forked from OSchip/llvm-project
128 lines
3.5 KiB
C++
128 lines
3.5 KiB
C++
//===- unittests/Support/BlockFrequencyTest.cpp - BlockFrequency 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/BlockFrequency.h"
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#include "llvm/Support/BranchProbability.h"
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#include "llvm/Support/DataTypes.h"
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#include "gtest/gtest.h"
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#include <climits>
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using namespace llvm;
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namespace {
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TEST(BlockFrequencyTest, OneToZero) {
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BlockFrequency Freq(1);
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BranchProbability Prob(UINT32_MAX / 3, UINT32_MAX);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), 0u);
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Freq = BlockFrequency(1);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), 0u);
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}
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TEST(BlockFrequencyTest, OneToOne) {
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BlockFrequency Freq(1);
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BranchProbability Prob(UINT32_MAX, UINT32_MAX);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), 1u);
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Freq = BlockFrequency(1);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), 1u);
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}
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TEST(BlockFrequencyTest, ThreeToOne) {
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BlockFrequency Freq(3);
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BranchProbability Prob(3000000, 9000000);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), 1u);
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Freq = BlockFrequency(3);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), 1u);
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}
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TEST(BlockFrequencyTest, MaxToHalfMax) {
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BlockFrequency Freq(UINT64_MAX);
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BranchProbability Prob(UINT32_MAX / 2, UINT32_MAX);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), 9223372036854775807ULL);
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Freq = BlockFrequency(UINT64_MAX);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), 9223372036854775807ULL);
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}
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TEST(BlockFrequencyTest, BigToBig) {
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const uint64_t Big = 387246523487234346LL;
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const uint32_t P = 123456789;
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BlockFrequency Freq(Big);
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BranchProbability Prob(P, P);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), Big);
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Freq = BlockFrequency(Big);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), Big);
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}
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TEST(BlockFrequencyTest, MaxToMax) {
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BlockFrequency Freq(UINT64_MAX);
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BranchProbability Prob(UINT32_MAX, UINT32_MAX);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
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// This additionally makes sure if we have a value equal to our saturating
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// value, we do not signal saturation if the result equals said value, but
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// saturating does not occur.
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Freq = BlockFrequency(UINT64_MAX);
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Freq *= Prob;
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EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
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}
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TEST(BlockFrequencyTest, Subtract) {
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BlockFrequency Freq1(0), Freq2(1);
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EXPECT_EQ((Freq1 - Freq2).getFrequency(), 0u);
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EXPECT_EQ((Freq2 - Freq1).getFrequency(), 1u);
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}
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TEST(BlockFrequency, Divide) {
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BlockFrequency Freq(0x3333333333333333ULL);
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Freq /= BranchProbability(1, 2);
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EXPECT_EQ(Freq.getFrequency(), 0x6666666666666666ULL);
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}
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TEST(BlockFrequencyTest, Saturate) {
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BlockFrequency Freq(0x3333333333333333ULL);
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Freq /= BranchProbability(100, 300);
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EXPECT_EQ(Freq.getFrequency(), 0x9999999866666668ULL);
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Freq /= BranchProbability(1, 2);
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EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
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Freq = 0x1000000000000000ULL;
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Freq /= BranchProbability(10000, 170000);
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EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
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// Try to cheat the multiplication overflow check.
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Freq = 0x00000001f0000001ull;
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Freq /= BranchProbability(1000, 0xf000000f);
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EXPECT_EQ(33527736066704712ULL, Freq.getFrequency());
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}
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TEST(BlockFrequencyTest, SaturatingRightShift) {
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BlockFrequency Freq(0x10080ULL);
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Freq >>= 2;
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EXPECT_EQ(Freq.getFrequency(), 0x4020ULL);
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Freq >>= 20;
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EXPECT_EQ(Freq.getFrequency(), 0x1ULL);
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}
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}
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