Benchmark

non-incremental/QF_BV/brummayerbiere/nlzbsdown256.smt2 

Number of leading zeros nlz(x) algorithm, binary search, counting down
From the book "Hacker's delight" by Henry S. Warren, Jr., page 78
We cross-check it with an obvious method of counting leading zeros:

s = 0;
for (i = BW - 1; i >= 0; i--)
  if (x & (1 << i))
    break;
  else
    s++;

Contributed by Robert Brummayer (robert.brummayer@gmail.com)
Benchmark
Size71961
Compressed Size5081
License Creative Commons Attribution 4.0 International (CC-BY-4.0)
Categorycrafted
First Occurrence2008-07-07
Generated By—
Generated On—
Generator—
Dolmen OK1
strict Dolmen OK1
check-sat calls1
Query 1
Status unsat
Inferred Status unsat
Size 71953
Compressed Size5089
Max. Term Depth544
Asserts 1
Declared Functions0
Declared Constants1
Declared Sorts 0
Defined Functions0
Defined Recursive Functions 0
Defined Sorts0
Constants0
Declared Datatypes0

Symbols

ite793 not9 =786 let534
bvnot257 bvand256 bvor256 bvadd256
bvsub9 bvshl256 bvlshr8 zero_extend256

Evaluations

Evaluation Rating Solver Variant Result Wallclock CPU Time
SMT Evaluation 2013 1.00 (0/9) 4Simp 4Simp-SMT-COMP-2012 default unknown ❌ — —
Abziz abziz_portfolio_2011_minfeatures_2 default unknown ❌ — —
abziz_portfolio_2011_solvers_2 default unknown ❌ — —
abziz_portfolio_2012_minfeatures default unknown ❌ — —
abziz_portfolio_2012_solvers default unknown ❌ — —
AbzizPortfolio-SMT-COMP-2012 default unknown ❌ — —
Boolector Boolector-1.5.118-SMT-EVAL-2013 default unknown ❌ — —
Boolector-SMT-COMP-2011 default unknown ❌ — —
Boolector-SMT-COMP-2012 default unknown ❌ — —
CVC3 CVC3-SMT-COMP-2010 default unknown ❌ — —
CVC3-SMT-COMP-2011 default unknown ❌ — —
CVC3-SMT-COMP-2012 default unknown ❌ — —
CVC4 CVC4-SMT-COMP-2012-Resubmission default unknown ❌ — —
CVC4-SMT-EVAL-2013 default unknown ❌ — —
MathSAT MathSAT5-5.2.6-SMT-EVAL-2013 default unknown ❌ — —
MathSAT5-HeavyBV-SMT-COMP-2012 default unknown ❌ — —
MathSAT5-SMT-COMP-2011 default unknown ❌ — —
MathSAT5-SMT-COMP-2012 default unknown ❌ — —
SONOLAR SONOLAR-2013-05-15-SMT-EVAL-2013 default unknown ❌ — —
SONOLAR-SMT-COMP-2010 default unknown ❌ — —
SONOLAR-SMT-COMP-2011 default unknown ❌ — —
SONOLAR-SMT-COMP-2012 default unknown ❌ — —
STP STP2-SMT-COMP-2011 default unknown ❌ — —
STP2-SMT-COMP-2012 default unknown ❌ — —
simplifyingSTP-SMT-COMP-2010 default unknown ❌ — —
Z3 Z3-4.3.2.a054b099c1d6-x64-debian-6.0.6-SMT-EVAL-2013 default unknown ❌ — —
Z3-SMT-COMP-2011 default unknown ❌ — —
SMT-COMP 2014 0.11 (8/9) 4Simp 4Simp - 2014 default unsat ✅ 4.00153 3.98839
Abziz abziz_portfolio_all_features default unsat ✅ 12.94960 12.84180
abziz_portfolio_min_features default unsat ✅ 11.27620 11.15300
Boolector Boolector boolector unsat ✅ 40.74740 40.75480
CVC4 CVC4 f7118b2 default unknown ❌ 0.07873 0.06899
MathSAT MathSAT-5.2.12-Main default unsat ✅ 171.00700 171.05600
