[Bug tree-optimization/89386] New: Generation of vectorized MULHRS (Multiply High with Round and Scale) instruction

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89386

            Bug ID: 89386
           Summary: Generation of vectorized MULHRS (Multiply High with
                    Round and Scale) instruction
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com
  Target Milestone: ---

This PR is similar to PR85693 and PR85694, where missing generation of
vectorized SAD (Sum of Absolute Difference) and AVG (Average) instruction was
reported.

Following code:

--cut here--
#define N 1024

unsigned short as[N], bs[N], cs[N];

void
foo_short (void)
{
  int i;

  for (i = 0; i < N; i++)
    as[i] = ((((int)bs[i] * (int)cs[i]) >> 14) + 1) >> 1;
}
--cut here--

should vectorize with pmulhrsw SSSE3 instruction.