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| author | Björn Gustavsson <[email protected]> | 2011-04-11 12:15:09 +0200 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2011-04-12 05:52:58 +0200 |
| commit | 981acf6eaa48adffb27b2e812db8bcd180121f4e (patch) | |
| tree | 047b0d679ce69e26d933d35252393e06247c10f3 | |
| parent | ce34176deaffd219e921cb70f271bbc693061fb6 (diff) | |
| download | otp-981acf6eaa48adffb27b2e812db8bcd180121f4e.tar.gz otp-981acf6eaa48adffb27b2e812db8bcd180121f4e.tar.bz2 otp-981acf6eaa48adffb27b2e812db8bcd180121f4e.zip | |
beam_dead: Remove uncovered clauses in binary matching optimization
In the optimization of binary matching, it seems that two clauses
cannot never be reached. Removing the clauses is safe, since that
would only mean that an opportunity for an optimization is lost
| -rw-r--r-- | lib/compiler/src/beam_dead.erl | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/lib/compiler/src/beam_dead.erl b/lib/compiler/src/beam_dead.erl index 0afb027d3a..73f45452fa 100644 --- a/lib/compiler/src/beam_dead.erl +++ b/lib/compiler/src/beam_dead.erl @@ -592,16 +592,11 @@ count_bits_matched([{test,_,_,_}|Is], SavePoint, Bits) -> count_bits_matched([{bs_save2,Reg,SavePoint}|_], {Reg,SavePoint}, Bits) -> %% The save point we are looking for - we are done. Bits; -count_bits_matched([{bs_save2,_,_}|Is], SavePoint, Bits) -> - %% Another save point - keep counting. - count_bits_matched(Is, SavePoint, Bits); count_bits_matched([_|_], _, Bits) -> Bits. shortcut_bs_pos_used(To, Reg, D) -> shortcut_bs_pos_used_1(beam_utils:code_at(To, D), Reg, D). -shortcut_bs_pos_used_1([{bs_restore2,Reg,_}|_], Reg, _) -> - false; shortcut_bs_pos_used_1([{bs_context_to_binary,Reg}|_], Reg, _) -> false; shortcut_bs_pos_used_1(Is, Reg, D) -> |