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Diffstat (limited to 'libs/ezsat/demo_cmp.cc')
| -rw-r--r-- | libs/ezsat/demo_cmp.cc | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/libs/ezsat/demo_cmp.cc b/libs/ezsat/demo_cmp.cc new file mode 100644 index 00000000..b2df8a8d --- /dev/null +++ b/libs/ezsat/demo_cmp.cc @@ -0,0 +1,146 @@ +/* + * ezSAT -- A simple and easy to use CNF generator for SAT solvers + * + * Copyright (C) 2013 Clifford Wolf <clifford@clifford.at> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + */ + +#include "ezminisat.h" +#include <assert.h> + +#define INIT_X 123456789 +#define INIT_Y 362436069 +#define INIT_Z 521288629 +#define INIT_W 88675123 + +uint32_t xorshift128() { + static uint32_t x = INIT_X; + static uint32_t y = INIT_Y; + static uint32_t z = INIT_Z; + static uint32_t w = INIT_W; + uint32_t t = x ^ (x << 11); + x = y; y = z; z = w; + w ^= (w >> 19) ^ t ^ (t >> 8); + return w; +} + +void test_cmp(uint32_t a, uint32_t b) +{ + ezMiniSAT sat; + + printf("A = %10u (%10d)\n", a, int32_t(a)); + printf("B = %10u (%10d)\n", b, int32_t(b)); + printf("\n"); + + std::vector<int> va = sat.vec_var("a", 32); + std::vector<int> vb = sat.vec_var("b", 32); + + sat.vec_set_unsigned(va, a); + sat.vec_set_unsigned(vb, b); + +#define MONITOR_VARS \ + X(carry) X(overflow) X(sign) X(zero) \ + X(lt_signed) X(le_signed) X(ge_signed) X(gt_signed) \ + X(lt_unsigned) X(le_unsigned) X(ge_unsigned) X(gt_unsigned) + +#define X(_n) int _n; bool _n ## _master; + MONITOR_VARS +#undef X + + carry_master = ((uint64_t(a) - uint64_t(b)) >> 32) & 1; + overflow_master = (int32_t(a) - int32_t(b)) != (int64_t(int32_t(a)) - int64_t(int32_t(b))); + sign_master = ((a - b) >> 31) & 1; + zero_master = a == b; + + sat.vec_cmp(va, vb, carry, overflow, sign, zero); + + lt_signed_master = int32_t(a) < int32_t(b); + le_signed_master = int32_t(a) <= int32_t(b); + ge_signed_master = int32_t(a) >= int32_t(b); + gt_signed_master = int32_t(a) > int32_t(b); + + lt_unsigned_master = a < b; + le_unsigned_master = a <= b; + ge_unsigned_master = a >= b; + gt_unsigned_master = a > b; + + lt_signed = sat.vec_lt_signed(va, vb); + le_signed = sat.vec_le_signed(va, vb); + ge_signed = sat.vec_ge_signed(va, vb); + gt_signed = sat.vec_gt_signed(va, vb); + + lt_unsigned = sat.vec_lt_unsigned(va, vb); + le_unsigned = sat.vec_le_unsigned(va, vb); + ge_unsigned = sat.vec_ge_unsigned(va, vb); + gt_unsigned = sat.vec_gt_unsigned(va, vb); + + std::vector<int> modelExpressions; + std::vector<bool> modelValues, modelMaster; + std::vector<std::string> modelNames; + +#define X(_n) modelExpressions.push_back(_n); modelNames.push_back(#_n); modelMaster.push_back(_n ## _master); + MONITOR_VARS +#undef X + + std::vector<int> add_ab = sat.vec_add(va, vb); + std::vector<int> sub_ab = sat.vec_sub(va, vb); + std::vector<int> sub_ba = sat.vec_sub(vb, va); + + sat.vec_append(modelExpressions, add_ab); + sat.vec_append(modelExpressions, sub_ab); + sat.vec_append(modelExpressions, sub_ba); + + if (!sat.solve(modelExpressions, modelValues)) { + fprintf(stderr, "SAT solver failed to find a model!\n"); + abort(); + } + + bool found_error = false; + + for (size_t i = 0; i < modelMaster.size(); i++) { + if (modelMaster.at(i) != int(modelValues.at(i))) + found_error = true; + printf("%-20s %d%s\n", modelNames.at(i).c_str(), int(modelValues.at(i)), + modelMaster.at(i) != modelValues.at(i) ? " !!!" : ""); + } + printf("\n"); + + uint32_t add_ab_value = sat.vec_model_get_unsigned(modelExpressions, modelValues, add_ab); + uint32_t sub_ab_value = sat.vec_model_get_unsigned(modelExpressions, modelValues, sub_ab); + uint32_t sub_ba_value = sat.vec_model_get_unsigned(modelExpressions, modelValues, sub_ba); + + printf("%-20s %10u %10u%s\n", "result(a+b)", add_ab_value, a+b, add_ab_value != a+b ? " !!!" : ""); + printf("%-20s %10u %10u%s\n", "result(a-b)", sub_ab_value, a-b, sub_ab_value != a-b ? " !!!" : ""); + printf("%-20s %10u %10u%s\n", "result(b-a)", sub_ba_value, b-a, sub_ba_value != b-a ? " !!!" : ""); + printf("\n"); + + if (found_error || add_ab_value != a+b || sub_ab_value != a-b || sub_ba_value != b-a) + abort(); +} + +int main() +{ + printf("\n"); + for (int i = 0; i < 1024; i++) { + printf("************** %d **************\n\n", i); + uint32_t a = xorshift128(); + uint32_t b = xorshift128(); + if (xorshift128() % 16 == 0) + a = b; + test_cmp(a, b); + } + return 0; +} + |