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The compiler could sometimes emit unnecessary 'move'
instructions in the code for binary matching, for
example for this function:
escape(<<Byte, Rest/bits>>, Pos) when Byte >= 127 ->
escape(Rest, Pos + 1);
escape(<<Byte, Rest/bits>>, Pos) ->
escape(Rest, Pos + Byte);
escape(<<_Rest/bits>>, Pos) ->
Pos.
The generated code would look like this:
{function, escape, 2, 2}.
{label,1}.
{line,[{location,"t.erl",17}]}.
{func_info,{atom,t},{atom,escape},2}.
{label,2}.
{test,bs_start_match2,{f,1},2,[{x,0},0],{x,0}}.
{test,bs_get_integer2,
{f,4},
2,
[{x,0},
{integer,8},
1,
{field_flags,[{anno,[17,{file,"t.erl"}]},unsigned,big]}],
{x,2}}.
{'%',{bin_opt,[17,{file,"t.erl"}]}}.
{move,{x,0},{x,3}}. %% UNECESSARY!
{test,is_ge,{f,3},[{x,2},{integer,127}]}.
{line,[{location,"t.erl",18}]}.
{gc_bif,'+',{f,0},4,[{x,1},{integer,1}],{x,1}}.
{move,{x,3},{x,0}}. %% UNECESSARY!
{call_only,2,{f,2}}.
{label,3}.
{line,[{location,"t.erl",20}]}.
{gc_bif,'+',{f,0},4,[{x,1},{x,2}],{x,1}}.
{move,{x,3},{x,0}}. %% UNECESSARY!
{call_only,2,{f,2}}.
{label,4}.
{move,{x,1},{x,0}}.
return.
The redundant 'move' instructions have been marked.
To avoid the 'move' instructions, we can extend the existing
function is_context_unused/1 in v3_codegen. If v3_codegen can
know that the match context will not be used again, it can reuse
the register for the match context and avoid the extra 'move'
instructions.
https://bugs.erlang.org/browse/ERL-444
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* maint:
Make handling of match contexts stricter
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Make handling of match contexts stricter
OTP-14591
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* maint:
Always reply to sync requests
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* dgud/kernel/fix-hanging-io/OTP-14571:
Always reply to sync requests
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Enhance optimisations in beam_peep
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beam_validator could fail issue a diagnostic when a register
that was supposed to be a match context was not guaranteed to
be a match context.
The bug was in merging of types. Merging of a match context with
another term would result in a match context. That is wrong. Merging
should produce a more general type, not a narrower type. Also, the
valid slots in two match contexts should be combined with 'band', not
'bor'.
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* anders/diameter/config_consistency/OTP-14555:
Let strict_mbit and incoming_maxlen be configured per transport
Let a service configure default transport options
Rename type evaluable -> eval
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* anders/diameter/upgrade/OTP-14552:
Fix compatibility of remote send
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* anders/diameter/strict_capx/OTP-14546:
Document transport_opt() strict_capx
Rename transport_opt() capx_strictness to strict_capx
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* anders/diameter/performance/OTP-14521:
Fix influence of decode_format on service events
Work around more common_test woe
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* anders/diameter/loopback_any/OTP-14544:
Use loopback/any config in examples suite
Handle loopback/any as local address in diameter_tcp/sctp
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* anders/diameter/codec/OTP-14511:
Use map decoding in example client
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* anders/diameter/caseless/OTP-14535:
Replace calls to inet_parse(3)
Fix regexp match of accept tuple in diameter_tcp/sctp
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Remove query keyword residues
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Otherwise processes doing io could get stuck.
See ERL-472.
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Decoded CER/CEA messages are passed in events messages that can be
subscribed to using diameter:subscribe/1. A configured decode_format was
not reflected in these, messages always being passed as records.
Clarify that strict_arities only applies to message callbacks.
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Conflicts:
erts/emulator/beam/bif.c
erts/emulator/beam/dist.c
erts/emulator/beam/dist.h
erts/emulator/beam/erl_bif_info.c
erts/emulator/beam/erl_node_tables.c
erts/emulator/beam/erl_node_tables.h
erts/emulator/beam/external.c
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When cleaning selects, it might happen we're left with only one pair. In such
case convert to a regular test + jump.
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query was no longer a keyword since the commit 0dc3a29744bed0b7f483ad72e19773dc0982ea50 2012-11-19.
So the quotes around query, when it used as atom, no needed.
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* maint-20:
Updated OTP version
Prepare release
dialyzer: Fix a bug where merging PLT:s could lose info
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Since these can make sense per peer. The remaining service-only options
either belong there or make little sense being configured per transport.
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Only a default spawn_opt has been possible to configure, but there's
no reason why most others should need to be configured per transport.
Those options that still only make sense on a transport are
transport_module/config (because of the semantics of multiple values),
applications/capabilities (since these override service options), and
private (since it's only to allow user-specific options in a backwards
compatible way).
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* maint:
Fix disksup:get_disksup_data() for High Sierra
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Fix disksup:get_disksup_data() for High Sierra
OTP-14560
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When sampling multiple processes and analyzing with totals true sum
together all caller and callee entries which concerns the same
function. Previous behaviour was to report each contributing entry.
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Export the old type as a synonym for backwards compatability. The name
evaluable is a bit too awkward.
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To follow the naming of options like strict_mbit and more. Still accept
capx_strictness since this is known to be used.
Introduced in commit e4f28f3b.
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* maint:
Emacs: Fix default target for xref-find-references
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Emacs: Fix default target for xref-find-references
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* ingela/ssl/dtls-alert-handling/OTP-14078:
dtls: Customize alert handling for DTLS over UDP
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A missing call to ets:safe_fixtable/2 meant that information
was sometimes lost when merging PLT:s.
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* ingela/ssl/tls-vs-dtls-version:
ssl: DTLS packet support
ssl: Enable dtls tests
ssl: Adjust ALPN and next protocol to work with DTLS
ssl: Enable more DTLS tests
ssl: negotiated_hashsign/4 expects TLS version to function correctly
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Test that DTLS handles "high" level packet types as http-packet types.
Low level packet type as {packet, 2} we will consider later if they
should be relevant to support or not.
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Conflicts:
OTP_VERSION
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* maint-20:
Updated OTP version
Prepare release
Accept non-binary options as socket-options
Bump version
Fix broken handling of default values in extensions for PER
compiler: Fix live regs update on allocate in validator
Take fail labels into account when determining liveness in block ops
Check for overflow when appending binaries, and error out with system_limit
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The default target is changed to be just the name at point when
xref-find-references is invoked. Previously the default was the same
as for xref-find-definitions. This included arity and other things
that do not make sense for xref-find-references.
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By changing the definition of the request record, commit f489c0d5 broke
sending an outgoing request over a peer connection terminated on a
remote node running an older version of diameter. The modified fields
aren't even used on the remote node, so simply reintroduce one of the
fields so that the size of the tuple is unchanged.
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Also run this suit on all TLS versions
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