algotune: finish library.

.vscode/settings.json

@@ -4,5 +4,6 @@
 	],
 	"files.associations": {
 		"*.ipp": "c"
-	}
+	},
+	"python.linting.enabled": false
 }

misc/algotest/Makefile.am

@@ -2,6 +2,7 @@ AM_CPPFLAGS  =	-Wall -Wextra -pedantic -Wshadow -Wpointer-arith -Wcast-align
 AM_CPPFLAGS +=	-Wwrite-strings -Wmissing-declarations -Wno-long-long -Werror
 AM_CPPFLAGS +=	-Wunused-variable -std=c++14 -D_XOPEN_SOURCE -O2 -I.
 AM_CPPFLAGS +=	-fno-elide-constructors	 -Weffc++
+ACLOCAL_AMFLAGS = -I m4
 
 pkgconfigdir =			$(libdir)/pkgconfig
 pkgconfig_DATA =		libalgotune-1.pc
@@ -9,3 +10,7 @@ pkgconfig_DATA =		libalgotune-1.pc
 lib_LTLIBRARIES =		libalgotune.la
 nobase_include_HEADERS =	algotune.h
 libalgotune_la_SOURCES =	algotune.cc
+
+check_PROGRAMS =		algotune_test
+algotune_test_SOURCES =		algotune_test.cc
+algotune_test_LDADD =		libalgotune.la

misc/algotest/algotune.cc

@@ -1,3 +1,5 @@
+#include <cassert>
+#include <iostream>
 #include <random>
 #include <vector>
 
@@ -5,45 +7,110 @@
 
 namespace algotune {
 
+
+static std::mt19937		rng;
+static std::random_device	devrand;
+
+
+static void
+reseed()
+{
+	rng.seed(devrand());
+}
+
+
 int
 rand_int(int low, int high)
 {
-	return -1;
+	std::uniform_int_distribution<int>	dist(low, high);
+	return dist(rng);
 }
 
 
 int64_t
-rand_int(int64_t low, int64_t high)
+rand_int64(int64_t low, int64_t high)
 {
-	return -1;
+	std::uniform_int_distribution<int64_t>	dist(low, high);
+	return dist(rng);
 }
 
 
 std::vector<int>
 gen_int_vector(int size, int low, int high)
 {
-	return vector<int>(0);
+	assert(low < high);
+	reseed();
+	std::vector<int> v(size);
+
+	for (int i = 0; i < size; i++) {
+		v[i] = rand_int(low, high);
+	}
+
+	return v;
 }
 
 
 std::vector<int64_t>
-gen_int_vector(int size, int low, int high)
+gen_int64_vector(int64_t size, int64_t low, int64_t high)
 {
-	return vector<int64_t>(0);
+	assert(low < high);
+	reseed();
+	std::vector<int64_t> v(size);
+
+	for (int64_t i = 0; i < size; i++) {
+		v[i] = rand_int64(low, high);
+	}
+
+	return v;
 }
 
 
-void
+int64_t
-stress_test_int(bool(*func)(std::vector<int>))
+stress_test_int(bool(*func)(std::vector<int>&), int size, int low, int high)
 {
+	assert(func != nullptr);
+	std::vector<int>	v;
+	bool			result = true;
+	int64_t			iterations = 0;
+	int			vsize = 0;
 
+	while (result) {
+		iterations++;
+		vsize = rand_int(0, size);
+		v = gen_int_vector(vsize, low, high);
+		result = func(v);
+
+		if ((iterations > 1) && ((iterations % display_step) == 0)) {
+			std::cout << "Iteration: " << iterations << std::endl;
+		}
+	}
+
+	return iterations;
 }
 
 
-void
+int64_t
-stress_test_int64(bool(*func)(std::vector<int64_t))
+stress_test_int64(bool(*func)(std::vector<int64_t>&), int64_t size, int64_t low, int64_t high)
 {
+	assert(func != nullptr);
+	std::vector<int64_t>	v;
+	bool			result = true;
+	int64_t			iterations = 0;
+	int64_t			vsize = 0;
 
