetic, CPUID Test: AVX512_FP16
Header File
Instruction
VFNMSUB132SH xmm, xmm, xmm
Synopsis
_mm_fnmsub_sh(__m128h a, __m128h b, __m128h c);
Description
Multiply the lower half-precision (16-bit) floating-point elements in "a" and "b", and subtract the lower element in "c" from the negated intermediate result. Store the result in the lower element of "dst", and copy the upper 7 packed elements from "a" to the upper elements of "dst".
Operation
dst.fp16[0] := -(a.fp16[0] * b.fp16[0]) - c.fp16[0]
dst[127:16] := a[127:16]
dst[MAX:128] := 0