C-SKY: Fix FAIL of gcc.dg/torture/stackalign/builtin-return-2.c.

gcc/ChangeLog:

	* config/csky/csky.md (untyped_call): Emit clobber for return
	registers to mark them used.

diff --git a/gcc/config/csky/csky.md b/gcc/config/csky/csky.md
index b980d4c8fcb447487a6ea31ba9f7a6d1aa205b91..f91d851cb2c228f55a78a5ad5a0e497a4d7c28c3 100644 (file)
--- a/gcc/config/csky/csky.md
+++ b/gcc/config/csky/csky.md
@@ -3258,6 +3258,10 @@
 
   emit_call_insn (gen_call (operands[0], const0_rtx));
 
+  for (int i = 0; i < XVECLEN (operands[2], 0); i++)
+    emit_clobber (SET_SRC (XVECEXP (operands[2], 0, i)));
+  emit_insn (gen_blockage ());
+
   for (i = 0; i < XVECLEN (operands[2], 0); i++)
     {
       rtx set = XVECEXP (operands[2], 0, i);