llvm/llvm/unittests/Analysis/IVDescriptorsTest.cpp

//===- IVDescriptorsTest.cpp - IVDescriptors unit tests -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/IVDescriptors.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"

usingnamespacellvm;

/// Build the loop info and scalar evolution for the function and run the Test.
static void runWithLoopInfoAndSE(
    Module &M, StringRef FuncName,
    function_ref<void(Function &F, LoopInfo &LI, ScalarEvolution &SE)> Test) { … }

static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) { … }

// This tests that IVDescriptors can obtain the induction binary operator for
// integer induction variables. And getExactFPMathInst() correctly return the
// expected behavior, i.e. no FMF algebra.
TEST(IVDescriptorsTest, LoopWithSingleLatch) { … }

// Depending on how SCEV deals with ptrtoint cast, the step of a phi could be
// a pointer, and InductionDescriptor used to fail with an assertion.
// So just check that it doesn't assert.
TEST(IVDescriptorsTest, LoopWithPtrToInt) { … }

// This tests that correct identity value is returned for a RecurrenceDescriptor
// that describes FMin reduction idiom.
TEST(IVDescriptorsTest, FMinRednIdentity) { … }

// This tests that correct identity value is returned for a RecurrenceDescriptor
// that describes FMax reduction idiom.
TEST(IVDescriptorsTest, FMaxRednIdentity) { … }