SONOLAR sonolar_smtcomp-2014 default unsat ✅ 5.95249 5.95109
STP stp-cryptominisat4 default unsat ✅ 3.10239 3.09453
Yices2 Yices-2.2.1-smtcomp2014 default unsat ✅ 7.57951 7.57385
Z3 Z3-4.3.2.a054b099c1d6-x64-debian-6.0.6-SMT-COMP-2014 default unsat ✅ 6.88791 6.88195
SMT-COMP 2015 0.14 (6/7) Boolector Boolector SMT15 QF_BV final boolector_qf_bv unsat ✅ 26.14340 26.15300
CVC4 CVC4-master-2015-06-15-9b32405-main default unsat ✅ 49.98190 99.96880
CVC4-experimental-2015-06-15-ff5745a-main default unsat ✅ 50.36270 101.00200
MathSAT MathSat 5.3.6 main smtcomp2015_main unsat ✅ 85.72500 85.70800
SMT-RAT SMT-RAT-final default unknown ❌ 2400.01000 2400.47000
STP stp-cryptominisat4 default unsat ✅ 3.08507 3.08453
stp-cmsat4-v15 default unsat ✅ 2.80465 2.80457
stp-cmsat4-mt-v15 default unknown ❌ 1.34841 1.34779
stp-minisat-v15 default unsat ✅ 4.04001 4.04039
Yices2 Yices default unsat ✅ 7.52904 7.53185
Z3 z3 4.4.0 default unsat ✅ 4.97781 4.98024
SMT-COMP 2016 ABC ABC_default default_abc unsat ✅ 4.23042 4.20314
ABC_glucose glucose unsat ✅ 19.17430 19.17000
Boolector Boolector boolector unsat ✅ 29.56160 29.57670
Boolector preprop boolector unsat ✅ 29.62020 29.63800
CVC4 CVC4-master-2016-05-27-cfef263-main default unsat ✅ 50.82160 101.89200
MapleSTP MapleSTP default unsat ✅ 7.81534 7.81981
MapleSTP-mt default unsat ✅ 9.50275 33.88450
MathSAT mathsat-5.3.11-linux-x86_64-Main default unsat ✅ 104.15000 104.21100
MinkeyRink Minkeyrink 2016 default unsat ✅ 19.58670 24.76560
Q3B Q3B default unsat ✅ 1.35939 3.71000
STP stp-cms-exp-2016 default unsat ✅ 6.43364 6.43728
stp-cms-mt-2016 default unsat ✅ 6.95398 22.90010
stp-cms-st-2016 default unsat ✅ 6.16087 6.16436
stp-minisat-st-2016 default unsat ✅ 23.60520 23.61860
Yices2 Yices-2.4.2 default unsat ✅ 5.35474 5.35773
Z3 z3-4.4.1 default unsat ✅ 14.72610 14.73570
SMT-COMP 2017 Boolector Boolector+CaDiCaL SMT17 final boolector unsat ✅ 20.91010 20.90550
Boolector SMT17 final boolector unsat ✅ 50.01330 50.00370
CVC4 CVC4-smtcomp2017-main default unsat ✅ 48.01580 96.24330
MathSAT mathsat-5.4.1-linux-x86_64-Main default unsat ✅ 108.95600 108.95000
MinkeyRink MinkeyRink 2017.3a default unsat ✅ 5.16981 5.24709
Q3B Q3B default unsat ✅ 1.10164 2.78000
STP stp_st default unsat ✅ 7.89647 7.88558
stp_mt default unsat ✅ 7.66909 16.09580
Yices2 Yices2-Main default unsat ✅ 6.10175 6.10257
Z3 z3-4.5.0 default unsat ✅ 5.69033 5.68897
SMT-COMP 2018 Boolector Boolector_default unsat ✅ 19.03400 19.03370
CVC4 master-2018-06-10-b19c840-competition-default_default unsat ✅ 49.36280 49.36480
MathSAT mathsat-5.5.2-linux-x86_64-Main_default unsat ✅ 109.42500 109.42700
MinkeyRink Minkeyrink MT_mt unsat ✅ 5.90403 19.44250
Minkeyrink ST_st unsat ✅ 6.29103 6.29060
STP STP-CMS-st-2018_default-no-stderr unsat ✅ 5.00360 5.00343
STP-CMS-mt-2018_multicore-no-stderr unsat ✅ 6.47939 21.56020
