PR debug/49676 * dwarf2out.c (int_shift_loc_descriptor): New function. (int_loc_descriptor): If shorter, emit i as (i >> shift), shift, DW_OP_shl for suitable shift value. Similarly, try to optimize large negative values using DW_OP_neg of a positive value if shorter. (size_of_int_shift_loc_descriptor): New function. (size_of_int_loc_descriptor): Adjust to match int_loc_descriptor changes. (mem_loc_descriptor) <case CONST_INT>: Emit zero-extended constants that fit into DWARF2_ADDR_SIZE bytes as int_loc_descriptor + DW_OP_GNU_convert instead of DW_OP_GNU_const_type if the former is shorter. (resolve_addr_in_expr): Optimize DW_OP_plus_uconst with a large addend as added DW_OP_plus if it is shorter. * gcc.dg/guality/csttest.c: New test. From-SVN: r176167
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