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| author | Björn Gustavsson <[email protected]> | 2019-02-21 07:01:45 +0100 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2019-02-21 14:04:29 +0100 |
| commit | 03d097203b23cca5da801f25abf40218ad5ada83 (patch) | |
| tree | 70b217260b273995e2a0c2ac4ea96deb826bf7a1 /lib | |
| parent | 54df0e73b3c3d0240eedc5b1469aa89ecb8de531 (diff) | |
| download | otp-03d097203b23cca5da801f25abf40218ad5ada83.tar.gz otp-03d097203b23cca5da801f25abf40218ad5ada83.tar.bz2 otp-03d097203b23cca5da801f25abf40218ad5ada83.zip | |
beam_ssa_type: Optimize setelement with partially constant arguments
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/compiler/src/beam_ssa_type.erl | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/compiler/src/beam_ssa_type.erl b/lib/compiler/src/beam_ssa_type.erl index 5fbb679c6f..c040fb2dde 100644 --- a/lib/compiler/src/beam_ssa_type.erl +++ b/lib/compiler/src/beam_ssa_type.erl @@ -24,7 +24,7 @@ -include("beam_ssa_opt.hrl"). -import(lists, [all/2,any/2,droplast/1,foldl/3,last/1,member/2, keyfind/3,partition/2,reverse/1,reverse/2, - seq/2,sort/1]). + seq/2,sort/1,split/2]). -define(UNICODE_INT, #t_integer{elements={0,16#10FFFF}}). @@ -358,6 +358,17 @@ simplify_call(I) -> I. %% Simplify a remote call to a pure BIF. simplify_remote_call(erlang, '++', [#b_literal{val=[]},Tl], _I) -> Tl; +simplify_remote_call(erlang, setelement, + [#b_literal{val=Pos}, + #b_literal{val=Tuple}, + #b_var{}=Value], I) + when is_integer(Pos), 1 =< Pos, Pos =< tuple_size(Tuple) -> + %% Position is a literal integer and the shape of the + %% tuple is known. + Els0 = [#b_literal{val=El} || El <- tuple_to_list(Tuple)], + {Bef,[_|Aft]} = split(Pos - 1, Els0), + Els = Bef ++ [Value|Aft], + I#b_set{op=put_tuple,args=Els}; simplify_remote_call(Mod, Name, Args0, I) -> case make_literal_list(Args0) of none -> |