cd4edf94cd
This patch recommits "[ConstraintSystem] Add helpers to deal with linear constraints." (it reverts the revert commit 8da6ae4ce1b686c5c13698e4c5ee937811fda6f7). The reason for the revert was using __builtin_multiply_overflow, which is not available for all compilers. The patch has been updated to use MulOverflow from MathExtras.h
83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
//===--- ConstraintSystemTests.cpp ----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/ConstraintSystem.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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TEST(ConstraintSloverTest, TestSolutionChecks) {
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{
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ConstraintSystem CS;
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// x + y <= 10, x >= 5, y >= 6, x <= 10, y <= 10
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CS.addVariableRow({10, 1, 1});
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CS.addVariableRow({-5, -1, 0});
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CS.addVariableRow({-6, 0, -1});
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CS.addVariableRow({10, 1, 0});
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CS.addVariableRow({10, 0, 1});
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EXPECT_FALSE(CS.mayHaveSolution());
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}
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{
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ConstraintSystem CS;
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// x + y <= 10, x >= 2, y >= 3, x <= 10, y <= 10
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CS.addVariableRow({10, 1, 1});
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CS.addVariableRow({-2, -1, 0});
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CS.addVariableRow({-3, 0, -1});
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CS.addVariableRow({10, 1, 0});
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CS.addVariableRow({10, 0, 1});
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EXPECT_TRUE(CS.mayHaveSolution());
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}
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{
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ConstraintSystem CS;
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// x + y <= 10, 10 >= x, 10 >= y; does not have a solution.
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CS.addVariableRow({10, 1, 1});
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CS.addVariableRow({-10, -1, 0});
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CS.addVariableRow({-10, 0, -1});
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EXPECT_FALSE(CS.mayHaveSolution());
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}
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{
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ConstraintSystem CS;
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// x + y >= 20, 10 >= x, 10 >= y; does HAVE a solution.
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CS.addVariableRow({-20, -1, -1});
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CS.addVariableRow({-10, -1, 0});
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CS.addVariableRow({-10, 0, -1});
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EXPECT_TRUE(CS.mayHaveSolution());
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}
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{
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ConstraintSystem CS;
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// 2x + y + 3z <= 10, 2x + y >= 10, y >= 1
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CS.addVariableRow({10, 2, 1, 3});
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CS.addVariableRow({-10, -2, -1, 0});
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CS.addVariableRow({-1, 0, 0, -1});
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EXPECT_FALSE(CS.mayHaveSolution());
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}
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{
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ConstraintSystem CS;
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// 2x + y + 3z <= 10, 2x + y >= 10
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CS.addVariableRow({10, 2, 1, 3});
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CS.addVariableRow({-10, -2, -1, 0});
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EXPECT_TRUE(CS.mayHaveSolution());
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}
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}
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} // namespace
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