[Bug debug/49676] inefficiency: DW_AT_GNU_call_site_value calculates everything << 32

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49676

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-11 16:57:29 UTC ---
Author: jakub
Date: Mon Jul 11 16:57:25 2011
New Revision: 176167

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176167
Log:
    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.

Added:
    trunk/gcc/testsuite/gcc.dg/guality/csttest.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c
    trunk/gcc/testsuite/ChangeLog