beam_ssa_type: Fix incorrect bitstring unit determination

The compiler would treat the "Unit" of bs_init instructions as
the unit of the result instead of the required unit of the input,
causing is_binary checks to be wrongly optimized away.

1 files changed, 12 insertions, 2 deletions

diff --git a/lib/compiler/test/beam_type_SUITE.erl b/lib/compiler/test/beam_type_SUITE.erl
index 2297c2e0f5..076a604aa4 100644
--- a/lib/compiler/test/beam_type_SUITE.erl
+++ b/lib/compiler/test/beam_type_SUITE.erl
@@ -24,7 +24,7 @@
 	 integers/1,numbers/1,coverage/1,booleans/1,setelement/1,
 	 cons/1,tuple/1,record_float/1,binary_float/1,float_compare/1,
 	 arity_checks/1,elixir_binaries/1,find_best/1,
-         test_size/1,cover_lists_functions/1,list_append/1]).
+         test_size/1,cover_lists_functions/1,list_append/1,bad_binary_unit/1]).
 
 suite() -> [{ct_hooks,[ts_install_cth]}].
 
@@ -48,7 +48,8 @@ groups() ->
        find_best,
        test_size,
        cover_lists_functions,
-       list_append
+       list_append,
+       bad_binary_unit
       ]}].
 
 init_per_suite(Config) ->
@@ -508,5 +509,14 @@ list_append(_Config) ->
     hello = id([]) ++ id(hello),
     ok.
 
+%% OTP-15872: The compiler would treat the "Unit" of bs_init instructions as
+%% the unit of the result instead of the required unit of the input, causing
+%% is_binary checks to be wrongly optimized away.
+bad_binary_unit(_Config) ->
+    Bin = id(<<1,2,3>>),
+    Bitstring = <<Bin/binary,1:1>>,
+    false = is_binary(Bitstring),
+    ok.
+
 id(I) ->
     I.