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test_two_fixnums would previously only check its right-hand argument for
immediates, but not it's left. Now, test_two_fixnums reduces to
test_fixnum if either argument is an immediate.
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By changing mask_and_compare from and,sub to sub,and, x86 can use a
3-address LEA immediate add, saving a mov. The RISC backends should see
no change in sequence length.
We make test_(heap_|sub)binary use mask_and_compare so they will benefit
too.
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The addsub sequence was suboptimal when one of the arguments was
immediate, because it became an immediate alu followed by an immediate
alub, and the optimisers would not combine them due to the risk of
altering the branch. However, in this case we know that such a rewrite
is safe, and do it directly in hipe_tagscheme:fixnum_addsub/5 instead.
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This makes the fast case a fallthrough and the slow case a branch,
hopefully improving cache locality.
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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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Add additional details on the behavior of supervisors when
reaching maximum restart intensity, as stated by @rvirding
at [Medium](https://goo.gl/XhwpSL)
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to get errors for "#if UNDEFINED_MACRO"
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* tokitori/stdlib/optimize-sets/PR-1212/OTP-14035:
Speed up sets:add_element/2 and sets:del_element/2
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* github/pr/1227:
Update configure to work better on Mac
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Jump functions returns the state after performing jump calculation to a
rand module internal state, which is equivalent to perform a large
number of calls of calculating new states for XorShift*/+ algorithms.
This commit add jump functions for exsplus and exs1024 algorithms, and a
wrapper function jump/1. The wrapper function will cause error with
reason "not_implemented" if the jump function for the algorithm is not
implemented.
This commit adds following new functionalities:
- Add new functions rand:jump/0 and rand:jump/1
- Add the member jump to type alg_handler(), a fun for performing
the jump function
- Add jump functions for exsplus, equivalent to 2^64 calls
- Add jump functions for exs1024, equivalent to 2^512 calls
- Revise seed_put/1, seed/1, seed/2
See <https://github.com/erlang/otp/pull/1235#discussion_r86950557>
- Add dummy jump function for exs64 calling
erlang:error(not_implemented)
- Add jump function test cases as follows:
* Add Common Test group reference_jump
* Add tests for jump/0 to reference_jump_procdict/1
* Rename tests for jump/1 to reference_jump_state/1
* Rename gen_jump/1 to gen_jump_1/1
* Add Common Tests reference_jump_procdict and reference_jump_state
to the group reference_jump
- Add jump function documentation
This commit also changes the Copyright year for Kenji Rikitake's code
from 2015 to 2015-2016.
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The fixpoint iteration added in 05130e48 makes those calls
superfluous.
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* sverker/hipe-no-pie-amd64:
erts: Disable -fPIE for HiPE on x86_64
erts: Fix correct link flags for hipe_mkliterals
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and no need for $(INCLUDED).
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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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Continuations returned from mnesia_ext backends were originally wrapped with
the backend module, but that was a remnant of the earliest implementation,
and is not actually needed, since Mnesia already knows what the table
storage type is when it applies the continuation. When mnesia_ext was ported
to OTP 19, the wrapper got changed to use the table type alias instead of
the module, which triggered an error in the mnesia_eleveldb backend. This
patch removes the wrapping completely.
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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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* ingela/ssl/ECC-certs-test:
ssl: Use SHA2 for signing ECC certs if possible
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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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