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PR/56490

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From-SVN: r196406
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Xinliang David Li 2013-03-02 18:42:26 +00:00 committed by Xinliang David Li
parent 2609a39863
commit 4dc1d68cf2
2 changed files with 9 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2013-03-01 Xinliang David Li <davidxl@google.com>
* tree-ssa-uninit.c (compute_control_dep_chain): Limit post-dom
walk length.
2013-03-01 Jakub Jelinek <jakub@redhat.com>
PR middle-end/56461

5
gcc/tree-ssa-uninit.c
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@ -229,6 +229,7 @@ find_control_equiv_block (basic_block bb)
#define MAX_NUM_CHAINS 8
#define MAX_CHAIN_LEN 5
#define MAX_POSTDOM_CHECK 8
/* Computes the control dependence chains (paths of edges)
for DEP_BB up to the dominating basic block BB (the head node of a
@ -269,6 +270,7 @@ compute_control_dep_chain (basic_block bb, basic_block dep_bb,
FOR_EACH_EDGE (e, ei, bb->succs)
{
basic_block cd_bb;
int post_dom_check = 0;
if (e->flags & (EDGE_FAKE | EDGE_ABNORMAL))
continue;
@ -298,7 +300,8 @@ compute_control_dep_chain (basic_block bb, basic_block dep_bb,
}
cd_bb = find_pdom (cd_bb);
if (cd_bb == EXIT_BLOCK_PTR)
post_dom_check++;
if (cd_bb == EXIT_BLOCK_PTR || post_dom_check > MAX_POSTDOM_CHECK)
break;
}
cur_cd_chain->pop ();