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tree-ssa-dom.c (record_equivalences_from_incoming_edge): Only look at case labels if the immediate dominator is also the only predecessor.

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* tree-ssa-dom.c (record_equivalences_from_incoming_edge):
	Only look at case labels if the immediate dominator is also
	the only predecessor.  Don't look for more case labels if the
	first seen is a case range.

From-SVN: r82480
This commit is contained in:
Steven Bosscher 2004-05-31 10:18:36 +00:00 committed by Steven Bosscher
parent 58128b9da1
commit 1c052514f6
2 changed files with 13 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-05-31 Steven Bosscher <stevenb@suse.de>
* tree-ssa-dom.c (record_equivalences_from_incoming_edge):
Only look at case labels if the immediate dominator is also
the only predecessor. Don't look for more case labels if the
first seen is a case range.
2004-05-31 Kazu Hirata <kazu@cs.umass.edu>
* builtins.c: Add a prototype for fold_builtin_strchr().

8
gcc/tree-ssa-dom.c
View File

@ -1450,9 +1450,12 @@ record_equivalences_from_incoming_edge (struct dom_walk_data *walk_data,
&bd->avail_exprs,
bb,
&bd->vrp_variables);
/* Similarly when the parent block ended in a SWITCH_EXPR. */
/* Similarly when the parent block ended in a SWITCH_EXPR.
We can only know the value of the switch's condition if the dominator
parent is also the only predecessor of this block. */
else if (parent_block_last_stmt
&& bb->pred->pred_next == NULL
&& bb->pred->src == parent
&& TREE_CODE (parent_block_last_stmt) == SWITCH_EXPR)
{
tree switch_cond = SWITCH_COND (parent_block_last_stmt);
@ -1473,7 +1476,7 @@ record_equivalences_from_incoming_edge (struct dom_walk_data *walk_data,
tree elt = TREE_VEC_ELT (switch_vec, i);
if (label_to_block (CASE_LABEL (elt)) == bb)
{
if (++case_count > 1)
if (++case_count > 1 || CASE_HIGH (elt))
break;
match_case = elt;
}
@ -1484,6 +1487,7 @@ record_equivalences_from_incoming_edge (struct dom_walk_data *walk_data,
the exact value of SWITCH_COND which caused us to get to
this block. Record that equivalence in EQ_EXPR_VALUE. */
if (case_count == 1
&& match_case
&& CASE_LOW (match_case)
&& !CASE_HIGH (match_case))
{