[Bug target/70799] New: STV pass does not convert DImode shifts and rotates

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70799

            Bug ID: 70799
           Summary: STV pass does not convert DImode shifts and rotates
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com
                CC: hjl.tools at gmail dot com, ienkovich at gcc dot gnu.org
  Target Milestone: ---

These should all be converted to DImode vector shifts for SSE2/AVX2 32bit
target (and similar for rotates):

long long a, b;

void test_ll (void)
{
  a = b << 1;
}

void test_llv (int c)
{
  a = b << c;
}

unsigned long long d, e;

void test_lr (void)
{
  d = e >> 1;
}

void test_lrv (int c)
{
  d = e >> c;
}

void test_ar (void)
{
  a = b >> 1;
}

void test_arv (int c)
{
  a = b >> c;
}