forked from OSchip/llvm-project
101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
//===- IVDescriptorsTest.cpp - IVDescriptors 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/IVDescriptors.h"
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#include "llvm/Analysis/AssumptionCache.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/Support/SourceMgr.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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/// Build the loop info and scalar evolution for the function and run the Test.
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static void runWithLoopInfoAndSE(
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Module &M, StringRef FuncName,
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function_ref<void(Function &F, LoopInfo &LI, ScalarEvolution &SE)> Test) {
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auto *F = M.getFunction(FuncName);
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ASSERT_NE(F, nullptr) << "Could not find " << FuncName;
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TargetLibraryInfoImpl TLII;
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TargetLibraryInfo TLI(TLII);
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AssumptionCache AC(*F);
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DominatorTree DT(*F);
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LoopInfo LI(DT);
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ScalarEvolution SE(*F, TLI, AC, DT, LI);
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Test(*F, LI, SE);
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}
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static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
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SMDiagnostic Err;
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std::unique_ptr<Module> Mod = parseAssemblyString(IR, Err, C);
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if (!Mod)
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Err.print("IVDescriptorsTests", errs());
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return Mod;
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}
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// This tests that IVDescriptors can obtain the induction binary operator for
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// integer induction variables. And hasUnsafeAlgebra() and
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// getUnsafeAlgebraInst() correctly return the expected behavior, i.e. no unsafe
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// algebra.
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TEST(IVDescriptorsTest, LoopWithSingleLatch) {
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// Parse the module.
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LLVMContext Context;
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std::unique_ptr<Module> M = parseIR(
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Context,
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R"(define void @foo(i32* %A, i32 %ub) {
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entry:
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br label %for.body
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for.body:
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%i = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%idxprom = sext i32 %i to i64
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%arrayidx = getelementptr inbounds i32, i32* %A, i64 %idxprom
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store i32 %i, i32* %arrayidx, align 4
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%inc = add nsw i32 %i, 1
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%cmp = icmp slt i32 %inc, %ub
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br i1 %cmp, label %for.body, label %for.exit
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for.exit:
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br label %for.end
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for.end:
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ret void
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})"
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);
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runWithLoopInfoAndSE(
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*M, "foo", [&](Function &F, LoopInfo &LI, ScalarEvolution &SE) {
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Function::iterator FI = F.begin();
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// First basic block is entry - skip it.
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BasicBlock *Header = &*(++FI);
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assert(Header->getName() == "for.body");
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Loop *L = LI.getLoopFor(Header);
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EXPECT_NE(L, nullptr);
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PHINode *Inst_i = dyn_cast<PHINode>(&Header->front());
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assert(Inst_i->getName() == "i");
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InductionDescriptor IndDesc;
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bool IsInductionPHI =
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InductionDescriptor::isInductionPHI(Inst_i, L, &SE, IndDesc);
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EXPECT_TRUE(IsInductionPHI);
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Instruction *Inst_inc = nullptr;
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BasicBlock::iterator BBI = Header->begin();
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do {
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if ((&*BBI)->getName() == "inc")
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Inst_inc = &*BBI;
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++BBI;
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} while (!Inst_inc);
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assert(Inst_inc->getName() == "inc");
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EXPECT_EQ(IndDesc.getInductionBinOp(), Inst_inc);
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EXPECT_FALSE(IndDesc.hasUnsafeAlgebra());
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EXPECT_EQ(IndDesc.getUnsafeAlgebraInst(), nullptr);
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});
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}
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