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The `BlockFrequency` class abstracts `uint64_t` frequency values. Use it more consistently in various APIs and disable implicit conversion to make usage more consistent and explicit. - Use `BlockFrequency Freq` parameter for `setBlockFreq`, `getProfileCountFromFreq` and `setBlockFreqAndScale` functions. - Return `BlockFrequency` in `getEntryFreq()` functions. - While on it change some `const BlockFrequency& Freq` parameters to plain `BlockFreqency Freq`. - Mark `BlockFrequency(uint64_t)` constructor as explicit. - Add missing `BlockFrequency::operator!=`. - Remove `uint64_t BlockFreqency::getMaxFrequency()`. - Add `BlockFrequency BlockFrequency::max()` function.
99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
//===- BlockFrequencyInfoTest.cpp - BlockFrequencyInfo unit 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/Analysis/BlockFrequencyInfo.h"
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#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
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#include "llvm/Analysis/BranchProbabilityInfo.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include "gtest/gtest.h"
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namespace llvm {
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namespace {
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class BlockFrequencyInfoTest : public testing::Test {
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protected:
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std::unique_ptr<BranchProbabilityInfo> BPI;
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std::unique_ptr<DominatorTree> DT;
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std::unique_ptr<LoopInfo> LI;
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LLVMContext C;
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BlockFrequencyInfo buildBFI(Function &F) {
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DT.reset(new DominatorTree(F));
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LI.reset(new LoopInfo(*DT));
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BPI.reset(new BranchProbabilityInfo(F, *LI));
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return BlockFrequencyInfo(F, *BPI, *LI);
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}
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std::unique_ptr<Module> makeLLVMModule() {
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const char *ModuleStrig = "define i32 @f(i32 %x) {\n"
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"bb0:\n"
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" %y1 = icmp eq i32 %x, 0 \n"
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" br i1 %y1, label %bb1, label %bb2 \n"
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"bb1:\n"
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" br label %bb3\n"
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"bb2:\n"
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" br label %bb3\n"
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"bb3:\n"
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" %y2 = phi i32 [0, %bb1], [1, %bb2] \n"
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" ret i32 %y2\n"
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"}\n";
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SMDiagnostic Err;
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return parseAssemblyString(ModuleStrig, Err, C);
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}
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};
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TEST_F(BlockFrequencyInfoTest, Basic) {
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auto M = makeLLVMModule();
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Function *F = M->getFunction("f");
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F->setEntryCount(100);
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BlockFrequencyInfo BFI = buildBFI(*F);
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BasicBlock &BB0 = F->getEntryBlock();
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BasicBlock *BB1 = BB0.getTerminator()->getSuccessor(0);
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BasicBlock *BB2 = BB0.getTerminator()->getSuccessor(1);
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BasicBlock *BB3 = BB1->getSingleSuccessor();
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uint64_t BB0Freq = BFI.getBlockFreq(&BB0).getFrequency();
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uint64_t BB1Freq = BFI.getBlockFreq(BB1).getFrequency();
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uint64_t BB2Freq = BFI.getBlockFreq(BB2).getFrequency();
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uint64_t BB3Freq = BFI.getBlockFreq(BB3).getFrequency();
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EXPECT_EQ(BB0Freq, BB3Freq);
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EXPECT_EQ(BB0Freq, BB1Freq + BB2Freq);
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EXPECT_EQ(BB0Freq, BB3Freq);
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EXPECT_EQ(*BFI.getBlockProfileCount(&BB0), UINT64_C(100));
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EXPECT_EQ(*BFI.getBlockProfileCount(BB3), UINT64_C(100));
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EXPECT_EQ(*BFI.getBlockProfileCount(BB1),
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(100 * BB1Freq + BB0Freq / 2) / BB0Freq);
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EXPECT_EQ(*BFI.getBlockProfileCount(BB2),
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(100 * BB2Freq + BB0Freq / 2) / BB0Freq);
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// Scale the frequencies of BB0, BB1 and BB2 by a factor of two.
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SmallPtrSet<BasicBlock *, 4> BlocksToScale({BB1, BB2});
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BFI.setBlockFreqAndScale(&BB0, BlockFrequency(BB0Freq * 2), BlocksToScale);
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EXPECT_EQ(BFI.getBlockFreq(&BB0).getFrequency(), 2 * BB0Freq);
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EXPECT_EQ(BFI.getBlockFreq(BB1).getFrequency(), 2 * BB1Freq);
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EXPECT_EQ(BFI.getBlockFreq(BB2).getFrequency(), 2 * BB2Freq);
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EXPECT_EQ(BFI.getBlockFreq(BB3).getFrequency(), BB3Freq);
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}
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static_assert(std::is_trivially_copyable_v<bfi_detail::BlockMass>,
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"trivially copyable");
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} // end anonymous namespace
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} // end namespace llvm
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