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[PATCH][4/4] Fix PR87117
- From: Richard Biener <rguenther at suse dot de>
- To: gcc-patches at gcc dot gnu dot org
- Date: Tue, 28 Aug 2018 10:38:20 +0200 (CEST)
- Subject: [PATCH][4/4] Fix PR87117
Bootstrap and regtest running on x86_64-unknown-linux-gnu.
2018-08-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/87117
* tree-ssa-sccvn.c (eliminate_dom_walker::eliminate_cleanup):
Handle removed stmt without LHS (GIMPLE_NOP).
Index: gcc/tree-ssa-sccvn.c
===================================================================
--- gcc/tree-ssa-sccvn.c (revision 263906)
+++ gcc/tree-ssa-sccvn.c (working copy)
@@ -5424,31 +5425,28 @@ eliminate_dom_walker::eliminate_cleanup
do_release_defs = false;
}
}
- else
- {
- tree lhs = gimple_get_lhs (stmt);
- if (TREE_CODE (lhs) == SSA_NAME
- && !has_zero_uses (lhs))
- {
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "Keeping eliminated stmt live "
- "as copy because of out-of-region uses\n");
- tree sprime = eliminate_avail (gimple_bb (stmt), lhs);
- gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
- if (is_gimple_assign (stmt))
- {
- gimple_assign_set_rhs_from_tree (&gsi, sprime);
- update_stmt (gsi_stmt (gsi));
- continue;
- }
- else
- {
- gimple *copy = gimple_build_assign (lhs, sprime);
- gsi_insert_before (&gsi, copy, GSI_SAME_STMT);
- do_release_defs = false;
- }
- }
- }
+ else if (tree lhs = gimple_get_lhs (stmt))
+ if (TREE_CODE (lhs) == SSA_NAME
+ && !has_zero_uses (lhs))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "Keeping eliminated stmt live "
+ "as copy because of out-of-region uses\n");
+ tree sprime = eliminate_avail (gimple_bb (stmt), lhs);
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ if (is_gimple_assign (stmt))
+ {
+ gimple_assign_set_rhs_from_tree (&gsi, sprime);
+ update_stmt (gsi_stmt (gsi));
+ continue;
+ }
+ else
+ {
+ gimple *copy = gimple_build_assign (lhs, sprime);
+ gsi_insert_before (&gsi, copy, GSI_SAME_STMT);
+ do_release_defs = false;
+ }
+ }
}
if (dump_file && (dump_flags & TDF_DETAILS))