diff options
Diffstat (limited to 'lib/compiler/src/beam_asm.erl')
| -rw-r--r-- | lib/compiler/src/beam_asm.erl | 44 |
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. |