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| author | Björn Gustavsson <[email protected]> | 2015-01-31 08:17:25 +0100 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2015-02-03 08:40:48 +0100 |
| commit | 8c0bebb66ba01b174e6482cd81949eaf08748bcd (patch) | |
| tree | 391e0980f8d708c7668376d4cee0d03a18fbf2a1 /erts/emulator/test/trace_bif_SUITE.erl | |
| parent | c8bbf52191e3c87eedde061051eebcd02dbb7fd5 (diff) | |
| download | otp-8c0bebb66ba01b174e6482cd81949eaf08748bcd.tar.gz otp-8c0bebb66ba01b174e6482cd81949eaf08748bcd.tar.bz2 otp-8c0bebb66ba01b174e6482cd81949eaf08748bcd.zip | |
trace_bif_SUITE: Ensure that a call to time/0 is not removed
Assigning the result of a BIF call to a variable used to be
sufficient to prevent the call from being optimized away. With
the more aggressive optimization that will be introduced in
a future commit it will not be sufficient.
Matching the return value will prevent the compiler from doing
the optimization.
Diffstat (limited to 'erts/emulator/test/trace_bif_SUITE.erl')
| -rw-r--r-- | erts/emulator/test/trace_bif_SUITE.erl | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/erts/emulator/test/trace_bif_SUITE.erl b/erts/emulator/test/trace_bif_SUITE.erl index 2c78aa394f..063e348836 100644 --- a/erts/emulator/test/trace_bif_SUITE.erl +++ b/erts/emulator/test/trace_bif_SUITE.erl @@ -260,7 +260,9 @@ bif_process() -> apply(erlang, Name, Args), bif_process(); {do_time_bif} -> - _ = time(), %Assignment tells compiler to keep call. + %% Match the return value to ensure that the time() call + %% is not optimized away. + {_,_,_} = time(), bif_process(); {do_statistics_bif} -> statistics(runtime), |