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-rw-r--r--lib/compiler/src/beam_asm.erl44
1 files changed, 17 insertions, 27 deletions
diff --git a/lib/compiler/src/beam_asm.erl b/lib/compiler/src/beam_asm.erl
index 084686def7..73694b96ce 100644
--- a/lib/compiler/src/beam_asm.erl
+++ b/lib/compiler/src/beam_asm.erl
@@ -431,45 +431,35 @@ encode_alloc_list_1([], Dict, Acc) ->
{iolist_to_binary(Acc),Dict}.
encode(Tag, N) when N < 0 ->
- encode1(Tag, negative_to_bytes(N, []));
+ encode1(Tag, negative_to_bytes(N));
encode(Tag, N) when N < 16 ->
(N bsl 4) bor Tag;
encode(Tag, N) when N < 16#800 ->
[((N bsr 3) band 2#11100000) bor Tag bor 2#00001000, N band 16#ff];
encode(Tag, N) ->
- encode1(Tag, to_bytes(N, [])).
+ encode1(Tag, to_bytes(N)).
encode1(Tag, Bytes) ->
- case length(Bytes) of
+ case iolist_size(Bytes) of
Num when 2 =< Num, Num =< 8 ->
[((Num-2) bsl 5) bor 2#00011000 bor Tag| Bytes];
Num when 8 < Num ->
[2#11111000 bor Tag, encode(?tag_u, Num-9)| Bytes]
end.
-
-to_bytes(N0, Acc) ->
- Bits = 3*128,
- case N0 bsr Bits of
- 0 ->
- to_bytes_1(N0, Acc);
- N ->
- to_bytes(N, binary_to_list(<<N0:Bits>>) ++ Acc)
- end.
-
-to_bytes_1(0, [B|_]=Done) when B < 128 -> Done;
-to_bytes_1(N, Acc) -> to_bytes(N bsr 8, [N band 16#ff|Acc]).
-
-negative_to_bytes(N0, Acc) ->
- Bits = 3*128,
- case N0 bsr Bits of
- -1 ->
- negative_to_bytes_1(N0, Acc);
- N ->
- negative_to_bytes_1(N, binary_to_list(<<N0:Bits>>) ++ Acc)
+to_bytes(N) ->
+ Bin = binary:encode_unsigned(N),
+ case Bin of
+ <<0:1,_/bits>> -> Bin;
+ <<1:1,_/bits>> -> [0,Bin]
end.
-negative_to_bytes_1(-1, [B1,_B2|_]=Done) when B1 > 127 ->
- Done;
-negative_to_bytes_1(N, Acc) ->
- negative_to_bytes_1(N bsr 8, [N band 16#ff|Acc]).
+negative_to_bytes(N) when N >= -16#8000 ->
+ <<N:16>>;
+negative_to_bytes(N) ->
+ Bytes = byte_size(binary:encode_unsigned(-N)),
+ Bin = <<N:Bytes/unit:8>>,
+ case Bin of
+ <<0:1,_/bits>> -> [16#ff,Bin];
+ <<1:1,_/bits>> -> Bin
+ end.