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This commit adds a new parser option, --hol, which marks that HOL is being used. This option has the effect of prepending the problem's logic with "HO_", which teels the solver that the logic is higher order. The parser builder, base parser, and SMT2 and TPTP parsers are all updated to work with this new setting, as is the logic info class.
For now this parser option is enabling the --uf-ho option for internal use, since for now higher-order solving relies it. In a future PR this dependency will be removed (since this information is already given to the SMT solver via the logic).
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solve-int-as-bv is now the preferred method for solving these benchmarks.
Adds solve-int-as-bv to a regression that became slow in my previous commit.
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This PR ensures we do not eagerly rewrite bv2nat and int2bv when using solve-bv-as-int. Instead they are rewritten during expandDefinitions (at the end of preprocessing).
It also updates regressions that relied on lazy extended function reductions in the lazy solver to use solve-bv-as-int, and adds a missing case (INT_TO_BITVECTOR) in the solve-int-as-bv preprocessing pass.
A followup PR will remove support for lazy extended function reductions for bv2nat / int2bv altogether.
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After commit 327a24508ed1d02a3fa233e680ffd0b30aa685a9, the int-to-bv
preprocessing pass is getting rewritten terms. As a result, the terms
can contain negative constants (instead of `(- c)`, i.e., `UMINUS` of a
positive constant) and `NONLINEAR_MULT`. The commit adds support for
those cases, does some minor cleanup, and adds regressions. The
regressions should allow us to detect if/when the preprocessing pass
breaks in the future.
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Fixes #6717. Commit 11c1fba added some
new rewrites for ITE. Due to the new rewrites taking precedence over
existing rewrites, it could happen that some of the previous rewrites
did not apply anymore even though they would have further simplified the
ITE. In the example from the issue, (ite c c true) was rewritten to
(or (not T) T) instead of (ite T true true) and then true. The
commit fixes the issue by moving rewrites resulting in
conjunctions/disjunctions to the end.
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This PR makes a new regression explicitly require statistics.
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This updates 2-dim dependent bounded quantifiers to not map constants to terms when computing ranges, when the type of the variable is closed enumerable. This is require to fix an incorrect model (possible solution unsoundness) issue in the reduction of str.indexof_re.
Fixes the 1st, 4th and 5th benchmarks from #6653. Fixes #6635.
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This PR fixes a typo in the option handler for the statistics options, which lead to options not properly propagating.
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Fixes the 2nd benchmark from #6653.
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This PR fixes a missing connection in trust substitution proofs, which was the cause of open proofs when solved equalities from ppAssert were not justified by proofs.
Also distinguishes TRUST_SUBS_EQ from TRUST_SUBS_MAP for clarity.
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Fixes #6681. When checking whether SPLIT_EQ_STRIP_L applies, we were
using sripSymbolicLength, which changes its inputs depending on how
many elements of the concatenation it could strip. However, one of the
arguments, pfxv0, was reused across multiple checks if the strip did
not result in a rewrite. Later invocations were wrong as a result. This
commit changes the call to stripSymbolicLength() to use a new copy of
the vector instead.
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This commit enables the new bitblast solver by default. This commit also fixes model generation for Boolean variables when --bitblast=eager is enabled.
Fixes #3958, #5396, #5736, #5743, #5947.
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Fixes #6636, fixes #6637. When the start index was non-zero, the result of
str.indexof_re was not properly restricted to be greater or equal to
the start index. This commit fixes the issue by making the eager
reduction lemma more precise. Additionally, the commit fixes an issue
with the lower bound of the length of the match in str.indexof_re.
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We plan to add a unary pow2 operator to cvc5, that is obtained from the binary operator pow by fixing the first argument to 2.
An initial working branch is here: https://github.com/yoni206/cvc5/tree/pow2
This PR does the first step, which is to rename some uninterpreted symbols in regression tests from pow2 to p2, to avoid clashing with the new operator.
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Fixes #6661. The option `--strings-inm` could be used to ignore negative
membership constraints. However, this option made the string solver
model-unsound or produced incorrect models if the user provided a
benchmark that actually contained negative membership constraints. The
solver did not check for negative membership constraints and did not
warn the user about them. Because the option is not really being used,
this commit removes it.
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Fixes cases of satisfiable unsat cores when proofs are enabled.
