[Bug middle-end/55116] [4.8 Regression] LRA failed to decompose ASHIFT

hjl.tools at gmail dot com gcc-bugzilla@gcc.gnu.org
Mon Oct 29 13:14:00 GMT 2012


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55116

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2012-10-29 13:14:03 UTC ---
ix86_decompose_address has

            case ASHIFT:
              if (index)
                return 0;
              index = XEXP (op, 0);
              tmp = XEXP (op, 1);
              if (!CONST_INT_P (tmp))
                return 0;
              scale = INTVAL (tmp);
              if ((unsigned HOST_WIDE_INT) scale > 3)
                return 0;
              scale = 1 << scale;
              break;



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