Benchmark

non-incremental/QF_BV/brummayerbiere/nlzbsdown032.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
Size	9987
Compressed Size	1524
License	Creative Commons Attribution 4.0 International (CC-BY-4.0)
Category	crafted
First Occurrence	2008-07-07
Generated By	—
Generated On	—
Generator	—
Dolmen OK	1
strict Dolmen OK	1
check-sat calls	1

Query 1

Status	unsat
Inferred Status	unsat
Size	9979
Compressed Size	1495
Max. Term Depth	87
Asserts	1
Declared Functions	0
Declared Constants	1
Declared Sorts	0
Defined Functions	0
Defined Recursive Functions	0
Defined Sorts	0
Constants	0
Declared Datatypes	0

Symbols

ite	112	not	6	=	108	let	77
bvnot	33	bvand	32	bvor	32	bvadd	32
bvsub	6	bvshl	32	bvlshr	5	zero_extend	32

Evaluations

Evaluation	Rating	Solver	Variant	Result	Wallclock	CPU Time
SMT Evaluation 2013		4Simp	4Simp-SMT-COMP-2012 default	unsat ✅	0.06760	—
		Abziz	abziz_portfolio_2011_minfeatures_2 default	unsat ✅	0.05934	—
			abziz_portfolio_2011_solvers_2 default	unsat ✅	0.04067	—
			abziz_portfolio_2012_minfeatures default	unsat ✅	0.04088	—
			abziz_portfolio_2012_solvers default	unsat ✅	0.04135	—
			AbzizPortfolio-SMT-COMP-2012 default	unsat ✅	0.04870	—
		Boolector	Boolector-1.5.118-SMT-EVAL-2013 default	unsat ✅	0.09213	—
			Boolector-SMT-COMP-2011 default	unsat ✅	0.21935	—
			Boolector-SMT-COMP-2012 default	unsat ✅	0.26543	—
		CVC3	CVC3-SMT-COMP-2010 default	unsat ✅	8.78349	—
			CVC3-SMT-COMP-2011 default	unsat ✅	8.24317	—
			CVC3-SMT-COMP-2012 default	unsat ✅	8.27009	—
		CVC4	CVC4-SMT-COMP-2012-Resubmission default	unsat ✅	0.14008	—
			CVC4-SMT-EVAL-2013 default	unsat ✅	0.23912	—
		MathSAT	MathSAT5-5.2.6-SMT-EVAL-2013 default	unsat ✅	0.29289	—
			MathSAT5-HeavyBV-SMT-COMP-2012 default	unsat ✅	0.77126	—
			MathSAT5-SMT-COMP-2011 default	unsat ✅	0.42578	—
			MathSAT5-SMT-COMP-2012 default	unsat ✅	0.51399	—
		SONOLAR	SONOLAR-2013-05-15-SMT-EVAL-2013 default	unsat ✅	0.03576	—
			SONOLAR-SMT-COMP-2010 default	unsat ✅	0.51019	—
			SONOLAR-SMT-COMP-2011 default	unsat ✅	0.05345	—
			SONOLAR-SMT-COMP-2012 default	unsat ✅	0.05200	—
		STP	STP2-SMT-COMP-2011 default	unsat ✅	0.04141	—
			STP2-SMT-COMP-2012 default	unsat ✅	0.06279	—
			simplifyingSTP-SMT-COMP-2010 default	unsat ✅	0.05823	—
		Z3	Z3-4.3.2.a054b099c1d6-x64-debian-6.0.6-SMT-EVAL-2013 default	unsat ✅	0.04633	—
			Z3-SMT-COMP-2011 default	unsat ✅	0.03519	—
SMT-COMP 2015		Boolector	Boolector SMT15 QF_BV final boolector_qf_bv	unsat ✅	0.15953	0.15898
		CVC4	CVC4-master-2015-06-15-9b32405-main default	unsat ✅	0.26625	0.51092