Unfortunately, this bug was also preventing us from doing the final scope check for all proof checking. As this was not being tested, this PR uncovers that proof checking is now failing on 6 regressions. I'm disabling proof checking here and will address these issues on later PRs.
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Fixes #6643. The STRINGS_CTN_DECOMPOSE inference is always a conflict
but we sometimes sent it as an inference. To make sure that the
inference manager actually recognizes the inference as a conflict, this
commit ensures that the conclusion is always false and modifies the
explanation accordingly.
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This PR fixes a subtle issue with double negations when producing proofs in the circuit propagator.
Adds the test case as a new regression, as well as some similar instances.
Fixes cvc5/cvc5-projects#277.
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Disables two regressions that have been timing out causing nightlies to fail.
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Fixes #6337 (the other benchmarks in this issue are either solved
correctly or time out after the changes in #6615) and fixes #5665.
While computing the model for a nested equivalence class containing
seq.unit, we were looking up the representative of the argument in
(seq.unit (seq.unit j)) and the representative was simpliy (seq.unit j). However, we had assigned (seq.unit 0) to (seq.unit j) earlier.
A second equivalence class of type (Seq (Seq Int)) and length 1 was
later assigned (seq.unit (seq.unit 0)) and we didn't detect that
(seq.unit (seq.unit j)) and (seq.unit (seq.unit 0)) have the same
value. This was incorrect because we do not allow assigning the same
value to different equivalence classes. In this case, it led to one of
the assertions being false.
This commit fixes the issues in two ways: it ensures that types are
processed in ascending order of nesting (e.g., (Seq Int) terms are
processed before (Seq (Seq Int)) terms) and it changes the procedure
to look up the representative in the model instead of the theory state
to take into account the model values assigned to the elements of
sequences.
cc @yoni206
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This commit adds --no-jh-rlv-order to two string regressions that take
over 2 minutes to run in debug after #6613, which increases the overall
regression runtime significantly.
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Fixes #5508. `STRINGS_CTN_DECOMPOSE` could be triggered multiple times
by the same term, which resulted in an assertion failure. This commit
returns immediately after the first conflict to avoid the assertion
failure.
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Fixes #6620, fixes #6622. Fixes cvc5/cvc5-projects#254.
The benchmarks from the 2 issues timeout, a regression is added for the projects issue.
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Fixes #6057. The reductions of `str.replace_re` and `str.replace_re_all`
were not correctly enforcing that the operations replace the _first_
occurrence of some regular expression in a string. This commit fixes the
issue by introducing a new operator `str.indexof_re(s, r, n)`, which,
analoguously to `str.indexof`, returns the index of the first match of
the regular expression `r` in `s`. The commit adds basic rewrites for
evaluating the operator as well as its reduction. Additionally, it
converts the reductions of `str.replace_re` and `str.replace_re_all` to
use that new operator. This simplifies the reductions of the two
operators and ensures that the semantics are consistent between the two.
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Fixes a solution soundness issue caused by allowing ineligible terms of kind BOOLEAN_TERM_VARIABLE to appear in instantiations.
This also corrects the expected solution on a benchmark that had an incorrect status.
Fixes #6603.
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Fixes 2nd benchmark from #6605.
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This commit fixes an assertion failure in the rewriter on some of the
SMT-LIB QF_ABVFP benchmarks (the regression in this commit is the
minified version of
`non_incremental/QF_ABVFP/20170428-Liew-KLEE/imperial_gsl_benchmarks_statistics_klee.x86_64/query.14.smt2`).
The problem was that after applying the `BvComp` rewrite, the bit-vector
rewriter was returning `REWRITE_DONE` instead of `REWRITE_AGAIN`. The
rewrite simplifies expressions of the form `bvcomp(t, c)` where `c` is a
constant of bit-width 1. If `c` is zero, then the rewrite returns
`bvnot(t)`. This node can potentially be rewritten further, e.g., if `t`
is `bvnot(x)`. This commit fixes the response and adds the corresponding
tests.
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This enables the new implementation of justification heuristic by default.
Fixes #5454, fixes #5785. Fixes wishues 114, 115, 149, 160.
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Fixes followup issues from #6604.
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Fixes #6604.
Previously, re-elim was solution unsound for cases where the LHS and a component of the RHS were both empty. This ensures a length requirement is given for the LHS to ensure proper containment.
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Fixes #6545.
An assertion failure was being raised indicating that we were reporting a rewrite that was not changing the original term.
