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-rw-r--r--lib/compiler/test/match_SUITE.erl22
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/compiler/test/match_SUITE.erl b/lib/compiler/test/match_SUITE.erl
index e3f842b668..72e5356a8d 100644
--- a/lib/compiler/test/match_SUITE.erl
+++ b/lib/compiler/test/match_SUITE.erl
@@ -378,6 +378,13 @@ untuplify(Config) when is_list(Config) ->
%% We do this to cover sys_core_fold:unalias_pat/1.
{1,2,3,4,alias,{[1,2],{3,4},alias}} = untuplify_1([1,2], {3,4}, alias),
error = untuplify_1([1,2], {3,4}, 42),
+
+ %% Test that a previous bug in v3_codegen is gone. (The sinking of
+ %% stack frames into only the case arms that needed them was not always
+ %% safe.)
+ [33, -1, -33, 1] = untuplify_2(32, 65),
+ {33, 1, -33, -1} = untuplify_2(65, 32),
+
ok.
untuplify_1(A, B, C) ->
@@ -390,6 +397,21 @@ untuplify_1(A, B, C) ->
error
end.
+untuplify_2(V1, V2) ->
+ {D1,D2,D3,D4} =
+ if V1 > V2 ->
+ %% The 1 value was overwritten by the value of V2-V1.
+ {V1-V2, 1, V2-V1, -1};
+ true ->
+ {V2-V1, -1, V1-V2, 1}
+ end,
+ if
+ D2 > D4 ->
+ {D1, D2, D3, D4};
+ true ->
+ [D1, D2, D3, D4]
+ end.
+
%% Coverage of beam_dead:shortcut_boolean_label/4.
shortcut_boolean(Config) when is_list(Config) ->
false = shortcut_boolean_1([0]),