re PR ipa/87024 (ICE in fold_stmt_1)

2018-08-23  Richard Biener  <rguenther@suse.de>

	PR middle-end/87024
	* tree-inline.c (copy_bb): Drop unused __builtin_va_arg_pack_len
	calls.

	* gcc.dg/pr87024.c: New testcase.

From-SVN: r263805

gcc/ChangeLog

+2018-08-23  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/87024
+	* tree-inline.c (copy_bb): Drop unused __builtin_va_arg_pack_len
+	calls.
+
 2018-08-23  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* config/aarch64/aarch64.c (aarch64_evpc_sve_tbl): Fix handling

gcc/testsuite/ChangeLog

+2018-08-23  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/87024
+	* gcc.dg/pr87024.c: New testcase.
+
 2018-08-23  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* gcc.dg/vect/no-vfa-vect-depend-2.c: Remove XFAIL.

gcc/testsuite/gcc.dg/pr87024.c

+/* { dg-do compile } */
+/* { dg-options "-O -fno-tree-dce" } */
+
+static inline void __attribute__((always_inline))
+mp ()
+{
+  (void) __builtin_va_arg_pack_len ();
+}
+
+void
+ui (void)
+{
+  mp ();
+}

gcc/tree-inline.c

@@ -1951,7 +1951,13 @@ copy_bb (copy_body_data *id, basic_block bb,
 	      for (p = DECL_ARGUMENTS (id->src_fn); p; p = DECL_CHAIN (p))
 		nargs--;
 
-	      if (!gimple_call_va_arg_pack_p (id->call_stmt))
+	      if (!gimple_call_lhs (stmt))
+		{
+		  /* Drop unused calls.  */
+		  gsi_remove (&copy_gsi, false);
+		  continue;
+		}
+	      else if (!gimple_call_va_arg_pack_p (id->call_stmt))
 		{
 		  count = build_int_cst (integer_type_node, nargs);
 		  new_stmt = gimple_build_assign (gimple_call_lhs (stmt), count);