[Bug target/91188] strict_low_part operations do not work

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91188

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
The testcase involving HImode pattern:

--cut here--
struct S1
{
  unsigned short val;
  unsigned short pad1;
};

struct S1
__attribute__((noinline))
test_andw (struct S1 a, unsigned short b)
{
  a.val &= b;

  return a;
}
--cut here--

gcc -O2:

test_andw:
        movl    %edi, %eax      # 2     [c=4 l=2]  *movsi_internal/0
        andw    %si, %ax        # 9     [c=4 l=3]  *andhi_1_slp
        ret             # 23    [c=0 l=1]  simple_return_internal