re PR tree-optimization/82838 (ICE in verify_ssa failed w/ store-merging)

	PR tree-optimization/82838
	* gimple-ssa-store-merging.c
	(imm_store_chain_info::output_merged_store): Call force_gimple_operand_1
	on a separate gimple_seq which is then appended to seq.

	* gcc.c-torture/compile/pr82838.c: New test.

From-SVN: r254457

gcc/ChangeLog

+2017-11-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/82838
+	* gimple-ssa-store-merging.c
+	(imm_store_chain_info::output_merged_store): Call force_gimple_operand_1
+	on a separate gimple_seq which is then appended to seq.
+
 2017-11-06  Jeff Law  <law@redhat.com>
 
 	PR target/82788

gcc/gimple-ssa-store-merging.c

@@ -1642,10 +1642,14 @@ imm_store_chain_info::output_merged_store (merged_store_group *group)
       else if (operand_equal_p (base_addr, op.base_addr, 0))
 	load_addr[j] = addr;
       else
-	load_addr[j]
-	  = force_gimple_operand_1 (unshare_expr (op.base_addr),
-				    &seq, is_gimple_mem_ref_addr,
-				    NULL_TREE);
+	{
+	  gimple_seq this_seq;
+	  load_addr[j]
+	    = force_gimple_operand_1 (unshare_expr (op.base_addr),
+				      &this_seq, is_gimple_mem_ref_addr,
+				      NULL_TREE);
+	  gimple_seq_add_seq_without_update (&seq, this_seq);
+	}
     }
 
   FOR_EACH_VEC_ELT (split_stores, i, split_store)

gcc/testsuite/ChangeLog

+2017-11-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/82838
+	* gcc.c-torture/compile/pr82838.c: New test.
+
 2017-11-06  Jeff Law  <law@redhat.com>
 
 	PR target/82788

gcc/testsuite/gcc.c-torture/compile/pr82838.c

+/* PR tree-optimization/82838 */
+
+struct S { unsigned short a, b, c; };
+struct S f[10];
+
+void
+foo (int e)
+{
+  struct S *x;
+  f[e].b = x[e].a;
+  f[e].c = x[e].b;
+}