re PR tree-optimization/68157 (internal compiler error: in…

re PR tree-optimization/68157 (internal compiler error: in reassoc_stmt_dominates_stmt_p, at tree-ssa-reassoc.c:1287)

	PR tree-optimization/68157
	* tree-ssa-reassoc.c (attempt_builtin_powi): Set uid of
	pow_stmt or mul_stmt from stmt's uid.
	(reassociate_bb): Set uid of mul_stmt from stmt's uid.

	* g++.dg/opt/pr68157.C: New test.

From-SVN: r230530

gcc/ChangeLog

+2015-11-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/68157
+	* tree-ssa-reassoc.c (attempt_builtin_powi): Set uid of
+	pow_stmt or mul_stmt from stmt's uid.
+	(reassociate_bb): Set uid of mul_stmt from stmt's uid.
+
 2015-11-18  Martin Liska  <mliska@suse.cz>
 
 	* haifa-sched.c (haifa_finish_h_i_d): Release reg_set_list.

gcc/testsuite/ChangeLog

+2015-11-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/68157
+	* g++.dg/opt/pr68157.C: New test.
+
 2015-11-18  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/67790

gcc/testsuite/g++.dg/opt/pr68157.C

+// PR tree-optimization/68157
+// { dg-do compile }
+// { dg-options "-Ofast" }
+
+double a, b, c, d;
+int h, foo ();
+
+void
+bar ()
+{
+  while (foo ())
+    {
+      double e = b * a * a;
+      double f = b * d;
+      if (h)
+	c = e + f;
+    }
+}

gcc/tree-ssa-reassoc.c

@@ -4441,6 +4441,7 @@ attempt_builtin_powi (gimple *stmt, vec<operand_entry *> *ops)
 							   power));
 	      gimple_call_set_lhs (pow_stmt, iter_result);
 	      gimple_set_location (pow_stmt, gimple_location (stmt));
+	      gimple_set_uid (pow_stmt, gimple_uid (stmt));
 	      gsi_insert_before (&gsi, pow_stmt, GSI_SAME_STMT);
 
 	      if (dump_file && (dump_flags & TDF_DETAILS))
@@ -4524,6 +4525,7 @@ attempt_builtin_powi (gimple *stmt, vec<operand_entry *> *ops)
 		  mul_stmt = gimple_build_assign (target_ssa, MULT_EXPR,
 						  op1, op2);
 		  gimple_set_location (mul_stmt, gimple_location (stmt));
+		  gimple_set_uid (mul_stmt, gimple_uid (stmt));
 		  gsi_insert_before (&gsi, mul_stmt, GSI_SAME_STMT);
 		  rf1->repr = target_ssa;
 
@@ -4541,6 +4543,7 @@ attempt_builtin_powi (gimple *stmt, vec<operand_entry *> *ops)
 						       power));
 	  gimple_call_set_lhs (pow_stmt, iter_result);
 	  gimple_set_location (pow_stmt, gimple_location (stmt));
+	  gimple_set_uid (pow_stmt, gimple_uid (stmt));
 	  gsi_insert_before (&gsi, pow_stmt, GSI_SAME_STMT);
 	}
 
@@ -4552,6 +4555,7 @@ attempt_builtin_powi (gimple *stmt, vec<operand_entry *> *ops)
 	  mul_stmt = gimple_build_assign (new_result, MULT_EXPR,
 					  result, iter_result);
 	  gimple_set_location (mul_stmt, gimple_location (stmt));
+	  gimple_set_uid (mul_stmt, gimple_uid (stmt));
 	  gsi_insert_before (&gsi, mul_stmt, GSI_SAME_STMT);
 	  gimple_set_visited (mul_stmt, true);
 	  result = new_result;
@@ -4908,6 +4912,7 @@ reassociate_bb (basic_block bb)
 		      mul_stmt = gimple_build_assign (lhs, MULT_EXPR,
 						      powi_result, target_ssa);
 		      gimple_set_location (mul_stmt, gimple_location (stmt));
+		      gimple_set_uid (mul_stmt, gimple_uid (stmt));
 		      gsi_insert_after (&gsi, mul_stmt, GSI_NEW_STMT);
 		    }
 		}