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Use S operands instead of s operands for a slight speed increase
and reduction in code size of process_main(). Use micro instructions
for frequently executed instructions.
While at it, use safe multiplication in gen_get_integer() in
beam_load.c.
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Let sys.h define HAVE_OVERFLOW_CHECK_BUILTINS if the compiler supports
__builtin_mul_overflow() and the other overflow checking builtins.
The test is intentionally made in a sys.h and not as a configure test.
On Windows, beam_emu.c is always compiled using gcc, but the other
files are usually compiled with Microsoft's C compiler. With the
test in the header file, HAVE_OVERFLOW_CHECK_BUILTINS will be defined
when compiling beam_emu.c.
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Starting in OTP 19 (in commit 9504c0dd71d0), the compiler emits
a test_unit instruction instead of a skip instruction at the end
of binary. We can do the same replacement in the loader to get
rid of the i_bs_skip_bits_all2 instruction.
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On a 64-bit architecture, the size of any binary that would fit in the
memory must fit in a small, so we can fail immediately if the size
term is not a small.
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The new compiler required adding support for Y register for all
binary matching instructions. That was (intentionally) done in a
naive way that simplicated duplicated the entire body of each
instruction.
Now it's time to be less naive. Rewrite the binary matching
instructions using micro instructions. Because some of the binary
instructions are huge, that will significantly decrease the size of
process_main().
When compiling with clang, a huge process_main() would mess up
profile-guide optimization resulting in a significant performance
degradation. On my Mac, profile-guide optimzation would decrease
the estone benchmark by 100K estones (about 20 percent). This commit
gives me back the lost estones.
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Mark the obsoleted instructions bs_start_match2, bs_save2, bs_restore2, and
bs_context_to_binary as cold.
Remove support of a Y operand for bs_save2 and bs_restore2.
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get_tuple_element with an Y register has become more frequent with
the new compiler.
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The compiler used to generate "move Literal y(Y)" instructions very
rarely. Therefore, there was a transformation to avoid having a "move
c y" instruction.
With the new compiler, "move Literal y(Y)" instructions are relatively frequent, so we will need a "move c y" instruction.
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* maint:
Set early enough start time
inet_db: fix a bug when .hosts file is never reloaded
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* inet_db-startup-fix:
Set early enough start time
inet_db: fix a bug when .hosts file is never reloaded
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Adhering to the review in GitHub PR #2066:
The start time should be set so the resolver file can get
re-read as soon as possible to not get the whole timeout time
before detecting that the resolver file has been created.
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* rickard/deprecations-removals:
Fix bootstrap
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* maint:
stdlib: Optimize calendar:system_time_to_rfc3339()
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* hasse/stdlib/optimize_calendar_rfc3339/OTP-15630:
stdlib: Optimize calendar:system_time_to_rfc3339()
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* siri/logger/os-timestamp/OTP-15625:
Update preloaded
[logger] Change timestamp from erlang:system_time to os:system_time
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* maint:
fixup! ssl: Add support for {active,N}
ssl: Use common fonction to update {active,N}
ssl: Document {active,N}
ssl: Add support for {active,N}
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Rewords one sentence in common_test documentation
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* essen/ssl-active-n:
fixup! ssl: Add support for {active,N}
ssl: Use common fonction to update {active,N}
ssl: Document {active,N}
ssl: Add support for {active,N}
Conflicts:
lib/ssl/src/ssl.erl
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Add application:set_env/1 and application:set_env/2
OTP-15642
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Move size=all binary clause pruning to v3_kernel
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Tune BEAM instructions for the new compiler (part 1)
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Optimize the beam_ssa_dead sub pass
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Optimize v3_kernel for thousands of clauses
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It is equivalent to calling application:set_env/4 on
each application individually, except it is more efficient.
When given duplicate apps or duplicate keys, set_env/1
and set_env/2 will warn. The warning will also be emitted
during boot:
$ erl -config dupkeys.config -s erlang halt
2019-02-27 11:16:02.653100 application: kernel; duplicate parameter: key1
=WARNING REPORT==== 27-Feb-2019::11:16:02.653100 ===
application: kernel; duplicate parameter: key1
$ erl -config dupapps.config -s erlang halt
2019-02-27 11:16:02.653100 duplicate application config: kernel
=WARNING REPORT==== 27-Feb-2019::11:16:02.653100 ===
duplicate application config: kernel
Prior to this patch, the behaviour was unspecified,
and duplicate keys and duplicate apps would behave
different depending on the amount of config, the name
of the config files, and how those configs would be
listed. The goal is to raise an error in the future.
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The advantage of moving it up is that it reduces the
size of the code emitted by v3_kernel, speeding
v3_kernel itself and beam_kernel_to_ssa pass.
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The is_nonempty_list test is very frequently followed by
get_tl, and frequently followed by get_hd.
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It turns out that the combination of is_nonempty_list
and test_heap is no longer frequent.
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The test_arity instruction is often followed by get_tuple_element.
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Prior to this patch, v3_kernel would do multiple
passes on the clauses to group them. This commit
unrolls those passes, making v3_kernel up to 10%
faster in those cases.
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This is cleaner and slightly faster.
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The general complexity of the shortcut sub pass of `beam_ssa_dead` is
quadratic, but those optimizations will reduce the constant factor
somewhat.
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Refactor the code to avoid putting any variable from a skippable block
into the set of unset variables. Keeping the set of unset variables as
small as possible will make beam_ssa_dead almost twice as fast when
compiling lib/unicode/tokenizer.ex in elixir.
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Add a quiet logger mode (default) which limits the
printouts in the (erlang) shell (the web log will
be as verbose as usual).
Also added a way to configure the runtime of the ttest
cases.
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