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