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

[hjl.tools at gmail dot com]

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;