/* CPU mode switching
- Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "function.h"
#include "tree-pass.h"
#include "timevar.h"
+#include "df.h"
/* We want target macros for the mode switching code to be able to refer
to instruction attribute values. */
if (eg->flags & EDGE_FALLTHRU)
{
basic_block src_bb = eg->src;
- regset live_at_end = src_bb->il.rtl->global_live_at_end;
rtx last_insn, ret_reg;
gcc_assert (!pre_exit);
if (INSN_P (return_copy))
{
- if (GET_CODE (PATTERN (return_copy)) == USE
- && GET_CODE (XEXP (PATTERN (return_copy), 0)) == REG
- && (FUNCTION_VALUE_REGNO_P
- (REGNO (XEXP (PATTERN (return_copy), 0)))))
- {
- maybe_builtin_apply = 1;
- last_insn = return_copy;
- continue;
- }
- if (GET_CODE (PATTERN (return_copy)) == ASM_INPUT
- && strcmp (XSTR (PATTERN (return_copy), 0), "") == 0)
+ return_copy_pat = PATTERN (return_copy);
+ switch (GET_CODE (return_copy_pat))
{
+ case USE:
+ /* Skip __builtin_apply pattern. */
+ if (GET_CODE (XEXP (return_copy_pat, 0)) == REG
+ && (FUNCTION_VALUE_REGNO_P
+ (REGNO (XEXP (return_copy_pat, 0)))))
+ {
+ maybe_builtin_apply = 1;
+ last_insn = return_copy;
+ continue;
+ }
+ break;
+
+ case ASM_OPERANDS:
+ /* Skip barrier insns. */
+ if (!MEM_VOLATILE_P (return_copy_pat))
+ break;
+
+ /* Fall through. */
+
+ case ASM_INPUT:
+ case UNSPEC_VOLATILE:
last_insn = return_copy;
continue;
+
+ default:
+ break;
}
+
/* If the return register is not (in its entirety)
likely spilled, the return copy might be
partially or completely optimized away. */
return_copy_pat = PATTERN (return_copy);
if (GET_CODE (return_copy_pat) != CLOBBER)
break;
+ else if (!optimize)
+ {
+ /* This might be (clobber (reg [<result>]))
+ when not optimizing. Then check if
+ the previous insn is the clobber for
+ the return register. */
+ copy_reg = SET_DEST (return_copy_pat);
+ if (GET_CODE (copy_reg) == REG
+ && !HARD_REGISTER_NUM_P (REGNO (copy_reg)))
+ {
+ if (INSN_P (PREV_INSN (return_copy)))
+ {
+ return_copy = PREV_INSN (return_copy);
+ return_copy_pat = PATTERN (return_copy);
+ if (GET_CODE (return_copy_pat) != CLOBBER)
+ break;
+ }
+ }
+ }
}
copy_reg = SET_DEST (return_copy_pat);
if (GET_CODE (copy_reg) == REG)
else
{
pre_exit = split_edge (eg);
- COPY_REG_SET (pre_exit->il.rtl->global_live_at_start, live_at_end);
- COPY_REG_SET (pre_exit->il.rtl->global_live_at_end, live_at_end);
}
}
bool emited = false;
basic_block post_entry ATTRIBUTE_UNUSED, pre_exit ATTRIBUTE_UNUSED;
- clear_bb_flags ();
-
for (e = N_ENTITIES - 1, n_entities = 0; e >= 0; e--)
if (OPTIMIZE_MODE_SWITCHING (e))
{
pre_exit = create_pre_exit (n_entities, entity_map, num_modes);
#endif
+ df_analyze ();
+
/* Create the bitmap vectors. */
antic = sbitmap_vector_alloc (last_basic_block, n_entities);
int last_mode = no_mode;
HARD_REG_SET live_now;
- REG_SET_TO_HARD_REG_SET (live_now,
- bb->il.rtl->global_live_at_start);
+ REG_SET_TO_HARD_REG_SET (live_now, df_get_live_in (bb));
/* Pretend the mode is clobbered across abnormal edges. */
{
mode = current_mode[j];
src_bb = eg->src;
- REG_SET_TO_HARD_REG_SET (live_at_edge,
- src_bb->il.rtl->global_live_at_end);
+ REG_SET_TO_HARD_REG_SET (live_at_edge, df_get_live_out (src_bb));
start_sequence ();
EMIT_MODE_SET (entity_map[j], mode, live_at_edge);
}
/* Finished. Free up all the things we've allocated. */
-
sbitmap_vector_free (kill);
sbitmap_vector_free (antic);
sbitmap_vector_free (transp);
return 0;
#endif
- max_regno = max_reg_num ();
- allocate_reg_info (max_regno, FALSE, FALSE);
- update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
- (PROP_DEATH_NOTES | PROP_KILL_DEAD_CODE
- | PROP_SCAN_DEAD_CODE));
-
return 1;
}
rest_of_handle_mode_switching (void)
{
#ifdef OPTIMIZE_MODE_SWITCHING
- no_new_pseudos = 0;
optimize_mode_switching ();
- no_new_pseudos = 1;
#endif /* OPTIMIZE_MODE_SWITCHING */
return 0;
}
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
+ TODO_df_finish |
TODO_dump_func, /* todo_flags_finish */
0 /* letter */
};