[Bug rtl-optimization/33721] [meta-bug] Gcc can't properly align stack variable

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33721

--- Comment #7 from Richard Henderson <rth at gcc dot gnu.org> 2010-10-09 22:05:55 UTC ---
Author: rth
Date: Sat Oct  9 22:05:51 2010
New Revision: 165240

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165240
Log:
    PR rtl-opt/33721
    * explow.c (allocate_dynamic_stack_space): Add REQUIRED_ALIGN parm,
    remove TARGET parm, convert KNOWN_ALIGN parm to SIZE_ALIGN.  Honor
    required_align, tidy the code a bit.  Emit split_stack code in the
    right place.  Mark the return value with the alignment properly.
    * expr.h (allocate_dynamic_stack_space): Update decl.
    * builtins.c (expand_builtin_apply): Update call to
    allocate_dynamic_stack_space.
    (expand_builtin_alloca): Likewise.  Remove TARGET parameter.
    * calls.c (initialize_argument_information): Update call to
    allocate_dynamic_stack_space.
    (expand_call): Likewise.

    * cfgexpand.c (get_decl_align_unit): Don't limit alignment.
    Don't update_stack_alignment here.
    (alloc_stack_frame_space): Make ALIGN unsigned.
    (stack_var_cmp): Sort by alignment too.
    (partition_stack_vars): Don't merge large and small alignment vars.
    (expand_one_stack_var_at): Add BASE and BASE_ALIGN parameters.
    Take care when BASE is not virtual_stack_vars_rtx.
    (expand_stack_vars): Allocate dynamic stack space for large
    alignment variables.
    (expand_one_stack_var): Update all to expand_one_stack_var_at.
    (defer_stack_allocation): True for large alignment vars.
    (update_stack_alignment): Merge into ...
    (expand_one_var): ... here.
    (gimple_expand_cfg): Place code from expand_stack_vars.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/builtins.c
    trunk/gcc/calls.c
    trunk/gcc/cfgexpand.c
    trunk/gcc/explow.c
    trunk/gcc/expr.h
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/lib/target-supports.exp