+	while (result) {
+		iterations++;
+		vsize = rand_int64(0, size);
+		v = gen_int64_vector(vsize, low, high);
+		result = func(v);
+
+		if ((iterations > 1) && ((iterations % display_step) == 0)) {
+			std::cout << "Iteration: " << iterations << std::endl;
 		}
+	}
+
+	return iterations;
+}
+
 
 } // namespace algotune

misc/algotest/algotune.h

@@ -5,14 +5,18 @@
 
 namespace algotune {
 
+int64_t			display_step = 1000;
+
+
+
 int			rand_int(int low, int high);
-int64_t			rand_int(int64_t low, int64_t high);
+int64_t			rand_int64(int64_t low, int64_t high);
 
 std::vector<int>	gen_int_vector(int size, int low, int high);
-std::vector<int64_t>	gen_int_vector(int size, int low, int high);
+std::vector<int64_t>	gen_int64_vector(int64_t size, int64_t low, int64_t high);
 
-void			stress_test_int(bool(*func)(std::vector<int>));
+int64_t			stress_test_int(bool(*func)(std::vector<int>&), int size, int low, int high);
-void			stress_test_int64(bool(*func)(std::vector<int64_t));
+int64_t			stress_test_int64(bool(*func)(std::vector<int64_t>&), int64_t size, int64_t low, int64_t high);
 
 } // namespace algotune
 

misc/algotest/algotune_test.cc

@@ -0,0 +1,74 @@
+#include <iostream>
+#include <vector>
+
+#include "algotune.h"
+
+using namespace std;
+
+
+static int64_t
+max_pairwise_fast(vector<int> &v)
+{
+	size_t idx1 = 0;
+	size_t idx2 = 0;
+	auto n = v.size();
+
+	for (size_t i = 1; i < n; i++) {
+		if (v[i] > v[idx1]) {
+			idx1 = i;
+		}
+	}
+
+	for (size_t i = 1; i < n; i++) {
+		if (i == idx1) continue;
+		if ((v[i] > v[idx2]) || (idx2 == idx1)) {
+			idx2 = i;
+		}
+	}
+
+	return 	static_cast<int64_t>(v[idx1]) * static_cast<int64_t>(v[idx2]);
+}
+
+
+static int64_t
+max_pairwise_naive(vector<int> &v)
+{
+	auto n = v.size();
+	int64_t best = 0;
+
+	for (size_t i = 0; i < n; i++) {
+		for (size_t j = 0; j < n; j++) {
+			if (i == j) continue;
+			int64_t prod = v[i] * v[j];
+			best = prod > best ? prod : best;
+		}
+	}
+
+	return best;
+}
+
+
+static bool
+test_max_pairwise_fast(vector<int> &v)
+{
+	auto result_fast = max_pairwise_fast(v);
+	auto result_naive = max_pairwise_naive(v);
+
+	return result_fast == result_naive;
+}
+
+
+int
+main(void)
+{
+	vector<int> v = algotune::gen_int_vector(10, 1, 10000);
+	if (!test_max_pairwise_fast(v)) {
+		cerr << "test failed\n";
+		return 1;
+	}
+
+	algotune::display_step = 100;
+	auto iterations = algotune::stress_test_int(test_max_pairwise_fast, 10000, 1, 1000000);
+	cout << "Iterations before failure: " << iterations << endl;
+	return 0;
+}

misc/algotest/configure.ac

@@ -1,10 +1,10 @@
-AC_PREREQ([2.68])
+AC_PREREQ([2.69])
 AC_INIT([libalgotune],
 	[1.0.0],
 	[kyle@imap.cc],
 	[],
 	[])
-AM_INIT_AUTOMAKE([1.11 foreign])
+AM_INIT_AUTOMAKE([1.15 foreign])
 
 LT_INIT
 
@@ -13,10 +13,10 @@ PKG_PROG_PKG_CONFIG
 AC_CONFIG_SRCDIR([algotune.h])
 AC_CONFIG_FILES([Makefile
                  libalgotune-1.pc])
+AC_CONFIG_MACRO_DIR([m4])
 
 AC_PROG_CXX
 AC_PROG_INSTALL
 AC_PROG_CC_C_O
 
 AC_OUTPUT
-