From 924f1573adb661f5f15123b0e7af80bb233418be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Mon, 20 Aug 2018 15:44:05 +0200
Subject: map_SUITE: Cover map_get optimizations in beam_dead

---
 lib/compiler/test/map_SUITE.erl | 59 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/lib/compiler/test/map_SUITE.erl b/lib/compiler/test/map_SUITE.erl
index c004dca834..f1b09869f2 100644
--- a/lib/compiler/test/map_SUITE.erl
+++ b/lib/compiler/test/map_SUITE.erl
@@ -1258,6 +1258,31 @@ t_guard_bifs(Config) when is_list(Config) ->
     {'EXIT',{{badkey,k},_}} = (catch erl_699(#{})),
     {'EXIT',{{badmap,not_a_map},_}} = (catch erl_699(not_a_map)),
 
+    %% Cover optimizations in beam_dead.
+
+    ok = beam_dead_1(#{a=>any,k=>true}),
+    error = beam_dead_1(#{a=>any,k=>false}),
+    error = beam_dead_1(#{a=>any}),
+    error = beam_dead_1(#{}),
+
+    ok = beam_dead_2(#{a=>any,k=>true}),
+    error = beam_dead_2(#{a=>any,k=>false}),
+    error = beam_dead_2(#{a=>any}),
+    error = beam_dead_2(#{}),
+
+    ok = beam_dead_3(#{k=>true}),
+    error = beam_dead_3(#{k=>false}),
+    error = beam_dead_3(#{}),
+
+    ok = beam_dead_4(#{k=>true}),
+    error = beam_dead_4(#{k=>false}),
+    error = beam_dead_4(#{}),
+    error = beam_dead_4(not_a_map),
+
+    ok = beam_dead_5(#{k=>true}),
+    error = beam_dead_5(#{k=>false}),
+    error = beam_dead_3(#{}),
+
     ok.
 
 map_guard_empty() when is_map(#{}); false -> true.
@@ -1298,6 +1323,40 @@ erl_699(M) ->
     %% Used to cause an internal consistency failure.
     {is_map_key(k, M),maps:get(k, M)}.
 
+beam_dead_1(#{a:=_,k:=_}=M) when map_get(k, M) ->
+    ok;
+beam_dead_1(#{}) ->
+    error.
+
+beam_dead_2(M) ->
+    case M of
+        #{a:=_,k:=_} when map_get(k, M) ->
+            ok;
+        #{} ->
+            error
+    end.
+
+beam_dead_3(M) ->
+    case M of
+        #{k:=_} when map_get(k, M) ->
+            ok;
+        #{} ->
+            error
+    end.
+
+beam_dead_4(M) ->
+    case M of
+        #{} when map_get(k, M) ->
+            ok;
+        _ ->
+            error
+    end.
+
+beam_dead_5(#{}=M) when map_get(k, M) ->
+    ok;
+beam_dead_5(#{}) ->
+    error.
+
 t_guard_sequence(Config) when is_list(Config) ->
 	{1, "a"} = map_guard_sequence_1(#{seq=>1,val=>id("a")}),
 	{2, "b"} = map_guard_sequence_1(#{seq=>2,val=>id("b")}),
-- 
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