[Bug target/99822] New: Assembler messages: Error: integer register expected in the extended/shifted operand register at operand 3 -- `adds x1,xzr,#2'

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99822

            Bug ID: 99822
           Summary: Assembler messages: Error: integer register expected
                    in the extended/shifted operand register at operand 3
                    -- `adds x1,xzr,#2'
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: assemble-failure
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: aarch64-linux-gnu

GNU as 2.35.2 fails to assemble output of gcc-11.0.1-alpha20210328 snapshot
(g:499fa254ae8c9752d8c2cf3130b13ffddfd83546) generated w/ -O1 for the following
testcase:

int zt, bm, p5 = 1;

void __attribute__ ((cold))
l2 (unsigned long int hz)
{
  __int128 d9 = 0;
  unsigned long int *mg = hz ? &hz : (unsigned long int *) &d9;

  while (d9 < 1)
    {
      bm = bm > d9;
      bm = bm == (d9 = bm || hz);

      hz = 0x197000000;
      d9 = hz * hz;

      while (p5 < 1)
        {
          bm = ((hz = 3) ? zt : 0) > 0x1001;
          if (bm != 0)
            {
              __int128 *nd = (__int128 *) bm;

              *nd /= 3;
            }

          *mg = 0x1001;
          p5 -= *mg;
        }

      for (zt = 0; zt >= 0; zt += 2)
        d9 = 0;

      d9 += 2;
    }
}

% aarch64-linux-gnu-gcc-11.0.1 -O1 -w -c drr4usrh.c
/tmp/ccu8CYtI.s: Assembler messages:
/tmp/ccu8CYtI.s:109: Error: integer register expected in the extended/shifted
operand register at operand 3 -- `adds x1,xzr,#2'