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This updates all regressions that pass check-unsat-cores to enable check-unsat-cores. This includes any incremental benchmark, which was disabled in run_regression.py previously.
It adds --no-check-unsat-cores to a few corner benchmarks that were previously disabled based on --incremental.
It also reverts a change to when proofs are disabled: options like sygus-inference should not permit proofs (or unsat cores).
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This PR does two things:
(1) It eliminates the ad-hoc implementation of printSynthSolutions and removes it from the API. Now, printing response to a check-synth command is done in a more standard way, using the API + symbol manager. This is analogous to recent refactoring to get-model.
(2) It updates cvc5's output in response to check-synth to be compliant with the upcoming sygus 2.1 standard. The standard has changed slightly: responses to check-synth are now closed in parentheses, mirroring the smt2 response to get-model.
It also removes the unused command GetSynthSolutionCommand.
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Previously, echo surpressed leading, trailing and escape quotes of the
string to print. However, the SMT-LIB standard states that the string is
to be printed as is, including those quote characters.
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Fixes #6567.
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We can thus close #3455, #3651, #4925, #5079, #5238, #5902, #5908, and #5604.
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This commit changes the default unsat cores to those based on solving-under-assumptions in the SAT solver and the (new) preprocessing proofs.
The evaluation below on all the non-fp non-incremental SMT-LIB benchmarks, 120s timeout, shows the differences of the unsat cores based on the old proofs, the new ones based on SAT assumptions + preprocessing proofs, and the new ones based on SAT and preprocessing proofs. Note that the union of the last two is on par with the first.
```
status total solved sat unsat best timeout memout error uniq disagr time_cpu memory
benchmark config
AUFDTLIRA newUnsatCoresAssumps-safe/ ee 35 4 0 4 4 7 0 23 2 0 954.0 1267.5
newUnsatCoresProofs ok 35 31 0 31 25 4 0 0 0 0 894.1 1692.9
oldUnsatCores ok 35 32 0 32 30 3 0 0 1 0 799.2 1428.5
AUFLIA newUnsatCoresAssumps-safe/ ok 11 7 0 7 7 4 0 0 7 0 532.2 7604.4
newUnsatCoresProofs ok 11 4 0 4 1 6 0 0 0 0 829.0 12459.8
oldUnsatCores ok 11 4 0 4 3 6 0 0 0 0 818.2 7764.4
AUFLIRA newUnsatCoresAssumps-safe/ to 2 0 0 0 0 2 0 0 0 0 241.6 125.6
newUnsatCoresProofs ok 2 2 0 2 1 0 0 0 0 0 54.2 45.5
oldUnsatCores ok 2 2 0 2 2 0 0 0 0 0 49.4 79.7
AUFNIRA newUnsatCoresAssumps-safe/ ok 10 5 0 5 5 5 0 0 2 0 748.4 1630.0
newUnsatCoresProofs ok 10 4 0 4 0 6 0 0 0 0 850.7 2978.8
oldUnsatCores ok 10 8 0 8 5 2 0 0 1 0 502.7 2048.5
BV newUnsatCoresAssumps-safe/ ok 7 1 1 0 1 6 0 0 1 0 734.2 2065.0
