diff options
| author | Richard Guenther <rguenther@suse.de> | 2008-01-10 16:59:06 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2008-01-10 16:59:06 +0000 |
| commit | d0f76c4b4fa4e0248b0aeac950fd001dcfc32f4d (patch) | |
| tree | afc9546800253c22fc041a6064d3cc8ed6f5848e /gcc/tree-ssa-copy.c | |
| parent | 90d12f1f04dc8a9e11716c79d2411eb922c13b49 (diff) | |
| download | gcc-d0f76c4b4fa4e0248b0aeac950fd001dcfc32f4d.zip gcc-d0f76c4b4fa4e0248b0aeac950fd001dcfc32f4d.tar.gz gcc-d0f76c4b4fa4e0248b0aeac950fd001dcfc32f4d.tar.bz2 | |
re PR tree-optimization/34683 (SSA rewriting in the loop unroller causes quadratic behavior)
2008-01-10 Richard Guenther <rguenther@suse.de>
PR middle-end/34683
* tree-cfg.c (tree_merge_blocks): Do not go through the
full-blown folding and stmt updating path if we just deal
with virtual operands.
* tree-ssa-copy.c (may_propagate_copy): Do not short-cut
test for abnormal SSA_NAMEs.
From-SVN: r131446
Diffstat (limited to 'gcc/tree-ssa-copy.c')
| -rw-r--r-- | gcc/tree-ssa-copy.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/gcc/tree-ssa-copy.c b/gcc/tree-ssa-copy.c index ae4f50c..7ae6825 100644 --- a/gcc/tree-ssa-copy.c +++ b/gcc/tree-ssa-copy.c @@ -62,6 +62,17 @@ may_propagate_copy (tree dest, tree orig) tree type_d = TREE_TYPE (dest); tree type_o = TREE_TYPE (orig); + /* If ORIG flows in from an abnormal edge, it cannot be propagated. */ + if (TREE_CODE (orig) == SSA_NAME + && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (orig)) + return false; + + /* If DEST is an SSA_NAME that flows from an abnormal edge, then it + cannot be replaced. */ + if (TREE_CODE (dest) == SSA_NAME + && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (dest)) + return false; + /* For memory partitions, copies are OK as long as the memory symbol belongs to the partition. */ if (TREE_CODE (dest) == SSA_NAME @@ -164,17 +175,6 @@ may_propagate_copy (tree dest, tree orig) return false; } - /* If ORIG flows in from an abnormal edge, it cannot be propagated. */ - if (TREE_CODE (orig) == SSA_NAME - && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (orig)) - return false; - - /* If DEST is an SSA_NAME that flows from an abnormal edge, then it - cannot be replaced. */ - if (TREE_CODE (dest) == SSA_NAME - && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (dest)) - return false; - /* Anything else is OK. */ return true; } |