1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/jump.c b/gcc/jump.c
index 2b46f7b..6ead322 100644
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -999,6 +999,7 @@ sets_cc0_p (rtx x)
 
 /* Follow any unconditional jump at LABEL;
    return the ultimate label reached by any such chain of jumps.
+   Return null if the chain ultimately leads to a return instruction.
    If LABEL is not followed by a jump, return LABEL.
    If the chain loops or we can't find end, return LABEL,
    since that tells caller to avoid changing the insn.