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re PR rtl-optimization/38711 (ira should not be using df-lr except at -O1.)

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PR rtl-optimization/38711
	* ira.c (ira): Remove DF_LIVE if the problem is in the stack.
	(do_reload): Add it back at the end for -O2 and higher.

	* function.c (thread_prologue_and_epilogue_insns): Use
	REG_SET_TO_HARD_REG_SET instead of CLEAR_HARD_REG_SET and
	reg_set_to_hard_reg_set.

From-SVN: r192890
This commit is contained in:
Steven Bosscher 2012-10-28 11:52:11 +00:00
parent 68cc8feb2f
commit 5d51714103
3 changed files with 27 additions and 2 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2012-10-28 Steven Bosscher <steven@gcc.gnu.org>
PR rtl-optimization/38711
* ira.c (ira): Remove DF_LIVE if the problem is in the stack.
(do_reload): Add it back at the end for -O2 and higher.
* function.c (thread_prologue_and_epilogue_insns): Use
REG_SET_TO_HARD_REG_SET instead of CLEAR_HARD_REG_SET and
reg_set_to_hard_reg_set.
2012-10-28 Jan Hubicka <jh@suse.cz>
* ipa-inline.c (edge_badness): Reduce precision; use scc hints.

3
gcc/function.c
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@ -6176,8 +6176,7 @@ thread_prologue_and_epilogue_insns (void)
CLEAR_HARD_REG_BIT (prologue_clobbered, STACK_POINTER_REGNUM);
if (frame_pointer_needed)
CLEAR_HARD_REG_BIT (prologue_clobbered, HARD_FRAME_POINTER_REGNUM);
CLEAR_HARD_REG_SET (live_on_edge);
reg_set_to_hard_reg_set (&live_on_edge,
REG_SET_TO_HARD_REG_SET (live_on_edge,
df_get_live_in (entry_edge->dest));
if (hard_reg_set_intersect_p (live_on_edge, prologue_clobbered))
{

16
gcc/ira.c
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@ -4399,6 +4399,16 @@ ira (FILE *f)
setup_prohibited_mode_move_regs ();
df_note_add_problem ();
/* DF_LIVE can't be used in the register allocator, too many other
parts of the compiler depend on using the "classic" liveness
interpretation of the DF_LR problem. See PR38711.
Remove the problem, so that we don't spend time updating it in
any of the df_analyze() calls during IRA/LRA. */
if (optimize > 1)
df_remove_problem (df_live);
gcc_checking_assert (df_live == NULL);
#ifdef ENABLE_CHECKING
df->changeable_flags |= DF_VERIFY_SCHEDULED;
#endif
@ -4678,6 +4688,12 @@ do_reload (void)
df_scan_alloc (NULL);
df_scan_blocks ();
if (optimize > 1)
{
df_live_add_problem ();
df_live_set_all_dirty ();
}
if (optimize)
df_analyze ();