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Here is an example of a move instruction that could not be optimized
away because the {x,2} register was not killed:
get_tuple_element Reg Pos {x,2}
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.
.
move {x,2} {y,0}
put_list {x,2} nil Any
We can do the optimization if we replace all occurrences of the {x,2}
register as a source with {y,0}:
get_tuple_element Reg Pos {y,0}
.
.
.
put_list {y,0} nil Dst
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The 'move' optimization was relatively clean until GC BIFs
were introduced. Instead of re-thinking the implementation,
the existing code was fixed and patched.
The current code unsuccessfully attempts to eliminate 'move'
instructions across GC BIF and allocation instructions. We can
simplify the code if we give up as soon as we encounter any
instruction that allocates.
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opt_alloc/1 makes a redundant call to opt/1. It is redundant because
the opt/1 function has already been applied to the instruction
sequence prior to calling opt_alloc/1.
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Thanks to ILYA Khlopotov for pointing the bug out.
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* maint:
stdlib: fix a qlc bug introduced in 18.0
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* hb/stdlib/fix_qlc_bug/OTP-12946:
stdlib: fix a qlc bug introduced in 18.0
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As pointed out by roowe, qlc does not handle errors in early compiler
(scanner, parser) well in OTP 18.0.
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Conflicts:
OTP_VERSION
erts/vsn.mk
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* ia/ssl/doc/duplicate:
ssl: Remove duplicate documentation
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Correct merge that went wrong.
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* maint:
dialyzer: Fix a bug concerning parameterized opaque types
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* hb/dialyzer/bugfix_opaque_parms/OTP-12940:
dialyzer: Fix a bug concerning parameterized opaque types
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The example is provided by James Fish in
http://erlang.org/pipermail/erlang-questions/2014-December/082204.html.
Note that warnings with text such as "the _ variable breaks
opaqueness" are still possible.
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* maint:
erts: Make sure to unlock status lock when setting process prio
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* lukas/erts/process_priority_unlock/OTP-12943:
erts: Make sure to unlock status lock when setting process prio
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* vinoski/stderr-eagain/OTP-12942:
Handle ERRNO_BLOCK in fd_driver async functions
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* lukas/erts/fix_ttsl_binary_leak/OTP-12941:
erts: Fix binary memory leak in ttsl driver
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Several users on erlang-questions have reported problems with recent
releases where output to standard_error causes standard_error_sup to
die from receiving an unexpected eagain error. In the fd_driver,
change the fd_async() function to handle EINTR, and change
fd_ready_async() to handle ERRNO_BLOCK. Add a new test to
standard_error_SUITE to generate output to standard_error and ensure
that standard_error_sup does not die. Thanks to Kota Uenishi for
contributing the test case.
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* maint:
dialyzer: Use the recently added orddict:orddict/2 type
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* maint:
ssh: ct:pal -> ct:log in lib/ssh/test
ssh: ssh_trpt_test_lib improvments
ssh: Unicode test improvments
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* hans/ssh/cuddle_tests:
ssh: ct:pal -> ct:log in lib/ssh/test
ssh: ssh_trpt_test_lib improvments
ssh: Unicode test improvments
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Did not work on windows, on windows getItem uses wxLogWindow instead
of assert in case of out of range, so the test still caused a log window.
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Too much code was removed in commit 560f73141af
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Broken in the parent commit.
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The diffs are all about adapting to the OTP 18 time interface. The code
was previously backwards compatible, falling back on the erlang:now/0 if
erlang:monotonic_time/0 is unavailable, but this was seen to be a bad
thing in commit 9c0f2f2c. Use of erlang:now/0 is now removed.
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OTP-12935
* sstrigler/fix-port-timeout:
add test for odbc port_timeout
add doc for odbc port_timeout
introduce odbc port_timeout
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* anders/diameter/17.5.6.3/OTP-12927:
vsn -> 1.9.2.1
Update appup for 17.5.6.3
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* anders/diameter/17/time/OTP-12926:
Simplify time manipulation
Remove use of monotonic time in pre-18 code
Remove unnecessary redefinition of erlang:max/2
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* anders/diameter/grouped_errors/OTP-12930:
Fix decode of Grouped AVPs containing errors
Simplify logic
Simplify logic
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* anders/diameter/transport/OTP-12929:
Fix start order of alternate transports
Log discarded answers
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* anders/diameter/lcnt/OTP-12912:
Make ets diameter_stats a set
Remove unnecessary sorting in stats suite
Set ets {write_concurrency, true} on diameter_stats
Don't start watchdog timers unnecessarily
Remove unnecessary erlang:monitor/2 qualification
Add missing watchdog suite clause
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* anders/diameter/caseless/OTP-12902:
Match allowable peer addresses case insensitively
Replace calls to module inet_parse to equivalents in inet
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* anders/diameter/grouped_decode/OTP-12879:
Fix relay encode of decoded diameter_avp lists
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* anders/diameter/decode/OTP-12891:
Don't compute AVP list length unnecessarily at AVP decode
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* anders/diameter/decode/OTP-12871:
Don't traverse errors list unnecessarily when detecting missing AVPs
Don't flag AVP as missing as a consequence of decode error
Correct inaccurate doc
Truncate potentially large terms passed to diameter_lib:log/4
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* toraritte/patch-1:
Fix function reference (no first/2 in ets)
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* ericmj/patch-1:
Fix formatting of depth option
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