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authorBjörn Gustavsson <[email protected]>2015-04-18 05:53:16 +0200
committerBjörn Gustavsson <[email protected]>2015-04-22 10:14:54 +0200
commit2e2d583a49939026ec9b959f9b7941d3c2d084f2 (patch)
treefea392fcb28695b0b129c2f2de36d40377e604ed /lib/compiler/src
parent0971feb23d553bb51b04eb78fbf76c4bc19b4b93 (diff)
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Move rewriting of bs_match from beam_clean to beam_z
The actual bs_match_string instruction has four operands: bs_match_string {f,Lbl} Ctxt NumBits {string,ListOfBytes} However, v3_codegen emits a more compact representation where the bits to match are packaged in a bitstring: bs_match_string {f,Lbl} Ctxt Bitstring Currently, beam_clean:clean_labels/1 will rewrite the compact representation to the final representation. That is unfortunate since clean_labels/1 is called by beam_dead, which means that the less compact representation will be introduced long before it is actually needed by beam_asm. It will also complicate any optimizations that we might want to do. Move the rewriting of bs_match_string from beam_clean:clean_labels/1 to the beam_z pass, which is the last pass executed before beam_validator and beam_asm.
Diffstat (limited to 'lib/compiler/src')
-rw-r--r--lib/compiler/src/beam_a.erl4
-rw-r--r--lib/compiler/src/beam_clean.erl8
-rw-r--r--lib/compiler/src/beam_dead.erl4
-rw-r--r--lib/compiler/src/beam_z.erl7
4 files changed, 13 insertions, 10 deletions
diff --git a/lib/compiler/src/beam_a.erl b/lib/compiler/src/beam_a.erl
index dd7e03dd28..410f598665 100644
--- a/lib/compiler/src/beam_a.erl
+++ b/lib/compiler/src/beam_a.erl
@@ -91,6 +91,10 @@ rename_instr({bs_private_append=I,F,Sz,U,Src,Flags,Dst}) ->
{bs_init,F,{I,U,Flags},none,[Sz,Src],Dst};
rename_instr(bs_init_writable=I) ->
{bs_init,{f,0},I,1,[{x,0}],{x,0}};
+rename_instr({test,Op,F,[Ctx,Bits,{string,Str}]}) ->
+ %% When compiling from a .S file.
+ <<Bs:Bits/bits,_/bits>> = list_to_binary(Str),
+ {test,Op,F,[Ctx,Bs]};
rename_instr({put_map_assoc,Fail,S,D,R,L}) ->
{put_map,Fail,assoc,S,D,R,L};
rename_instr({put_map_exact,Fail,S,D,R,L}) ->
diff --git a/lib/compiler/src/beam_clean.erl b/lib/compiler/src/beam_clean.erl
index b68b8702e0..1d26993103 100644
--- a/lib/compiler/src/beam_clean.erl
+++ b/lib/compiler/src/beam_clean.erl
@@ -184,14 +184,6 @@ function_replace([{function,Name,Arity,Entry,Asm0}|Fs], Dict, Acc) ->
function_replace(Fs, Dict, [{function,Name,Arity,Entry,Asm}|Acc]);
function_replace([], _, Acc) -> Acc.
-replace([{test,bs_match_string=Op,{f,Lbl},[Ctx,Bin0]}|Is], Acc, D) ->
- Bits = bit_size(Bin0),
- Bin = case Bits rem 8 of
- 0 -> Bin0;
- Rem -> <<Bin0/bitstring,0:(8-Rem)>>
- end,
- I = {test,Op,{f,label(Lbl, D)},[Ctx,Bits,{string,binary_to_list(Bin)}]},
- replace(Is, [I|Acc], D);
replace([{test,Test,{f,Lbl},Ops}|Is], Acc, D) ->
replace(Is, [{test,Test,{f,label(Lbl, D)},Ops}|Acc], D);
replace([{test,Test,{f,Lbl},Live,Ops,Dst}|Is], Acc, D) ->
diff --git a/lib/compiler/src/beam_dead.erl b/lib/compiler/src/beam_dead.erl
index f4515ba2a7..adc3cebc62 100644
--- a/lib/compiler/src/beam_dead.erl
+++ b/lib/compiler/src/beam_dead.erl
@@ -459,8 +459,8 @@ count_bits_matched([{test,_,_,_,[_,Sz,U,{field_flags,_}],_}|Is], SavePoint, Bits
{integer,N} -> count_bits_matched(Is, SavePoint, Bits+N*U);
_ -> count_bits_matched(Is, SavePoint, Bits)
end;
-count_bits_matched([{test,bs_match_string,_,[_,Bits,_]}|Is], SavePoint, Bits0) ->
- count_bits_matched(Is, SavePoint, Bits0+Bits);
+count_bits_matched([{test,bs_match_string,_,[_,Bs]}|Is], SavePoint, Bits) ->
+ count_bits_matched(Is, SavePoint, Bits+bit_size(Bs));
count_bits_matched([{test,_,_,_}|Is], SavePoint, Bits) ->
count_bits_matched(Is, SavePoint, Bits);
count_bits_matched([{bs_save2,Reg,SavePoint}|_], {Reg,SavePoint}, Bits) ->
diff --git a/lib/compiler/src/beam_z.erl b/lib/compiler/src/beam_z.erl
index 0c7bef9183..47e786034d 100644
--- a/lib/compiler/src/beam_z.erl
+++ b/lib/compiler/src/beam_z.erl
@@ -74,6 +74,13 @@ undo_rename({bs_init,F,{I,Extra,U,Flags},Live,[Sz,Src],Dst}) ->
{I,F,Sz,Extra,Live,U,Src,Flags,Dst};
undo_rename({bs_init,_,bs_init_writable=I,_,_,_}) ->
I;
+undo_rename({test,bs_match_string=Op,F,[Ctx,Bin0]}) ->
+ Bits = bit_size(Bin0),
+ Bin = case Bits rem 8 of
+ 0 -> Bin0;
+ Rem -> <<Bin0/bitstring,0:(8-Rem)>>
+ end,
+ {test,Op,F,[Ctx,Bits,{string,binary_to_list(Bin)}]};
undo_rename({put_map,Fail,assoc,S,D,R,L}) ->
{put_map_assoc,Fail,S,D,R,L};
undo_rename({put_map,Fail,exact,S,D,R,L}) ->