Benchmark

non-incremental/QF_BV/brummayerbiere/nlzbsdown016.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
Size5565
Compressed Size1145
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 5557
Compressed Size1147
Max. Term Depth52
Asserts 1
Declared Functions0
Declared Constants1
Declared Sorts 0
Defined Functions0
Defined Recursive Functions 0
Defined Sorts0
Constants0
Declared Datatypes0

Symbols

ite61 not5 =58 let42
bvnot17 bvand16 bvor16 bvadd16
bvsub5 bvshl16 bvlshr4 zero_extend16

Evaluations

Evaluation Rating Solver Variant Result Wallclock CPU Time
SMT Evaluation 2013 0.11 (8/9) 4Simp 4Simp-SMT-COMP-2012 default unsat ✅ 0.02757 —
Abziz abziz_portfolio_2011_minfeatures_2 default unsat ✅ 0.02751 —
abziz_portfolio_2011_solvers_2 default unsat ✅ 0.02753 —
abziz_portfolio_2012_minfeatures default unsat ✅ 0.02766 —
abziz_portfolio_2012_solvers default unknown ❌ — —
AbzizPortfolio-SMT-COMP-2012 default unsat ✅ 0.02750 —
Boolector Boolector-1.5.118-SMT-EVAL-2013 default unsat ✅ 0.01951 —
Boolector-SMT-COMP-2011 default unknown ❌ — —
Boolector-SMT-COMP-2012 default unsat ✅ 0.02523 —
CVC3 CVC3-SMT-COMP-2010 default unknown ❌ — —
CVC3-SMT-COMP-2011 default unknown ❌ — —
CVC3-SMT-COMP-2012 default unsat ✅ 1.03574 —
CVC4 CVC4-SMT-COMP-2012-Resubmission default unsat ✅ 0.04639 —
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 unsat ✅ 0.01273 —
SONOLAR-SMT-COMP-2010 default unsat ✅ 0.08978 —
SONOLAR-SMT-COMP-2011 default unsat ✅ 0.01739 —
SONOLAR-SMT-COMP-2012 default unsat ✅ 0.01900 —
STP STP2-SMT-COMP-2011 default unsat ✅ 0.01990 —
STP2-SMT-COMP-2012 default unsat ✅ 0.02902 —
simplifyingSTP-SMT-COMP-2010 default unsat ✅ 0.02267 —
Z3 Z3-4.3.2.a054b099c1d6-x64-debian-6.0.6-SMT-EVAL-2013 default unsat ✅ 0.01443 —
Z3-SMT-COMP-2011 default unsat ✅ — —
SMT-COMP 2014 4Simp 4Simp - 2014 default unsat ✅ 0.02549 0.01500
Abziz abziz_portfolio_all_features default unsat ✅ 0.06437 0.04899
abziz_portfolio_min_features default unsat ✅ 0.05536 0.04199
Boolector Boolector boolector unsat ✅ 0.05255 0.04399
CVC4 CVC4 f7118b2 default unsat ✅ 0.07509 0.13298
MathSAT MathSAT-5.2.12-Main default unsat ✅ 0.09416 0.08499
SONOLAR sonolar_smtcomp-2014 default unsat ✅ 0.01496 0.01200
STP stp-cryptominisat4 default unsat ✅ 0.03247 0.03099
Yices2 Yices-2.2.1-smtcomp2014 default unsat ✅ 0.01669 0.00800
Z3 Z3-4.3.2.a054b099c1d6-x64-debian-6.0.6-SMT-COMP-2014 default unsat ✅ 0.02220 0.01300
SMT-COMP 2015 Boolector Boolector SMT15 QF_BV final boolector_qf_bv unsat ✅ 0.03601 0.03499
