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| author | Björn Gustavsson <[email protected]> | 2011-02-20 12:05:00 +0100 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2011-08-16 08:58:51 +0200 |
| commit | 3347602be3c8a8bad3652c10e1e2db01315269e3 (patch) | |
| tree | f586a485986891dc01ac4dc6cb093c7d93d2907c | |
| parent | bc8be0481586782f8dcf3781b74aff78079caa11 (diff) | |
| download | otp-3347602be3c8a8bad3652c10e1e2db01315269e3.tar.gz otp-3347602be3c8a8bad3652c10e1e2db01315269e3.tar.bz2 otp-3347602be3c8a8bad3652c10e1e2db01315269e3.zip | |
ops.tab: Remove line instructions before tail-recursive calls
| -rw-r--r-- | erts/emulator/beam/ops.tab | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/erts/emulator/beam/ops.tab b/erts/emulator/beam/ops.tab index 503a0aecb5..538f0b94af 100644 --- a/erts/emulator/beam/ops.tab +++ b/erts/emulator/beam/ops.tab @@ -102,14 +102,26 @@ return move S r | line Loc | call_ext Ar Func => \ line Loc | move S r | call_ext Ar Func -move S r | line Loc | call_ext_last Ar Func D => \ +move S r | line Loc | call_ext_last Ar Func=u$is_bif D => \ line Loc | move S r | call_ext_last Ar Func D -move S r | line Loc | call_ext_only Ar Func => \ +move S r | line Loc | call_ext_only Ar Func=u$is_bif => \ line Loc | move S r | call_ext_only Ar Func - move S r | line Loc | call Ar Func => \ line Loc | move S r | call Ar Func +# +# A tail-recursive call to an external function (non-BIF) will +# never be saved on the stack, so there is no reason to keep +# the line instruction. (The compiler did not remove the line +# instruction because it cannot tell the difference between +# BIFs and ordinary Erlang functions.) +# + +line Loc | call_ext_last Ar Func=u$is_not_bif D => \ + call_ext_last Ar Func D +line Loc | call_ext_only Ar Func=u$is_not_bif => \ + call_ext_only Ar Func + line Loc | func_info M F A => func_info M F A | line Loc line I |