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| 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-cfg.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-cfg.c')
| -rw-r--r-- | gcc/tree-cfg.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c index a8cb627..8da55ff 100644 --- a/gcc/tree-cfg.c +++ b/gcc/tree-cfg.c @@ -1322,7 +1322,21 @@ tree_merge_blocks (basic_block a, basic_block b) } else { - replace_uses_by (def, use); + /* If we deal with a PHI for virtual operands, we can simply + propagate these without fussing with folding or updating + the stmt. */ + if (!is_gimple_reg (def)) + { + imm_use_iterator iter; + use_operand_p use_p; + tree stmt; + + FOR_EACH_IMM_USE_STMT (stmt, iter, def) + FOR_EACH_IMM_USE_ON_STMT (use_p, iter) + SET_USE (use_p, use); + } + else + replace_uses_by (def, use); remove_phi_node (phi, NULL, true); } } |