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| author | Richard Biener <rguenther@suse.de> | 2017-01-10 14:50:32 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2017-01-10 14:50:32 +0000 |
| commit | aae23693f8a8274100dafe63c3d2e6498b24461f (patch) | |
| tree | 9bc726b30e0677da201192f129dcd363130717d8 /gcc/tree-call-cdce.c | |
| parent | a0843aedb8ad71a7b14847fb4d52a64f8ce5a501 (diff) | |
| download | gcc-aae23693f8a8274100dafe63c3d2e6498b24461f.zip gcc-aae23693f8a8274100dafe63c3d2e6498b24461f.tar.gz gcc-aae23693f8a8274100dafe63c3d2e6498b24461f.tar.bz2 | |
re PR tree-optimization/79034 (error: missing PHI def in verify_gimple_in_cfg)
2016-01-10 Richard Biener <rguenther@suse.de>
PR tree-optimization/79034
* tree-call-cdce.c (shrink_wrap_one_built_in_call_with_conds):
Propagate out degenerate PHIs in the joiner.
* g++.dg/torture/pr79034.C: New testcase.
From-SVN: r244274
Diffstat (limited to 'gcc/tree-call-cdce.c')
| -rw-r--r-- | gcc/tree-call-cdce.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/gcc/tree-call-cdce.c b/gcc/tree-call-cdce.c index e668304..10d2c47 100644 --- a/gcc/tree-call-cdce.c +++ b/gcc/tree-call-cdce.c @@ -811,7 +811,18 @@ shrink_wrap_one_built_in_call_with_conds (gcall *bi_call, vec <gimple *> conds, if (EDGE_COUNT (join_tgt_in_edge_from_call->dest->preds) > 1) join_tgt_bb = split_edge (join_tgt_in_edge_from_call); else - join_tgt_bb = join_tgt_in_edge_from_call->dest; + { + join_tgt_bb = join_tgt_in_edge_from_call->dest; + /* We may have degenerate PHIs in the destination. Propagate + those out. */ + for (gphi_iterator i = gsi_start_phis (join_tgt_bb); !gsi_end_p (i);) + { + gphi *phi = i.phi (); + replace_uses_by (gimple_phi_result (phi), + gimple_phi_arg_def (phi, 0)); + remove_phi_node (&i, true); + } + } } else { |