Benchmark

non-incremental/QF_BV/brummayerbiere/nlzbsdown008.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
Size3232
Compressed Size906
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 3224
Compressed Size900
Max. Term Depth33
Asserts 1
Declared Functions0
Declared Constants1
Declared Sorts 0
Defined Functions0
Defined Recursive Functions 0
Defined Sorts0
Constants0
Declared Datatypes0

Symbols

ite34 not4 =32 let23
bvnot9 bvand8 bvor8 bvadd8
bvsub4 bvshl8 bvlshr3 zero_extend8

Evaluations

Evaluation Rating Solver Variant Result Wallclock CPU Time
SMT Evaluation 2013 4Simp 4Simp-SMT-COMP-2012 default unsat ✅ 0.01599 —
Abziz abziz_portfolio_2011_minfeatures_2 default unsat ✅ 0.02296 —
abziz_portfolio_2011_solvers_2 default unsat ✅ 0.02271 —
abziz_portfolio_2012_minfeatures default unsat ✅ 0.02295 —
abziz_portfolio_2012_solvers default unsat ✅ 0.02345 —
AbzizPortfolio-SMT-COMP-2012 default unsat ✅ 0.02310 —
Boolector Boolector-1.5.118-SMT-EVAL-2013 default unsat ✅ 0.01134 —
Boolector-SMT-COMP-2011 default unsat ✅ 0.01754 —
Boolector-SMT-COMP-2012 default unsat ✅ 0.00981 —
CVC3 CVC3-SMT-COMP-2010 default unsat ✅ 0.17210 —
CVC3-SMT-COMP-2011 default unsat ✅ 0.15829 —
CVC3-SMT-COMP-2012 default unsat ✅ 0.15999 —
CVC4 CVC4-SMT-COMP-2012-Resubmission default unsat ✅ 0.02227 —
CVC4-SMT-EVAL-2013 default unsat ✅ 0.03039 —
MathSAT MathSAT5-5.2.6-SMT-EVAL-2013 default unsat ✅ 0.03179 —
MathSAT5-HeavyBV-SMT-COMP-2012 default unsat ✅ 0.04628 —
MathSAT5-SMT-COMP-2011 default unsat ✅ 0.02997 —
MathSAT5-SMT-COMP-2012 default unsat ✅ 0.02489 —
SONOLAR SONOLAR-2013-05-15-SMT-EVAL-2013 default unsat ✅ 0.00991 —
SONOLAR-SMT-COMP-2010 default unsat ✅ 0.01317 —
SONOLAR-SMT-COMP-2011 default unsat ✅ 0.01035 —
SONOLAR-SMT-COMP-2012 default unsat ✅ 0.01077 —
STP STP2-SMT-COMP-2011 default unsat ✅ 0.01284 —
STP2-SMT-COMP-2012 default unsat ✅ 0.01923 —
simplifyingSTP-SMT-COMP-2010 default unsat ✅ 0.01235 —
Z3 Z3-4.3.2.a054b099c1d6-x64-debian-6.0.6-SMT-EVAL-2013 default unsat ✅ 0.00983 —
Z3-SMT-COMP-2011 default unsat ✅ 0.01780 —
SMT-COMP 2014 4Simp 4Simp - 2014 default unsat ✅ 0.01929 0.00900
Abziz abziz_portfolio_all_features default unsat ✅ 0.04625 0.03299
abziz_portfolio_min_features default unsat ✅ 0.03823 0.03299
Boolector Boolector boolector unsat ✅ 0.02290 0.01400
CVC4 CVC4 f7118b2 default unsat ✅ 0.03338 0.05099
MathSAT MathSAT-5.2.12-Main default unsat ✅ 0.03488 0.02600
SONOLAR sonolar_smtcomp-2014 default unsat ✅ 0.01565 0.00500
STP stp-cryptominisat4 default unsat ✅ 0.02510 0.02399
Yices2 Yices-2.2.1-smtcomp2014 default unsat ✅ 0.01127 0.00300
Z3 Z3-4.3.2.a054b099c1d6-x64-debian-6.0.6-SMT-COMP-2014 default unsat ✅ 0.01678 0.00800
