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-rw-r--r--lib/compiler/src/beam_utils.erl9
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl
index dc8079d0b7..45cdf8a659 100644
--- a/lib/compiler/src/beam_utils.erl
+++ b/lib/compiler/src/beam_utils.erl
@@ -489,10 +489,13 @@ check_liveness(R, [{bs_context_to_binary,S}|Is], St) ->
S -> {used,St};
_ -> check_liveness(R, Is, St)
end;
-check_liveness(R, [{loop_rec,{f,_},{x,0}}|Is], St) ->
+check_liveness(R, [{loop_rec,{f,_},{x,0}}|_], St) ->
case R of
- {x,_} -> {killed,St};
- _ -> check_liveness(R, Is, St)
+ {x,_} ->
+ {killed,St};
+ _ ->
+ %% y register. Rarely happens. Be very conversative.
+ {unknown,St}
end;
check_liveness(R, [{loop_rec_end,{f,Fail}}|_], St) ->
check_liveness_at(R, Fail, St);