[Bug target/104775] New: [9/10/11/12 Regression] Failure to assemble on s390x with -fsanitize=undefined

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104775

            Bug ID: 104775
           Summary: [9/10/11/12 Regression] Failure to assemble on s390x
                    with -fsanitize=undefined
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

struct A {
  virtual long foo () const;
  int a;
};
long
A::foo () const
{
  int sec = a / 0;
  return sec;
}

test with -O2 -w -m64 -march=zEC12 -fsanitize=undefined fails to assemble
Music_Emu.s: Assembler messages:
Music_Emu.s:56: Error: syntax error; missing ')' after base register
Music_Emu.s:56: Error: junk at end of line: `%r12)'
The regression appeared some time between r240000 and r245002 so during GCC 7
development, haven't bisected when exactly.
The problematic assembly line is:
        clgte   %r1,0(%r5,%r12)