Handle POLY_INT_CSTs in declare_return_value

SVE allows variable-length vectors to be returned by value,
which tripped the assert in declare_return_variable.

2019-11-08  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-inline.c (declare_return_variable): Check for poly_int_tree_p
	instead of INTEGER_CST.

gcc/testsuite/
	* gcc.target/aarch64/sve/acle/general/inline_1.c: New test.

From-SVN: r277956

gcc/ChangeLog

+2019-11-08  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* tree-inline.c (declare_return_variable): Check for poly_int_tree_p
+	instead of INTEGER_CST.
+
 2019-11-08  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/92324

gcc/testsuite/ChangeLog

+2019-11-08  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* gcc.target/aarch64/sve/acle/general/inline_1.c: New test.
+
 2019-11-08  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/92324

gcc/testsuite/gcc.target/aarch64/sve/acle/general/inline_1.c

+/* { dg-options "-O2" } */
+
+#pragma GCC aarch64 "arm_sve.h"
+
+static inline svint32_t foo () { return svdup_s32 (32); }
+svint32_t bar () { return svadd_x (svptrue_b8 (), foo (), 1); }

gcc/tree-inline.c

@@ -3654,7 +3654,7 @@ declare_return_variable (copy_body_data *id, tree return_slot, tree modify_dest,
       /* ??? If we're assigning to a variable sized type, then we must
 	 reuse the destination variable, because we've no good way to
 	 create variable sized temporaries at this point.  */
-      else if (TREE_CODE (TYPE_SIZE_UNIT (caller_type)) != INTEGER_CST)
+      else if (!poly_int_tree_p (TYPE_SIZE_UNIT (caller_type)))
 	use_it = true;
 
       /* If the callee cannot possibly modify MODIFY_DEST, then we can
@@ -3689,7 +3689,7 @@ declare_return_variable (copy_body_data *id, tree return_slot, tree modify_dest,
 	}
     }
 
-  gcc_assert (TREE_CODE (TYPE_SIZE_UNIT (callee_type)) == INTEGER_CST);
+  gcc_assert (poly_int_tree_p (TYPE_SIZE_UNIT (callee_type)));
 
   var = copy_result_decl_to_var (result, id);
   DECL_SEEN_IN_BIND_EXPR_P (var) = 1;