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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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* 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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* 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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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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Conflicts:
OTP_VERSION
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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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'egil/erts/fix-configure-to-check-in-libsct-for-sctp-funcs/ERL-262/OTP-13956' into maint-19
* egil/erts/fix-configure-to-check-in-libsct-for-sctp-funcs/ERL-262/OTP-13956:
Configure enable libsctp dependency
Revert "Check libsctp for sctp funcs in configure.in"
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* bjorn/erts/erl_prim_loader/OTP-14009:
Update preloaded modules
Fix performance bug in erl_prim_loader:get_modules/{2,3}
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* egil/19/erts/fix-crashdump-sigusr1/OTP-13997:
erts: Fix SIGUSR1 crashdump generation
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This reverts commit 52fae83743a6e84d719f4f82fe45e6e0efdbd6f0:
Check libsctp for sctp funcs in configure.in
Call AC_CHECK_LIB before calling AC_CHECK_FUNCS to check for functions in libsctp.
Otherwise AC_CHECK_FUNCS will not link with libsctp to see if function exists.
Reverting to the old behaviour of not checking for libsctp before checking for
sctp functions. Then it works on Linux by loading libsctp and looking up the
symbols i runtime, and it works on FreeBSD since there is no separate libsctp
to link against - the functions are part of the default system libraries.
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