http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50251
--- Comment #7 from vries at gcc dot gnu.org 2011-09-01 19:26:48 UTC ---
> fold_builtin_alloca_for_var should record stack alignment change
After expand_var for D.2129 with 128-bit alignment, x_rtl looks like this:
...
(gdb) p x_rtl
$20 = {expr = {x_pending_stack_adjust = 0, x_inhibit_defer_pop = 0,
x_stack_pointer_delta = 0, x_saveregs_value = 0x0, x_apply_args_value = 0x0,
x_forced_labels = 0x0}, emit = {x_reg_rtx_no = 70,
x_first_label_num = 11, x_first_insn = 0x0, x_last_insn = 0x0,
sequence_stack = 0xf7d5557c, x_cur_insn_uid = 2, x_cur_debug_insn_uid = 1,
x_last_location = 0, regno_pointer_align_length = 159,
regno_pointer_align = 0x981a428 ""}, varasm = {pool = 0xf7df9294,
deferred_constants = 0}, args = {pops_args = 0, size = 0, pretend_args_size =
0, arg_offset_rtx = 0x0, info = {words = 0, nregs = 0,
regno = 0, fastcall = 0, sse_words = 0, sse_nregs = 0, warn_avx = 0,
warn_sse = 0, warn_mmx = 0, sse_regno = 0, mmx_words = 0, mmx_nregs = 0,
mmx_regno = 0, maybe_vaarg = 0, caller = 0,
float_in_sse = 0, call_abi = SYSV_ABI}, internal_arg_pointer = 0x0},
subsections = {hot_section_label = 0x0, cold_section_label = 0x0,
hot_section_end_label = 0x0, cold_section_end_label = 0x0},
eh = {ehr_stackadj = 0x0, ehr_handler = 0x0, ehr_label = 0x0, sjlj_fc = 0x0,
sjlj_exit_after = 0x0, action_record_data = 0x0, call_site_record = {0x0,
0x0}}, outgoing_args_size = 0, return_rtx = 0x0,
hard_reg_initial_vals = 0x0, stack_protect_guard = 0x0,
x_nonlocal_goto_handler_labels = 0x0, x_return_label = 0x0,
x_naked_return_label = 0x0, x_stack_slot_list = 0x0, frame_space_list = 0x0,
x_stack_check_probe_note = 0x0, x_arg_pointer_save_area = 0x0, drap_reg =
0x0, x_frame_offset = 0, x_parm_birth_insn = 0x0, x_used_temp_slots = 0x0,
x_avail_temp_slots = 0x0, x_temp_slot_level = 0,
stack_alignment_needed = 128, preferred_stack_boundary = 32,
parm_stack_boundary = 0, max_used_stack_slot_alignment = 128,
stack_alignment_estimated = 128, epilogue_delay_list = 0x0,
accesses_prior_frames = false, calls_eh_return = false, saves_all_registers =
false, has_nonlocal_goto = false, has_asm_statement = false,
all_throwers_are_sibcalls = false, limit_stack = false,
profile = false, uses_const_pool = false, uses_pic_offset_table = false,
uses_eh_lsda = false, tail_call_emit = false, arg_pointer_save_area_init =
false, frame_pointer_needed = false,
maybe_hot_insn_p = true, stack_realign_needed = false, stack_realign_tried =
false, need_drap = false, stack_realign_processed = false,
stack_realign_finalized = false, dbr_scheduled_p = false,
nothrow = false, asm_clobbers = {0, 0}}
...
These are the relevant values set by expand_one_var:
...
stack_alignment_estimated = 128
stack_alignment_needed = 128
max_used_stack_slot_alignment = 128
...
Is there anything needed that expand_var doesn't do?
