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5d8e9991c3
This patch makes the operations on InstructionCost saturate, so that when costs are accumulated they saturate to <max value>. One of the compelling reasons for wanting to have saturation support is because in various places, arbitrary values are used to represent a 'high' cost, but when accumulating the cost of some set of operations or a loop, overflow is not taken into account, which may lead to unexpected results. By defining the operations to saturate, we can express the cost of something 'very expensive' as InstructionCost::getMax(). Reviewed By: kparzysz, dmgreen Differential Revision: https://reviews.llvm.org/D105108
96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
//===- InstructionCostTest.cpp - InstructionCost tests --------------------===//
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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/Support/InstructionCost.h"
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#include "gtest/gtest.h"
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#include <limits>
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using namespace llvm;
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namespace {
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struct CostTest : public testing::Test {
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CostTest() {}
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};
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} // namespace
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TEST_F(CostTest, DefaultCtor) {
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InstructionCost DefaultCost;
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ASSERT_TRUE(DefaultCost.isValid());
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EXPECT_EQ(*(DefaultCost.getValue()), 0);
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}
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TEST_F(CostTest, Operators) {
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InstructionCost VThree = 3;
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InstructionCost VNegTwo = -2;
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InstructionCost VSix = 6;
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InstructionCost IThreeA = InstructionCost::getInvalid(3);
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InstructionCost IThreeB = InstructionCost::getInvalid(3);
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InstructionCost ITwo = InstructionCost::getInvalid(2);
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InstructionCost TmpCost;
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EXPECT_NE(VThree, VNegTwo);
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EXPECT_GT(VThree, VNegTwo);
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EXPECT_NE(VThree, IThreeA);
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EXPECT_EQ(IThreeA, IThreeB);
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EXPECT_GE(IThreeA, VNegTwo);
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EXPECT_LT(VSix, IThreeA);
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EXPECT_LT(VThree, ITwo);
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EXPECT_GE(ITwo, VThree);
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EXPECT_EQ(VSix - IThreeA, IThreeB);
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EXPECT_EQ(VThree - VNegTwo, 5);
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EXPECT_EQ(VThree * VNegTwo, -6);
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EXPECT_EQ(VSix / VThree, 2);
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EXPECT_NE(IThreeA, ITwo);
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EXPECT_LT(ITwo, IThreeA);
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EXPECT_GT(IThreeA, ITwo);
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EXPECT_FALSE(IThreeA.isValid());
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EXPECT_EQ(IThreeA.getState(), InstructionCost::Invalid);
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TmpCost = VThree + IThreeA;
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EXPECT_FALSE(TmpCost.isValid());
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// Test increments, decrements
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EXPECT_EQ(++VThree, 4);
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EXPECT_EQ(VThree++, 4);
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EXPECT_EQ(VThree, 5);
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EXPECT_EQ(--VThree, 4);
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EXPECT_EQ(VThree--, 4);
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EXPECT_EQ(VThree, 3);
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TmpCost = VThree * IThreeA;
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EXPECT_FALSE(TmpCost.isValid());
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// Test value extraction
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EXPECT_EQ(*(VThree.getValue()), 3);
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EXPECT_EQ(IThreeA.getValue(), None);
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EXPECT_EQ(std::min(VThree, VNegTwo), -2);
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EXPECT_EQ(std::max(VThree, VSix), 6);
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// Test saturation
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auto Max = InstructionCost::getMax();
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auto Min = InstructionCost::getMin();
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auto MinusOne = InstructionCost(-1);
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auto MinusTwo = InstructionCost(-2);
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auto One = InstructionCost(1);
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auto Two = InstructionCost(2);
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EXPECT_EQ(Max + One, Max);
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EXPECT_EQ(Min + MinusOne, Min);
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EXPECT_EQ(Min - One, Min);
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EXPECT_EQ(Max - MinusOne, Max);
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EXPECT_EQ(Max * Two, Max);
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EXPECT_EQ(Min * Two, Min);
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EXPECT_EQ(Max * MinusTwo, Min);
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EXPECT_EQ(Min * MinusTwo, Max);
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}
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