SMT-COMP 2015 Boolector Boolector SMT15 QF_BV final boolector_qf_bv unsat ✅ 0.01341 0.01200
CVC4 CVC4-master-2015-06-15-9b32405-main default unsat ✅ 0.03314 0.05099
CVC4-experimental-2015-06-15-ff5745a-main default unsat ✅ 0.03476 0.05499
MathSAT MathSat 5.3.6 main smtcomp2015_main unsat ✅ 0.04859 0.04799
SMT-RAT SMT-RAT-final default unsat ✅ 0.20390 0.20297
STP stp-cryptominisat4 default unsat ✅ 0.02480 0.02400
stp-cmsat4-v15 default unsat ✅ 0.02329 0.02200
stp-cmsat4-mt-v15 default unknown ❌ 0.03078 0.02999
stp-minisat-v15 default unsat ✅ 0.02356 0.02300
Yices2 Yices default unsat ✅ 0.00819 0.00300
Z3 z3 4.4.0 default unsat ✅ 0.03238 0.03199
SMT-COMP 2016 ABC ABC_default default_abc unsat ✅ 0.06893 0.06918
ABC_glucose glucose unsat ✅ 0.06785 0.06820
Boolector Boolector boolector unsat ✅ 0.02893 0.02935
Boolector preprop boolector unsat ✅ 0.03363 0.03364
CVC4 CVC4-master-2016-05-27-cfef263-main default unsat ✅ 0.03521 0.05735
MapleSTP MapleSTP default unsat ✅ 0.01623 0.01620
MapleSTP-mt default unsat ✅ 0.01778 0.02612
MathSAT mathsat-5.3.11-linux-x86_64-Main default unsat ✅ 0.03909 0.04001
MinkeyRink Minkeyrink 2016 default unsat ✅ 0.06696 0.07109
Q3B Q3B default unsat ✅ 0.06459 0.06581
STP stp-cms-exp-2016 default unsat ✅ 0.01587 0.01585
stp-cms-mt-2016 default unsat ✅ 0.01834 0.02644
stp-cms-st-2016 default unsat ✅ 0.01584 0.01580
stp-minisat-st-2016 default unsat ✅ 0.01508 0.01503
Yices2 Yices-2.4.2 default unsat ✅ 0.01297 0.00398
Z3 z3-4.4.1 default unsat ✅ 0.03047 0.03186
SMT-COMP 2017 0.12 (7/8) Boolector Boolector+CaDiCaL SMT17 final boolector unsat ✅ 0.03351 0.03308
Boolector SMT17 final boolector unsat ✅ 0.05480 0.05448
CVC4 CVC4-smtcomp2017-main default unsat ✅ 0.04003 0.06440
MathSAT mathsat-5.4.1-linux-x86_64-Main default unsat ✅ 0.04005 0.04024
MinkeyRink MinkeyRink 2017.3a default unsat ✅ 0.08885 0.04706
Q3B Q3B default unknown ❌ 0.32970 0.11325
STP stp_st default unsat ✅ 0.02492 0.02425
stp_mt default unsat ✅ 0.02739 0.03404
Yices2 Yices2-Main default unsat ✅ 0.00782 0.00352
Z3 z3-4.5.0 default unsat ✅ 0.03508 0.03446
SMT-COMP 2018 Boolector Boolector_default unsat ✅ 0.02616 0.02612
CVC4 master-2018-06-10-b19c840-competition-default_default unsat ✅ 0.08521 0.08530
MathSAT mathsat-5.5.2-linux-x86_64-Main_default unsat ✅ 0.03861 0.03949
MinkeyRink Minkeyrink MT_mt unsat ✅ 0.03550 0.03797
Minkeyrink ST_st unsat ✅ 0.03152 0.03163
STP STP-CMS-st-2018_default-no-stderr unsat ✅ 0.02121 0.02144
STP-CMS-mt-2018_multicore-no-stderr unsat ✅ 0.02164 0.02367
STP-Riss-st-2018_riss-no-stderr unsat ✅ 0.02786 0.02792
Yices2 Yices 2.6.0_default unsat ✅ 0.00869 0.00594
Z3 z3-4.7.1_default unsat ✅ 0.03625 0.03618