gcc/testsuite/gcc.target/i386/pr81904.c

/* { dg-do compile } */
/* { dg-options "-mavx512fp16 -mavx512vl -O2 -mprefer-vector-width=512" } */
/* { dg-final { scan-assembler-times "vfmaddsub...ph\[ \t\]+\[^\n\]*%zmm\[0-9\]" 1 } } */
/* { dg-final { scan-assembler-times "vfmsubadd...ph\[ \t\]+\[^\n\]*%zmm\[0-9\]" 1 } } */

void vec_fmaddsub_fp16(int n, _Float16 da_r, _Float16 *x, _Float16* y, _Float16* __restrict z)
{
  for (int i = 0; i < 32; i += 2)
    {
      z[i] =  da_r * x[i] - y[i];
      z[i+1]  =  da_r * x[i+1] + y[i+1];
    }
}

void vec_fmasubadd_fp16(int n, _Float16 da_r, _Float16 *x, _Float16* y, _Float16* __restrict z)
{
  for (int i = 0; i < 32; i += 2)
    {
      z[i] =  da_r * x[i] + y[i];
      z[i+1]  =  da_r * x[i+1] - y[i+1];
    }
}