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-rw-r--r--lib/compiler/src/beam_utils.erl3
-rw-r--r--lib/compiler/test/beam_utils_SUITE.erl25
2 files changed, 26 insertions, 2 deletions
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl
index 5510624b2d..30b6dcac8c 100644
--- a/lib/compiler/src/beam_utils.erl
+++ b/lib/compiler/src/beam_utils.erl
@@ -355,6 +355,9 @@ split_even(Rs) -> split_even(Rs, [], []).
%% exit BIF will raise an exception
%% used - Reg is used
+check_liveness({fr,_}, _, St) ->
+ %% Conservatively always consider the floating point register used.
+ {used,St};
check_liveness(R, [{block,Blk}|Is], St0) ->
case check_liveness_block(R, Blk, St0) of
{transparent,St1} ->
diff --git a/lib/compiler/test/beam_utils_SUITE.erl b/lib/compiler/test/beam_utils_SUITE.erl
index 3d35b546fc..dee7fb9cf9 100644
--- a/lib/compiler/test/beam_utils_SUITE.erl
+++ b/lib/compiler/test/beam_utils_SUITE.erl
@@ -25,7 +25,8 @@
is_not_killed/1,is_not_used_at/1,
select/1,y_catch/1,otp_8949_b/1,liveopt/1,coverage/1,
y_registers/1,user_predef/1,scan_f/1,cafu/1,
- receive_label/1,read_size_file_version/1,not_used/1]).
+ receive_label/1,read_size_file_version/1,not_used/1,
+ is_used_fr/1]).
-export([id/1]).
suite() -> [{ct_hooks,[ts_install_cth]}].
@@ -52,7 +53,8 @@ groups() ->
scan_f,
cafu,
read_size_file_version,
- not_used
+ not_used,
+ is_used_fr
]}].
init_per_suite(Config) ->
@@ -527,5 +529,24 @@ not_used_p(_C, S, K, L) when is_record(K, k) ->
id(K)
end.
+is_used_fr(Config) ->
+ 1 = is_used_fr(self(), self()),
+ 1 = is_used_fr(self(), other),
+ receive 1 -> ok end,
+ receive 1 -> ok end,
+ receive 1 -> ok end,
+ receive 1 -> ok end,
+ ok.
+
+is_used_fr(X, Y) ->
+ %% beam_utils:is_used({fr,R}, Code) would crash.
+ _ = 0 / (X ! 1),
+ _ = case Y of
+ X -> ok;
+ _ -> error
+ end,
+ X ! 1.
+
+
%% The identity function.
id(I) -> I.