STP-Riss-st-2018_riss-no-stderr unsat ✅ 7.31905 7.31758
Yices2 Yices 2.6.0_default unsat ✅ 4.52478 4.52469
Z3 z3-4.7.1_default unsat ✅ 5.61944 5.61922
SMT-COMP 2019 Boolector Boolector-wrapped-sq_default unsat ✅ 11.13240 11.13180
Poolector-wrapped-sq_default unsat ✅ 13.32690 52.34000
Boolector-ReasonLS boolector-ReasonLS-wrapped-sq_default unsat ✅ 57.40200 114.68400
CVC4 CVC4-2019-06-03-d350fe1-wrapped-sq_default unsat ✅ 284.70000 284.54600
MinkeyRink MinkeyRink MT-wrapped-sq_default unsat ✅ 0.48980 1.22319
MinkeyRink ST-wrapped-sq_default unsat ✅ 0.49781 0.49782
Par4 Par4-wrapped-sq_default unsat ✅ 6.03343 17.97000
STP STP-2019-wrapped-sq_default unsat ✅ 4.80096 4.80112
stp-mergesat-fixed-wrapped-sq_default unsat ✅ 44.39870 44.40130
stp-minisat-wrapped-sq_default unsat ✅ 4.19116 4.19049
stp-mt-wrapped-sq_default unsat ✅ 6.33983 20.28560
stp-portfolio-fixed-wrapped-sq_default unsat ✅ 42.49130 51.71680
stp-riss-wrapped-sq_default unknown ❌ 1.40881 1.40913
Yices2 Yices 2.6.2-wrapped-sq_default unsat ✅ 5.42526 5.42527
Yices 2.6.2 Cadical-wrapped-sq_default unsat ✅ 5.59058 5.59076
Yices 2.6.2 Cryptominisat-wrapped-sq_default unsat ✅ 31.10460 31.10420
Yices 2.6.2 MCSAT BV-wrapped-sq_default unknown ❌ 2400.02000 2399.46000
Yices 2.6.2 new bvsolver-wrapped-sq_default unsat ✅ 4.09890 4.09915
Z3 z3-4.8.4-d6df51951f4c-wrapped-sq_default unsat ✅ 4.63102 4.63125
SMT-COMP 2021 Bitwuzla Bitwuzla-fixed_default unsat ✅ 15.73500 15.73320
MathSAT mathsat-5.6.6_default unsat ✅ 132.34500 132.31700
STP STP 2021.0_default unsat ✅ 6.31221 20.95260
Z3 z3-4.8.11_default unsat ✅ 5.63779 5.63684
SMT-COMP 2022 Bitwuzla Bitwuzla-fixed_default unsat ✅ 15.15810 15.15710
Bitwuzla-wrapped_default unsat ✅ 14.75120 14.74030
cvc5 cvc5-default-2022-07-02-b15e116-wrapped_sq unsat ✅ 1023.00000 1022.60000
MathSAT MathSAT-5.6.8_default unsat ✅ 145.51000 145.50200
STP STP 2022.4_default unsat ✅ 11.04800 11.04740
Yices2 Yices 2.6.2 for SMTCOMP 2021_default unsat ✅ 7.34542 7.34478
Z3++BV z3++bv_0702_default unsat ✅ 61.91960 61.91340
Z3 z3-4.8.17_default unsat ✅ 6.24024 6.24136
SMT-COMP 2023 0.17 (5/6) Bitwuzla Bitwuzla-fixed_default unsat ✅ 6.66667 6.66611
cvc5 cvc5-default-2023-05-16-ea045f305_sq unsat ✅ 874.24000 873.87400
STP STP 2022.4_default unsat ✅ 11.04730 11.04790
STP 2022.4_default unsat ✅ 11.02390 11.02210
UltimateEliminator UltimateIntBlastingWrapper+SMTInterpol_default unknown ❌ 1200.08000 1266.24000
Yices2 Yices 2 for SMTCOMP 2023_default unsat ✅ 5.46423 5.46287
Z3-Owl z3-Owl-Final_default unsat ✅ 22.02100 22.01840
z3-Owl-Final_default unsat ✅ 23.05950 23.05870
SMT-COMP 2024 0.17 (5/6) Bitwuzla Bitwuzla unsat ✅ 8.37009 8.26973
cvc5 cvc5 unsat ✅ 833.29895 833.18879
SMTInterpol SMTInterpol unknown ❌ 1201.74428 1207.35995
STP STP unsat ✅ 6.72124 6.61791
Yices2 Yices2 unsat ✅ 9.78109 9.68099
Z3alpha Z3-alpha unsat ✅ 73.35037 73.21718