newUnsatCoresProofs ok 7 6 3 3 4 1 0 0 0 0 246.7 1023.9
oldUnsatCores ok 7 6 3 3 3 1 0 0 0 0 248.6 992.0
LIA newUnsatCoresAssumps-safe/ to 1 0 0 0 0 1 0 0 0 0 120.9 47.7
newUnsatCoresProofs ok 1 1 0 1 1 0 0 0 0 0 0.3 6.5
oldUnsatCores ok 1 1 0 1 1 0 0 0 0 0 0.3 5.3
LRA newUnsatCoresAssumps-safe/ ok 5 3 0 3 3 2 0 0 3 0 450.7 260.4
newUnsatCoresProofs ok 5 2 0 2 0 3 0 0 0 0 537.8 424.5
oldUnsatCores ok 5 2 0 2 2 3 0 0 0 0 533.8 298.5
NIA newUnsatCoresAssumps-safe/ to 1 0 0 0 0 1 0 0 0 0 120.8 22.0
newUnsatCoresProofs ok 1 1 0 1 0 0 0 0 0 0 46.3 48.0
oldUnsatCores ok 1 1 0 1 1 0 0 0 0 0 43.3 40.3
QF_ABV newUnsatCoresAssumps-safe/ ok 105 70 59 11 70 35 0 0 63 0 8195.5 19363.3
newUnsatCoresProofs ok 105 34 24 10 17 71 0 0 5 0 11099.5 35756.7
oldUnsatCores ok 105 37 23 14 18 69 0 0 1 0 11198.0 26878.1
QF_ANIA newUnsatCoresAssumps-safe/ to 4 0 0 0 0 4 0 0 0 0 483.5 1631.8
newUnsatCoresProofs ok 4 4 3 1 2 0 0 0 0 0 175.1 1513.6
oldUnsatCores ok 4 4 3 1 3 0 0 0 0 0 173.8 1495.1
QF_AUFLIA newUnsatCoresAssumps-safe/ ok 35 6 1 5 6 29 0 0 3 0 3718.4 524.1
newUnsatCoresProofs ok 35 24 4 20 1 11 0 0 0 0 2357.2 36556.0
oldUnsatCores ok 35 32 5 27 29 3 0 0 5 0 1857.6 10067.7
QF_AUFNIA newUnsatCoresAssumps-safe/ ok 3 1 0 1 1 2 0 0 0 0 324.7 543.6
newUnsatCoresProofs ok 3 2 2 0 1 1 0 0 1 0 223.1 509.0
oldUnsatCores ok 3 2 1 1 1 1 0 0 0 0 268.5 484.3
QF_AX newUnsatCoresAssumps-safe/ ok 12 1 0 1 1 11 0 0 0 0 1379.2 391.3
newUnsatCoresProofs ok 12 10 0 10 0 2 0 0 0 0 528.7 7433.9
oldUnsatCores ok 12 12 0 12 11 0 0 0 1 0 343.0 2855.2
QF_BV newUnsatCoresAssumps-safe/ ok 96 56 30 26 49 39 2 0 35 0 9248.2 98058.7
newUnsatCoresProofs ok 96 37 26 11 23 52 7 0 7 0 9781.9 135924.7
oldUnsatCores ok 96 50 29 21 24 43 3 0 7 0 9155.6 107216.0
QF_IDL newUnsatCoresAssumps-safe/ ok 109 51 39 12 43 58 0 0 33 0 10427.2 50846.5
newUnsatCoresProofs ok 109 33 32 1 2 76 0 0 0 0 11692.8 108963.1
oldUnsatCores ok 109 75 55 20 64 34 0 0 26 0 10088.1 53105.6
QF_LIA newUnsatCoresAssumps-safe/ ok 306 155 111 44 138 151 0 0 119 0 25346.4 50556.0
newUnsatCoresProofs ok 306 117 95 22 49 189 0 0 0 0 27092.6 122894.9
oldUnsatCores ok 306 187 110 77 152 119 0 0 34 0 24521.0 61261.1
QF_LRA newUnsatCoresAssumps-safe/ ok 72 39 20 19 38 33 0 0 31 0 7475.3 16892.2
newUnsatCoresProofs ok 72 31 16 15 2 41 0 0 0 0 7569.3 35658.7
oldUnsatCores ok 72 41 18 23 32 31 0 0 2 0 7243.2 20593.9
QF_NIA newUnsatCoresAssumps-safe/ ok 4389 2009 1862 147 2002 903 0 0 1931 0 163975.7 280779.3
newUnsatCoresProofs ok 4389 2326 2156 170 752 792 0 0 37 0 151051.9 387779.8
oldUnsatCores ok 4389 2394 2199 195 2174 730 0 0 81 0 146419.3 259669.8
QF_NRA newUnsatCoresAssumps-safe/ ok 135 65 57 8 57 70 0 0 45 0 10195.7 24701.4
newUnsatCoresProofs ok 135 71 49 22 35 64 0 0 5 0 10825.3 32982.8
oldUnsatCores ok 135 75 54 21 51 61 0 0 9 0 10865.3 27260.9
QF_RDL newUnsatCoresAssumps-safe/ ok 7 5 1 4 5 2 0 0 1 0 564.7 958.4
newUnsatCoresProofs ok 7 1 1 0 0 6 0 0 0 0 842.0 11029.6
oldUnsatCores ok 7 6 1 5 2 1 0 0 1 0 665.8 1982.6
