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cfglayout.c (fixup_reorder_chain): Postpone deleting dead jump tables...

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* cfglayout.c (fixup_reorder_chain): Postpone deleting dead
	jump tables, move the call to delete_dead_jumptables from here...
	(cfg_layout_finalize): ...to here.  But rebuild jump labels first.
	* cfgrtl.c (cfg_layout_can_merge_blocks_p): When not optimizing,
	don't allow merging of blocks that try_redirect_by_replacing_jump
	also does not handle when not optimizing.

From-SVN: r122957
This commit is contained in:
Steven Bosscher 2007-03-15 20:08:29 +00:00
parent 30bcc02890
commit 49ea3702aa
3 changed files with 17 additions and 4 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2007-03-15 Steven Bosscher <steven@gcc.gnu.org>
PR middle-end/31159
* cfglayout.c (fixup_reorder_chain): Postpone deleting dead
jump tables, move the call to delete_dead_jumptables from here...
(cfg_layout_finalize): ...to here. But rebuild jump labels first.
* cfgrtl.c (cfg_layout_can_merge_blocks_p): When not optimizing,
don't allow merging of blocks that try_redirect_by_replacing_jump
also does not handle when not optimizing.
2007-03-15 Uros Bizjak <ubizjak@gmail.com>
Francois-Xavier Coudert <coudert@clipper.ens.fr>

4
gcc/cfglayout.c
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@ -697,7 +697,6 @@ fixup_reorder_chain (void)
#ifdef ENABLE_CHECKING
verify_insn_chain ();
#endif
delete_dead_jumptables ();
/* Now add jumps and labels as needed to match the blocks new
outgoing edges. */
@ -1193,6 +1192,9 @@ cfg_layout_finalize (void)
fixup_fallthru_exit_predecessor ();
fixup_reorder_chain ();
rebuild_jump_labels (get_insns ());
delete_dead_jumptables ();
#ifdef ENABLE_CHECKING
verify_insn_chain ();
#endif

7
gcc/cfgrtl.c
View File

@ -2519,10 +2519,11 @@ cfg_layout_can_merge_blocks_p (basic_block a, basic_block b)
/* Must be simple edge. */
&& !(single_succ_edge (a)->flags & EDGE_COMPLEX)
&& a != ENTRY_BLOCK_PTR && b != EXIT_BLOCK_PTR
/* If the jump insn has side effects,
we can't kill the edge. */
/* If the jump insn has side effects, we can't kill the edge.
When not optimizing, try_redirect_by_replacing_jump will
not allow us to redirect an edge by replacing a table jump. */
&& (!JUMP_P (BB_END (a))
|| (reload_completed
|| ((!optimize || reload_completed)
? simplejump_p (BB_END (a)) : onlyjump_p (BB_END (a)))));
}