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