QF_S newUnsatCoresAssumps-safe/ ok 5 1 1 0 0 4 0 0 0 0 603.3 191.4
newUnsatCoresProofs ok 5 5 5 0 2 0 0 0 0 0 161.9 285.8
oldUnsatCores ok 5 4 4 0 3 1 0 0 0 0 225.9 219.3
QF_SLIA newUnsatCoresAssumps-safe/ ok 258 74 67 7 70 184 0 0 64 0 27245.9 20290.4
newUnsatCoresProofs ok 258 179 163 16 47 79 0 0 6 0 18996.0 33722.6
oldUnsatCores ok 258 184 162 22 149 74 0 0 9 0 18395.8 23004.3
QF_UF newUnsatCoresAssumps-safe/ ok 29 25 0 25 6 4 0 0 2 0 2362.4 7504.3
newUnsatCoresProofs ok 29 0 0 0 0 28 1 0 0 0 3508.0 124190.7
oldUnsatCores ok 29 27 0 27 23 2 0 0 4 0 1866.3 13635.1
QF_UFBV newUnsatCoresAssumps-safe/ ok 2 2 0 2 1 0 0 0 1 0 189.5 1599.3
newUnsatCoresProofs to 2 0 0 0 0 2 0 0 0 0 241.8 1818.8
oldUnsatCores ok 2 1 0 1 1 1 0 0 0 0 193.7 1500.9
QF_UFIDL newUnsatCoresAssumps-safe/ ok 9 9 0 9 7 0 0 0 4 0 697.0 1133.0
newUnsatCoresProofs to 9 0 0 0 0 9 0 0 0 0 1088.0 14652.6
oldUnsatCores ok 9 5 0 5 2 4 0 0 0 0 848.5 2079.6
QF_UFLIA newUnsatCoresAssumps-safe/ ok 1 1 0 1 0 0 0 0 0 0 117.1 76.4
newUnsatCoresProofs to 1 0 0 0 0 1 0 0 0 0 120.9 208.5
oldUnsatCores ok 1 1 0 1 1 0 0 0 0 0 110.6 127.7
QF_UFLRA newUnsatCoresAssumps-safe/ ok 7 4 1 3 0 0 3 0 0 0 266.6 55098.3
newUnsatCoresProofs mo 7 0 0 0 0 0 7 0 0 0 261.7 56000.0
oldUnsatCores ok 7 7 4 3 7 0 0 0 3 0 408.4 20933.4
QF_UFNIA newUnsatCoresAssumps-safe/ ok 48 21 19 2 21 4 0 0 20 0 592.3 880.6
newUnsatCoresProofs ok 48 27 22 5 18 4 0 0 1 0 641.4 1548.8
oldUnsatCores ok 48 26 21 5 26 7 0 0 1 0 887.5 1044.6
QF_UFNRA newUnsatCoresAssumps-safe/ ok 1 1 1 0 1 0 0 0 1 0 108.3 17.9
newUnsatCoresProofs to 1 0 0 0 0 1 0 0 0 0 120.8 19.0
oldUnsatCores to 1 0 0 0 0 1 0 0 0 0 120.8 14.7
UF newUnsatCoresAssumps-safe/ ok 21 5 0 5 5 16 0 0 5 0 2123.8 3168.7
newUnsatCoresProofs ok 21 13 0 13 6 8 0 0 0 0 1496.3 6617.8
oldUnsatCores ok 21 16 0 16 11 5 0 0 3 0 1443.3 3919.2
UFDT newUnsatCoresAssumps-safe/ ok 35 6 0 6 6 29 0 0 5 0 3777.0 4485.5
newUnsatCoresProofs ok 35 28 0 28 15 7 0 0 0 0 1416.9 4293.6
oldUnsatCores ok 35 30 0 30 26 5 0 0 1 0 1406.9 3188.5
UFDTLIA newUnsatCoresAssumps-safe/ to 4 0 0 0 0 4 0 0 0 0 483.5 1640.5
newUnsatCoresProofs ok 4 4 0 4 1 0 0 0 0 0 139.3 942.3
oldUnsatCores ok 4 4 0 4 3 0 0 0 0 0 156.4 851.8
UFDTLIRA newUnsatCoresAssumps-safe/ ok 1 1 0 1 1 0 0 0 1 0 0.0 3.1
newUnsatCoresProofs ok 1 0 0 0 0 0 0 0 0 0 0.0 3.2
oldUnsatCores ok 1 0 0 0 0 0 0 0 0 0 0.0 2.7
UFDTNIRA newUnsatCoresAssumps-safe/ ok 10 3 0 3 3 6 0 0 3 0 754.8 1386.9
newUnsatCoresProofs ok 10 7 0 7 5 3 0 0 0 0 377.0 848.8
oldUnsatCores ok 10 7 0 7 7 3 0 0 0 0 376.5 563.4
UFLIA newUnsatCoresAssumps-safe/ ok 24 8 0 8 8 16 0 0 8 0 2231.6 3179.2
newUnsatCoresProofs ok 24 14 0 14 3 10 0 0 1 0 1915.5 5131.1
oldUnsatCores ok 24 15 0 15 14 9 0 0 2 0 1857.5 3479.7
UFNIA newUnsatCoresAssumps-safe/ ok 354 183 28 155 116 133 0 0 113 0 25941.4 839089.7
newUnsatCoresProofs ok 354 107 17 90 28 107 92 0 2 0 23496.9 1020258.1
oldUnsatCores ok 354 237 19 218 233 72 0 0 66 0 19906.9 914273.0
```
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Fixes #6560.
