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The idea is to use memchr on the first lookup for
binary:match/2 and also after every match on binary:matches/2.
We only use memchr in case of matches because benchmarks
showed that using memchr even when we had false positives
could negatively affect performance.
This speeds up binary matching and binary splitting by 4x
in some cases and by 70x in other scenarios (when the last
character in the needle does not occur in the subject).
The reason to use memchr is that it is highly specialized
in most modern operating systems, often defaulting to
SIMD operations.
The implementation uses the reduction count to figure out
how many bytes should be read with memchr. We could increase
those numbers but they do not seem to make a large difference.
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I did not find any legitimate use of "can not", however skipped
changing e.g RFCs archived in the source tree.
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Refactor maps.erl
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This only touches functions that are not further manually enhanced in
erl_bif_types. The hope is that this will allow dialyzer to discover
more issues in code using maps.
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maps:new/0 is no longer a BIF
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Using direct pattern matching on the map is more effient than pattern
matching on the result of maps:find/2, because it avoids allocating the
intermediate tuple.
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Optimise creation of anonymous functions
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Implementing it in Erlang allows taking advantage of the literal pool
optimisation, this means the function implemented in Erlang does no
allocations, while the BIF had to allocate new map each time it was
called. Benchmarks show the function is also slightly faster now.
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This introduces a similar optimisation for normal funs
to what was introduced for external funs in #1725.
It is possible to allocate the fun as a literal, if it does not capture
the environment (i.e. it does not close over any variables).
Unfortunately it's not possible to do this in the compiler due to
problems with representation of such functions in the `.beam` files.
Fortunately, we can do this in the loader.
Simple evaluation shows that functions that don't capture the
enviornment consistute over 60% of all funs in the source code of
Erlang/OTP itself.
The only downside is that we lose a meningful value in the `pid` field
of the fun. The goal of this field, beyond debugging, was to be
able to identify the original node of a function. To be able to still do
this, the functions that are created in the loader are assigned the init
pid as the creator.
To solve issues with staryp, initially set the `erts_init_process_id`
to `ERTS_INVALID_PID` and skip the described optimisation if the value
is still uninitialised.
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* lukas/clean_doc_xmldir/OTP-15190:
docs: make clean all XMLDIR
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* siri/logger/post-21/OTP-15132:
[logger] Allow setting kernel parameter 'logger_level' to 'all'
[kernel] Reduce risk of dead lock when terminating logger_sup
[logger] Fix regexp replacement for unicode strings
Update proc_lib:report_cb to obey logger formatter's size limiting params
[logger] Allow report callback with two arguments returning a string
Don't call report_cb from cth_log_redirect - formatter does that
Add legacy test of sasl_report_file_h and size limiting
[logger] Remove compiler warnings in test
[logger] Fix problem with test cases waiting for handler restart
[logger] Add ?LOG macro which takes Level as argument
[logger] Improve spec for set_handler_config/3 and set_primary_config/2
[logger] Generate .png file from .dia
[logger] Update documentation
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* maint:
Updated OTP version
Update release notes
Update version numbers
Eliminate a crash in the beam_jump pass
stdlib: Fix a 'chars_limit' bug
Fix a race condition when generating async operation ids
Fix internal compiler error for map_get/2
beam_type: Fix unsafe optimization
public_key: Remove moduli 5121 and 7167 Thoose were added by 598629aeba9de98e8cdf5637043eb34e5d407751 but are not universaly supported.
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* maint-21:
Updated OTP version
Update release notes
Update version numbers
Eliminate a crash in the beam_jump pass
stdlib: Fix a 'chars_limit' bug
Fix a race condition when generating async operation ids
Fix internal compiler error for map_get/2
beam_type: Fix unsafe optimization
public_key: Remove moduli 5121 and 7167 Thoose were added by 598629aeba9de98e8cdf5637043eb34e5d407751 but are not universaly supported.
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jhogberg/john/erts/cross-type-carrier-migration/OTP-15063
Allow carrier migration between different allocator types
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* maint:
Fix typo in erl_parse type unary_op()
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Fix typo in erl_parse type unary_op()
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Use erlang:system_info(ets_count) and improve docs
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* maint:
stdlib: Add a few uses of erl_anno
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uri_string: support key without value in query string
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With DEBUG=true in erl_anno, erl_parse, and erl_pp a few (harmless)
non-opaque accesses of annotations were found.
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* raimo/stdlib/gen_statem-dev/OTP-14015:
Show state changes in sys:trace
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* peterdmv/stdlib/fix_uri_string_normalize/ERL-636/OTP-15112:
stdlib: Fix release_tests target in Makefile
stdlib: Fix normalization function in uri_string
Change-Id: I656a583befd8950d4326d15e60145c617acd41c3
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'make release_tests' copies the property_test directory.
Change-Id: Ife75711aec1ef6e85ef091b1ba28a221be3d1110
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* jl/sharpen-maps-tests/OTP-14012:
stdlib: Fix error reason for maps:with/without
Check for the overlap between maps and iterators
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- Fix parsing of hostnames that start with a number.
- Update uri_string:parse/1 to be only responsible for parsing
input URIs into URI components. Implicit percent-encoding
normalization has been removed.
- Implement percent-encoding normalization.
- Update uri_string:normalize/{1,2} to include percent-encoding
normalization.
- Update test suites according to the new semantics.
- Add new property test: normalize
Change-Id: I6f37dcae2b3fcb4b29d286dbb0dfc563e8f211ae
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* hasse/stdlib/pP_with_no_line_breaks/OTP-15103/ERL-607:
kernel: Use ~0p
debugger: Use ~0p
common_test: Use ~0p
stdlib: Make pP insert no line breaks with field width zero
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Module and Id are now always included as fields in Config, so these
are no longer returned as separate elements.
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And add field 'module' in handler config.
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See also https://bugs.erlang.org/browse/ERL-634.
The utility program `erl_call' in erl_interface used to call
lib:eval_str/1, which is no longer present in Erlang/OTP 21.0.
The lib module was eliminated in OTP-15072, see also
https://github.com/erlang/otp/pull/1786.
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See also https://bugs.erlang.org/browse/ERL-607.
A zero field width used to insert line breaks "everywhere", but with
this patch no line breaks are inserted.
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* dgud/stdlib/string-case-bin-bug:
Fix *case bugs for binaries
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