[Bug target/54445] TLS array lookup with negative constant is not combined into a single instruction

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54445

--- Comment #2 from Uros Bizjak <ubizjak at gmail dot com> 2012-09-01 14:53:44 
UTC ---
This is due to the definition of x86_64_immediate_operand predicate, following
part:

        case UNSPEC:
          switch (XINT (op1, 1))
        {
        case UNSPEC_DTPOFF:
        case UNSPEC_NTPOFF:
          if (offset > 0
              && trunc_int_for_mode (offset, SImode) == offset)
            return true;
        }

I don't know why negative offsets are not allowed here.