diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/compiler/src/beam_asm.erl | 44 | ||||
| -rw-r--r-- | lib/compiler/test/misc_SUITE.erl | 20 |
2 files changed, 30 insertions, 34 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. diff --git a/lib/compiler/test/misc_SUITE.erl b/lib/compiler/test/misc_SUITE.erl index 68a31f14d5..f3b92aad5b 100644 --- a/lib/compiler/test/misc_SUITE.erl +++ b/lib/compiler/test/misc_SUITE.erl @@ -338,8 +338,16 @@ integer_encoding_1(Config) -> ?line do_integer_encoding(-(id(1) bsl 10000), Src, Data), ?line do_integer_encoding(id(1) bsl 10000, Src, Data), - ?line do_integer_encoding(2048, 0, Src, Data), - + do_integer_encoding(1024, 0, Src, Data), + _ = [begin + B = 1 bsl I, + do_integer_encoding(-B-1, Src, Data), + do_integer_encoding(-B, Src, Data), + do_integer_encoding(-B+1, Src, Data), + do_integer_encoding(B-1, Src, Data), + do_integer_encoding(B, Src, Data), + do_integer_encoding(B+1, Src, Data) + end || I <- lists:seq(1, 128)], io:put_chars(Src, "Last].\n\n"), ?line ok = file:close(Src), io:put_chars(Data, "0].\n\n"), @@ -372,11 +380,9 @@ do_integer_encoding(N, I0, Src, Data) -> do_integer_encoding(I, Src, Data) -> Str = integer_to_list(I), - io:put_chars(Src, Str), - io:put_chars(Src, ", \n"), - io:put_chars(Data, Str), - io:put_chars(Data, ", \n"). - + io:put_chars(Src, [Str,",\n"]), + io:put_chars(Data, [Str,",\n"]). + id(I) -> I. |