diff options
Diffstat (limited to 'lib/compiler/src/beam_utils.erl')
| -rw-r--r-- | lib/compiler/src/beam_utils.erl | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl index 8ca368c167..26020e1d29 100644 --- a/lib/compiler/src/beam_utils.erl +++ b/lib/compiler/src/beam_utils.erl @@ -26,6 +26,8 @@ code_at/2,bif_to_test/3,is_pure_test/1, live_opt/1,delete_live_annos/1,combine_heap_needs/2]). +-export([join_even/2,split_even/1]). + -import(lists, [member/2,sort/1,reverse/1,splitwith/2]). -record(live, @@ -756,13 +758,9 @@ live_opt([{line,_}=I|Is], Regs, D, Acc) -> live_opt(Is, Regs, D, [I|Acc]); %% The following instructions can occur if the "compilation" has been -%% started from a .S file using the 'asm' option. +%% started from a .S file using the 'from_asm' option. live_opt([{trim,_,_}=I|Is], Regs, D, Acc) -> live_opt(Is, Regs, D, [I|Acc]); -live_opt([{allocate,_,Live}=I|Is], _, D, Acc) -> - live_opt(Is, live_call(Live), D, [I|Acc]); -live_opt([{allocate_heap,_,_,Live}=I|Is], _, D, Acc) -> - live_opt(Is, live_call(Live), D, [I|Acc]); live_opt([{'%',_}=I|Is], Regs, D, Acc) -> live_opt(Is, Regs, D, [I|Acc]); live_opt([{recv_set,_}=I|Is], Regs, D, Acc) -> @@ -832,3 +830,15 @@ x_live([_|Rs], Regs) -> x_live(Rs, Regs); x_live([], Regs) -> Regs. is_live(X, Regs) -> ((Regs bsr X) band 1) =:= 1. + +%% split_even/1 +%% [1,2,3,4,5,6] -> {[1,3,5],[2,4,6]} +split_even(Rs) -> split_even(Rs,[],[]). +split_even([],Ss,Ds) -> {reverse(Ss),reverse(Ds)}; +split_even([S,D|Rs],Ss,Ds) -> + split_even(Rs,[S|Ss],[D|Ds]). + +%% join_even/1 +%% {[1,3,5],[2,4,6]} -> [1,2,3,4,5,6] +join_even([],[]) -> []; +join_even([S|Ss],[D|Ds]) -> [S,D|join_even(Ss,Ds)]. |