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With the introduction of immediate adds encoded as 'LEA' on x86, it is
now possible to do a fixnum add in two instructions and one branch by
commuting the addition and reusing the result register as a temporary,
which makes the 'alub' a 2-address add, saving a move instruction.
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It seems that most 3-address adds of temps can be move coalesced.
Therefore, we limit the behaviour added by 1567585dda8 to only affect
immediate adds.
Also, add conversion of immediate mov+sub to lea.
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Although LEA is useful for three-address form adds, sometimes it is used
where a normal add would have sufficed (due to the addition being the
last use of one of the operands; but RTL lowering does not know that as
it does not have liveness information). As a workaround, we convert LEA
back to ADD when the destination is the same as one of the operands.
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branch and alub overlap in their use cases, but the backends rely on
knowing that the result is unused in their lowering of branch. By
extending alub so that the destination is optional, it can fully replace
branch.
This simplifies rtl by reducing code duplication and the number of
instructions.
Also, in the x86 and arm backends, we can now use 'test' and
{'tst','mvn','teq'} to lower some alubs without destinations. This is
particularly good for x86, as sequences such as 'is_boxed' type tests
now get shorter (both from not needing a mov to copy the variable, but
also from the fact that 'testb' encodes shorter than 'andq').
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* siri/appups-20.0:
Update sasl/test/test_lib.hrl with recent versions of kernel and stdlib
Update appups in kernel, stdlib and sasl for OTP-20
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* tsloughter/mod_app/PR-1222/OTP-14029:
Accept default value of 'start_phases' and 'mod' in .app
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* bjorn/compiler/tests:
guard_SUITE: Add more test of guards
compile_SUITE: Smoke test and cover more of v3_kernel_pp
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* peppe/common_test/fix_default_gl/ERL-279/OTP-13973:
Fix problem with printouts to incorrect parent group leader
OTP-13973
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# Conflicts:
# lib/hipe/llvm/hipe_rtl_to_llvm.erl
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* margnus1/hipe_llvm39_bugs/PR-1237:
hipe_rtl_to_llvm: Constants for bits per byte/word
hipe_llvm: Work around LLVM 3.9 sdesc bug
hipe_llvm: Fix incorrect atom alignment assumption
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ECC certs should preferably use SHA2, this is what we want to be
testing. Also assembling of all available test suites must consider TLS version.
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The default value of 'mod' is '[]' and 'start_phases' is 'undefined'
in .app, but this value was not accepted if given in
the .app file. This is now corrected.
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* ingela/ssl/tune-timeouts-packet_SUITE:
ssl: Change to more modest timeouts
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* ingela/ssl/ECC-faulty-workaround:
ssl: Remove faulty workaround
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We where never really satisfied with this workaround it was
a bit far fetched, so we are pleased to be able to remove it.
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'gomoripeti/kernel/controlling_proc_badarg_doc/PR-1208/OTP-14022' into maint
* gomoripeti/kernel/controlling_proc_badarg_doc/PR-1208/OTP-14022:
controlling_process can return {error, badarg}
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The constant ?WORD_WIDTH is renamed ?BITS_IN_WORD, and a new constant
?BITS_IN_BYTE is introduced.
Additionally, a bug in a currently unused case clause of
llvm_type_from_size/1 is fixed (the size of a word was hardcoded to 64
bits).
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* raimo/gen_statem-improvements/OTP-13929:
Log terminate to sys debug
Optimize event timeout
Rework timeout handling
Clarify the chapter 'Postponing Events' (ERL-284)
Fix doc and type for state enter calls
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* jxck/fix-doc-typo/PR-1238:
fix typo on doc of maps
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* richcarl/mnesia-app-module/PR-1223:
Make a separate application module for Mnesia
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* maint:
New commands to ease looking up OTP documentation
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* leoliu/tools/emacs-erldoc/PR-1197/OTP-14018:
New commands to ease looking up OTP documentation
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typo
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As of LLVM 3.9, the x86-call-frame-opt pass in LLVM's X86 backend causes
the stack descriptors to contain incorrect (or even negative) frame
sizes or root slot offsets.
This might cause LLVM-compiled modules to be rejected during loading
with a badarg exception in hipe_bifs:enter_sdecs/1 (which additionally
prints a "hipe_bifs_enter_sdesc_1: bad sdesc!" message to stderr), or it
might cause corruption or segmentation faults when walking stacks (f.ex.
during GC) containing frames compiled with ErLLVM.
As a workaround, we pass the -no-x86-call-frame-opt flag to llc when
the version is at least 3.9
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ErLLVM was declaring atoms in the following manner:
@atom_ok = external constant i64
; Used inside a function like this
%var = ptrtoint i64* @atom_ok to i64
However, doing so makes LLVM think the `atom_ok` is 8-byte aligned,
since it refers to a i64 value. This resulted in LLVM occasionally
incorrectly optimising away type tests on atoms, causing incorrect
behaviour or even segfaults. One such case is in
bs_match_compiler:coverage_apply/2, in which an is_boxed test on a
literal atom was optimised away, causing the code to try and load the
"header" of an atom. This problem reproduces with LLVM versions 3.7
through 3.9.
By declaring atoms as i8 (byte) constants instead, LLVM no longer makes
these alignment assumptions, and the bug is fixed.
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* kostis/hipe-bs_match_string/PR-1234/OTP-14005:
Add a test case that should now work
Fix the native code translation of bs_match_string
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* ferd/ssl-allow-ecc-config/PR-1210/OTP-13959:
Add ECC curve selection order config in TLS server
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* egil/erts/cuddle-tests:
stdlib: Increase timeouts in ets_SUITE
stdlib: Increase timeouts in rand_SUITE
stdlib: Increase timeouts in base64_SUITE
erts: Use cmd on windows for port_SUITE
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Remove one unused clause found by dialyzer.
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