Merge branch 'bjorn/compiler/misc'

* bjorn/compiler/misc:
  test_lib: Simplify uniq/0
  beam_dict: Correct comparison in opcode/2
  beam_utils: Re-use the local helper function drop_labels/1
  beam_asm: Speed up encoding of large numbers
  compilation_SUITE: Speed up the self_compile test cases
  beam_listing: Optimize writing of .S files
  v3_core, v3_codegen: Eliminate old-style catches
  cerl_inline: Replace old-style 'catch' with 'try'...'catch'
  sys_core_fold: Suppress warnings better
  beam_utils: Teach check_liveness/3 to understand get_map_elements
  Teach beam_trim to handle map instructions
  beam_utils: Be less conservative about liveness for exit instructions
  beam_validator: Stop validating the 'aligned' flag for binaries
  beam_validator: Clean up updating of types for y register
  beam_validator: Remove support for removed BIF fault/1,2
  beam_validator: Correct merging of states
  beam_validator: Correct merging of y registers
  sys_pre_expand: Remove unused fields in #expand{} record

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.