			CVC4-experimental-2015-06-15-ff5745a-main default	unsat ✅	0.26187	0.50392
		MathSAT	MathSat 5.3.6 main smtcomp2015_main	unsat ✅	0.31167	0.31095
		SMT-RAT	SMT-RAT-final default	unsat ✅	7.09209	7.09392
		STP	stp-cryptominisat4 default	unsat ✅	0.05633	0.05499
			stp-cmsat4-v15 default	unsat ✅	0.05317	0.05199
			stp-cmsat4-mt-v15 default	unknown ❌	0.05932	0.05799
			stp-minisat-v15 default	unsat ✅	0.05114	0.04999
		Yices2	Yices default	unsat ✅	0.02712	0.02600
		Z3	z3 4.4.0 default	unsat ✅	0.07009	0.06999
SMT-COMP 2016		ABC	ABC_default default_abc	unsat ✅	0.09827	0.09810
			ABC_glucose glucose	unsat ✅	0.24087	0.23960
		Boolector	Boolector boolector	unsat ✅	0.41162	0.41226
			Boolector preprop boolector	unsat ✅	0.42002	0.42026
		CVC4	CVC4-master-2016-05-27-cfef263-main default	unsat ✅	0.25644	0.49518
		MapleSTP	MapleSTP default	unsat ✅	0.05901	0.05899
			MapleSTP-mt default	unsat ✅	0.06537	0.14527
		MathSAT	mathsat-5.3.11-linux-x86_64-Main default	unsat ✅	0.32409	0.32518
		MinkeyRink	Minkeyrink 2016 default	unsat ✅	0.18225	0.23095
		Q3B	Q3B default	unsat ✅	0.14688	0.17069
		STP	stp-cms-exp-2016 default	unsat ✅	0.05897	0.05897
			stp-cms-mt-2016 default	unsat ✅	0.06205	0.13761
			stp-cms-st-2016 default	unsat ✅	0.05732	0.05730
			stp-minisat-st-2016 default	unsat ✅	0.08014	0.08016
		Yices2	Yices-2.4.2 default	unsat ✅	0.01399	0.01396
		Z3	z3-4.4.1 default	unsat ✅	0.06667	0.06799
SMT-COMP 2017		Boolector	Boolector+CaDiCaL SMT17 final boolector	unsat ✅	0.18568	0.17766
			Boolector SMT17 final boolector	unsat ✅	0.47345	0.47348
		CVC4	CVC4-smtcomp2017-main default	unsat ✅	0.32675	0.63158
		MathSAT	mathsat-5.4.1-linux-x86_64-Main default	unsat ✅	0.33688	0.33581
		MinkeyRink	MinkeyRink 2017.3a default	unsat ✅	0.13054	0.08707
		Q3B	Q3B default	unsat ✅	0.16648	0.14728
		STP	stp_st default	unsat ✅	0.07682	0.07685
			stp_mt default	unsat ✅	0.11868	0.13726
		Yices2	Yices2-Main default	unsat ✅	0.01679	0.01524
		Z3	z3-4.5.0 default	unsat ✅	0.08549	0.07554
SMT-COMP 2018		Boolector	Boolector_default	unsat ✅	0.14297	0.14294
		CVC4	master-2018-06-10-b19c840-competition-default_default	unsat ✅	0.72331	0.72347
		MathSAT	mathsat-5.5.2-linux-x86_64-Main_default	unsat ✅	0.31006	0.31108
		MinkeyRink	Minkeyrink MT_mt	unsat ✅	0.06038	0.08005
			Minkeyrink ST_st	unsat ✅	0.05626	0.05647
		STP	STP-CMS-st-2018_default-no-stderr	unsat ✅	0.05328	0.05333
			STP-CMS-mt-2018_multicore-no-stderr	unsat ✅	0.05829	0.08141
			STP-Riss-st-2018_riss-no-stderr	unsat ✅	0.20139	0.20142
		Yices2	Yices 2.6.0_default	unsat ✅	0.01689	0.01683
		Z3	z3-4.7.1_default	unsat ✅	0.07184	0.07176