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Currently, when a :named attribute is used in a binder, the parser
complains about an illegal argument. This is because an argument check
in the SymbolManager fails. This is not very user friendly. This
commit makes the error message clearer for the user:
Cannot name a term in a binder (e.g., quantifiers, definitions)
To do this, the commit changes the return type for
SymbolManager::setExpressionName to include more information that can
then be used by the parser to generate an appropriate error message.
The commit also changes define-fun to not push/pop the local scope
if it has zero arguments because it is semantically equivalent to a
define-const, which allows :named terms.
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This PR modifies the rcons algorithm to loop over terms to reconstruct instead of obligations. It also modifies the Obs data structure to reflect this change. The rest of the PR is mostly updating documentation and refactoring the affected code.
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Fixes #6483. The benchmark in the issue was performing the following
incorrect rewrite:
Rewrite (str.replace "B" (str.replace (str.++ (str.replace "B" a "B") a) "B" "") "B") to (str.replace "B" a "B") by RPL_X_Y_X_SIMP.
The rewrite RPL_X_Y_X_SIMP rewrites terms of the form (str.replace x y x), where x is of length one and (= y "") rewrites to a
conjunction of equalities of the form (= y_i "") where y_i is some
term. The function responsible for collecting the terms y_i from this
conjunction, collectEmptyEqs(), returns a bool and a vector of
Nodes. The bool indicates whether all equalities in the conjunction
were of the form (= y_i ""). The rewrite RPL_X_Y_X_SIMP only applies
if this is true. However, collectEmptyEqs() had a bug where it would
not return false when all of the conjuncts were equalities but not all
of them were equalities with the empty string. This commit fixes
collectEmptyEqs() and adds tests.
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Fixes #6520. The `SPLIT_EQ_STRIP_R`/`SPLIT_EQ_STRIP_L` rewrites were
applied too aggressively. Those rewrites attempt to rewrite string
equalities between concatenations where the prefix on one side is
provably shorter than the prefix on the other side. The length of the
shorter prefix is then stripped from the longer prefix. However, cvc5
was not checking whether it was able to strip the length of the full
prefix. If cvc5 cannot strip the full length of the shorter prefix, then
the rewrite does not apply because parts of the shorter prefix would
have to be kept. This commit adds an additional condition that checks
whether the length of the full prefix was stripped.
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This PR improves the integration of the CAD solver with the nl-ext solver in a simple way: we simply use a few of the simple linearization lemmas in combination with CAD by default, significantly improving the performance on QF_NRA.
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applicable (#6529)
Fixes #6510.
This PR also eliminates a deprecated variant mkBooleanTermVariable from SkolemManager.
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This unifies top-level substitutions and theory model substitutions. Env is now passed to the TheoryModel, which has access to top-level substitutions.
The former was used for simplfying assertions in the preprocessor, the latter was used for evaluating terms in the model.
There is no reason to have these two things be separate.
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This removes the special case of TUPLE_UPDATE and RECORD_UPDATE in favor of the more general datatype update.
Datatype update is handled analogously to APPLY_SELECTOR / APPLY_TESTER.
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This moves regression test that exceed the time limit of their
respective level to the appropriate level. It further updates the
guidelines in the README with information on how to properly categorize
regression tests into levels (with time limits).
Note: Test regress3/issue4717.smt2 was previously unsolved (unknown) and
is now sat (Z3 agrees).
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Fixes #6495.
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