CVC4 CVC4-master-2015-06-15-9b32405-main default unsat ✅ 0.08067 0.14398
CVC4-experimental-2015-06-15-ff5745a-main default unsat ✅ 0.07903 0.14198
MathSAT MathSat 5.3.6 main smtcomp2015_main unsat ✅ 0.09869 0.09798
SMT-RAT SMT-RAT-final default unsat ✅ 1.04710 1.04684
STP stp-cryptominisat4 default unsat ✅ 0.03210 0.03099
stp-cmsat4-v15 default unsat ✅ 0.03037 0.02899
stp-cmsat4-mt-v15 default unknown ❌ 0.03770 0.03599
stp-minisat-v15 default unsat ✅ 0.03070 0.02999
Yices2 Yices default unsat ✅ 0.00896 0.00800
Z3 z3 4.4.0 default unsat ✅ 0.03732 0.03699
SMT-COMP 2016 ABC ABC_default default_abc unsat ✅ 0.07777 0.07638
ABC_glucose glucose unsat ✅ 0.10167 0.10227
Boolector Boolector boolector unsat ✅ 0.10170 0.10173
Boolector preprop boolector unsat ✅ 0.10618 0.10633
CVC4 CVC4-master-2016-05-27-cfef263-main default unsat ✅ 0.07781 0.14145
MapleSTP MapleSTP default unsat ✅ 0.02566 0.02588
MapleSTP-mt default unsat ✅ 0.02775 0.04848
MathSAT mathsat-5.3.11-linux-x86_64-Main default unsat ✅ 0.08554 0.08653
MinkeyRink Minkeyrink 2016 default unsat ✅ 0.08644 0.09875
Q3B Q3B default unsat ✅ 0.08395 0.08433
STP stp-cms-exp-2016 default unsat ✅ 0.02567 0.02565
stp-cms-mt-2016 default unsat ✅ 0.02862 0.05039
stp-cms-st-2016 default unsat ✅ 0.02598 0.02654
stp-minisat-st-2016 default unsat ✅ 0.02965 0.02958
Yices2 Yices-2.4.2 default unsat ✅ 0.01222 0.00628
Z3 z3-4.4.1 default unsat ✅ 0.03552 0.03674
SMT-COMP 2017 0.12 (7/8) Boolector Boolector+CaDiCaL SMT17 final boolector unsat ✅ 0.05418 0.05300
Boolector SMT17 final boolector unsat ✅ 0.13078 0.13009
CVC4 CVC4-smtcomp2017-main default unsat ✅ 0.09202 0.16714
MathSAT mathsat-5.4.1-linux-x86_64-Main default unsat ✅ 0.09099 0.09048
MinkeyRink MinkeyRink 2017.3a default unsat ✅ 0.09461 0.05504
Q3B Q3B default unknown ❌ 0.11963 0.12132
STP stp_st default unsat ✅ 0.03687 0.03716
stp_mt default unsat ✅ 0.06352 0.04434
Yices2 Yices2-Main default unsat ✅ 0.01789 0.00734
Z3 z3-4.5.0 default unsat ✅ 0.03947 0.03887
SMT-COMP 2018 Boolector Boolector_default unsat ✅ 0.05583 0.05577
CVC4 master-2018-06-10-b19c840-competition-default_default unsat ✅ 0.16021 0.16038
MathSAT mathsat-5.5.2-linux-x86_64-Main_default unsat ✅ 0.08484 0.08587
MinkeyRink Minkeyrink MT_mt unsat ✅ 0.03985 0.04308
Minkeyrink ST_st unsat ✅ 0.03793 0.03816
STP STP-CMS-st-2018_default-no-stderr unsat ✅ 0.02926 0.02943
STP-CMS-mt-2018_multicore-no-stderr unsat ✅ 0.03210 0.03838
STP-Riss-st-2018_riss-no-stderr unsat ✅ 0.09274 0.09282
Yices2 Yices 2.6.0_default unsat ✅ 0.01277 0.00850
Z3 z3-4.7.1_default unsat ✅ 0.04167 0.04163