diff options
Diffstat (limited to 'lib/compiler/src/beam_ssa_codegen.erl')
-rw-r--r-- | lib/compiler/src/beam_ssa_codegen.erl | 44 |
1 files changed, 36 insertions, 8 deletions
diff --git a/lib/compiler/src/beam_ssa_codegen.erl b/lib/compiler/src/beam_ssa_codegen.erl index cae9920f40..142df5192f 100644 --- a/lib/compiler/src/beam_ssa_codegen.erl +++ b/lib/compiler/src/beam_ssa_codegen.erl @@ -218,7 +218,7 @@ need_heap_never(_) -> false. need_heap_blks([{L,#cg_blk{is=Is0}=Blk0}|Bs], H0, Acc) -> {Is1,H1} = need_heap_is(reverse(Is0), H0, []), - {Ns,H} = need_heap_terminator(Bs, H1), + {Ns,H} = need_heap_terminator(Bs, L, H1), Is = Ns ++ Is1, Blk = Blk0#cg_blk{is=Is}, need_heap_blks(Bs, H, [{L,Blk}|Acc]); @@ -228,6 +228,13 @@ need_heap_blks([], H, Acc) -> need_heap_is([#cg_alloc{words=Words}=Alloc0|Is], N, Acc) -> Alloc = Alloc0#cg_alloc{words=add_heap_words(N, Words)}, need_heap_is(Is, #need{}, [Alloc|Acc]); +need_heap_is([#cg_set{anno=Anno,op=bs_init}=I0|Is], N, Acc) -> + Alloc = case need_heap_need(N) of + [#cg_alloc{words=Need}] -> alloc(Need); + [] -> 0 + end, + I = I0#cg_set{anno=Anno#{alloc=>Alloc}}, + need_heap_is(Is, #need{}, [I|Acc]); need_heap_is([#cg_set{op=Op,args=Args}=I|Is], N, Acc) -> case classify_heap_need(Op, Args) of {put,Words} -> @@ -243,11 +250,31 @@ need_heap_is([#cg_set{op=Op,args=Args}=I|Is], N, Acc) -> need_heap_is([], N, Acc) -> {Acc,N}. -need_heap_terminator([{_,#cg_blk{last=#cg_br{succ=Same,fail=Same}}}|_], N) -> +need_heap_terminator([{_,#cg_blk{last=#cg_br{succ=L,fail=L}}}|_], L, N) -> + %% Fallthrough. {[],N}; -need_heap_terminator([{_,#cg_blk{}}|_], N) -> +need_heap_terminator([{_,#cg_blk{is=Is,last=#cg_br{succ=L}}}|_], L, N) -> + case need_heap_need(N) of + [] -> + {[],#need{}}; + [_|_]=Alloc -> + %% If the preceding instructions are a binary construction, + %% hoist the allocation and incorporate into the bs_init + %% instruction. + case reverse(Is) of + [#cg_set{op=succeeded},#cg_set{op=bs_init}|_] -> + {[],N}; + [#cg_set{op=bs_put}|_] -> + {[],N}; + _ -> + %% Not binary construction. Must emit an allocation + %% instruction in this block. + {Alloc,#need{}} + end + end; +need_heap_terminator([{_,#cg_blk{}}|_], _, N) -> {need_heap_need(N),#need{}}; -need_heap_terminator([], H) -> +need_heap_terminator([], _, H) -> {need_heap_need(H),#need{}}. need_heap_need(#need{h=0,f=0}) -> []; @@ -1022,12 +1049,13 @@ cg_block([#cg_set{op=bs_init,dst=Dst0,args=Args0,anno=Anno}=I, #cg_set{op=succeeded,dst=Bool}], {Bool,Fail0}, St) -> Fail = bif_fail(Fail0), Line = line(Anno), + Alloc = map_get(alloc, Anno), [#b_literal{val=Kind}|Args1] = Args0, case Kind of new -> [Dst,Size,{integer,Unit}] = beam_args([Dst0|Args1], St), Live = get_live(I), - {[Line|cg_bs_init(Dst, Size, Unit, Live, Fail)],St}; + {[Line|cg_bs_init(Dst, Size, Alloc, Unit, Live, Fail)],St}; private_append -> [Dst,Src,Bits,{integer,Unit}] = beam_args([Dst0|Args1], St), Flags = {field_flags,[]}, @@ -1037,7 +1065,7 @@ cg_block([#cg_set{op=bs_init,dst=Dst0,args=Args0,anno=Anno}=I, [Dst,Src,Bits,{integer,Unit}] = beam_args([Dst0|Args1], St), Flags = {field_flags,[]}, Live = get_live(I), - Is = [Line,{bs_append,Fail,Bits,0,Live,Unit,Src,Flags,Dst}], + Is = [Line,{bs_append,Fail,Bits,Alloc,Live,Unit,Src,Flags,Dst}], {Is,St} end; cg_block([#cg_set{anno=Anno,op=bs_start_match,dst=Ctx0,args=[Bin0]}=I, @@ -1531,13 +1559,13 @@ cg_bs_put(Fail, [{atom,Type},{literal,Flags}|Args]) -> [{Op,Fail,{field_flags,Flags},Src}] end. -cg_bs_init(Dst, Size0, Unit, Live, Fail) -> +cg_bs_init(Dst, Size0, Alloc, Unit, Live, Fail) -> Op = case Unit of 1 -> bs_init_bits; 8 -> bs_init2 end, Size = cg_bs_init_size(Size0), - [{Op,Fail,Size,0,Live,{field_flags,[]},Dst}]. + [{Op,Fail,Size,Alloc,Live,{field_flags,[]},Dst}]. cg_bs_init_size({x,_}=R) -> R; cg_bs_init_size({y,_}=R) -> R; |