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214 lines
7.6 KiB
C++
214 lines
7.6 KiB
C++
//===- LoopInfoTest.cpp - LoopInfo unit tests -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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/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 for the function and run the Test.
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static void
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runWithLoopInfo(Module &M, StringRef FuncName,
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function_ref<void(Function &F, LoopInfo &LI)> 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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// Compute the dominator tree and the loop info for the function.
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DominatorTree DT(*F);
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LoopInfo LI(DT);
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Test(*F, LI);
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}
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static std::unique_ptr<Module> makeLLVMModule(LLVMContext &Context,
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const char *ModuleStr) {
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SMDiagnostic Err;
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return parseAssemblyString(ModuleStr, Err, Context);
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}
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// This tests that for a loop with a single latch, we get the loop id from
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// its only latch, even in case the loop may not be in a simplified form.
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TEST(LoopInfoTest, LoopWithSingleLatch) {
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const char *ModuleStr =
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"target datalayout = \"e-m:o-i64:64-f80:128-n8:16:32:64-S128\"\n"
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"define void @foo(i32 %n) {\n"
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"entry:\n"
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" br i1 undef, label %for.cond, label %for.end\n"
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"for.cond:\n"
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" %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]\n"
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" %cmp = icmp slt i32 %i.0, %n\n"
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" br i1 %cmp, label %for.inc, label %for.end\n"
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"for.inc:\n"
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" %inc = add nsw i32 %i.0, 1\n"
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" br label %for.cond, !llvm.loop !0\n"
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"for.end:\n"
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" ret void\n"
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"}\n"
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"!0 = distinct !{!0, !1}\n"
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"!1 = !{!\"llvm.loop.distribute.enable\", i1 true}\n";
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// Parse the module.
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LLVMContext Context;
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std::unique_ptr<Module> M = makeLLVMModule(Context, ModuleStr);
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runWithLoopInfo(*M, "foo", [&](Function &F, LoopInfo &LI) {
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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.cond");
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Loop *L = LI.getLoopFor(Header);
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// This loop is not in simplified form.
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EXPECT_FALSE(L->isLoopSimplifyForm());
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// Analyze the loop metadata id.
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bool loopIDFoundAndSet = false;
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// Try to get and set the metadata id for the loop.
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if (MDNode *D = L->getLoopID()) {
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L->setLoopID(D);
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loopIDFoundAndSet = true;
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}
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// We must have successfully found and set the loop id in the
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// only latch the loop has.
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EXPECT_TRUE(loopIDFoundAndSet);
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});
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}
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// Test loop id handling for a loop with multiple latches.
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TEST(LoopInfoTest, LoopWithMultipleLatches) {
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const char *ModuleStr =
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"target datalayout = \"e-m:o-i64:64-f80:128-n8:16:32:64-S128\"\n"
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"define void @foo(i32 %n) {\n"
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"entry:\n"
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" br i1 undef, label %for.cond, label %for.end\n"
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"for.cond:\n"
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" %i.0 = phi i32 [ 0, %entry ], [ %inc, %latch.1 ], [ %inc, %latch.2 ]\n"
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" %inc = add nsw i32 %i.0, 1\n"
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" %cmp = icmp slt i32 %i.0, %n\n"
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" br i1 %cmp, label %latch.1, label %for.end\n"
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"latch.1:\n"
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" br i1 undef, label %for.cond, label %latch.2, !llvm.loop !0\n"
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"latch.2:\n"
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" br label %for.cond, !llvm.loop !0\n"
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"for.end:\n"
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" ret void\n"
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"}\n"
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"!0 = distinct !{!0, !1}\n"
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"!1 = !{!\"llvm.loop.distribute.enable\", i1 true}\n";
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// Parse the module.
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LLVMContext Context;
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std::unique_ptr<Module> M = makeLLVMModule(Context, ModuleStr);
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runWithLoopInfo(*M, "foo", [&](Function &F, LoopInfo &LI) {
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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.cond");
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Loop *L = LI.getLoopFor(Header);
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EXPECT_NE(L, nullptr);
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// This loop is not in simplified form.
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EXPECT_FALSE(L->isLoopSimplifyForm());
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// Try to get and set the metadata id for the loop.
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MDNode *OldLoopID = L->getLoopID();
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EXPECT_NE(OldLoopID, nullptr);
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MDNode *NewLoopID = MDNode::get(Context, {nullptr});
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// Set operand 0 to refer to the loop id itself.
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NewLoopID->replaceOperandWith(0, NewLoopID);
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L->setLoopID(NewLoopID);
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EXPECT_EQ(L->getLoopID(), NewLoopID);
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EXPECT_NE(L->getLoopID(), OldLoopID);
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L->setLoopID(OldLoopID);
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EXPECT_EQ(L->getLoopID(), OldLoopID);
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EXPECT_NE(L->getLoopID(), NewLoopID);
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});
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}
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TEST(LoopInfoTest, PreorderTraversals) {
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const char *ModuleStr = "define void @f() {\n"
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"entry:\n"
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" br label %loop.0\n"
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"loop.0:\n"
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" br i1 undef, label %loop.0.0, label %loop.1\n"
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"loop.0.0:\n"
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" br i1 undef, label %loop.0.0, label %loop.0.1\n"
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"loop.0.1:\n"
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" br i1 undef, label %loop.0.1, label %loop.0.2\n"
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"loop.0.2:\n"
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" br i1 undef, label %loop.0.2, label %loop.0\n"
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"loop.1:\n"
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" br i1 undef, label %loop.1.0, label %end\n"
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"loop.1.0:\n"
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" br i1 undef, label %loop.1.0, label %loop.1.1\n"
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"loop.1.1:\n"
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" br i1 undef, label %loop.1.1, label %loop.1.2\n"
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"loop.1.2:\n"
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" br i1 undef, label %loop.1.2, label %loop.1\n"
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"end:\n"
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" ret void\n"
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"}\n";
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// Parse the module.
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LLVMContext Context;
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std::unique_ptr<Module> M = makeLLVMModule(Context, ModuleStr);
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Function &F = *M->begin();
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DominatorTree DT(F);
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LoopInfo LI;
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LI.analyze(DT);
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Function::iterator I = F.begin();
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ASSERT_EQ("entry", I->getName());
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++I;
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Loop &L_0 = *LI.getLoopFor(&*I++);
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ASSERT_EQ("loop.0", L_0.getHeader()->getName());
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Loop &L_0_0 = *LI.getLoopFor(&*I++);
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ASSERT_EQ("loop.0.0", L_0_0.getHeader()->getName());
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Loop &L_0_1 = *LI.getLoopFor(&*I++);
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ASSERT_EQ("loop.0.1", L_0_1.getHeader()->getName());
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Loop &L_0_2 = *LI.getLoopFor(&*I++);
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ASSERT_EQ("loop.0.2", L_0_2.getHeader()->getName());
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Loop &L_1 = *LI.getLoopFor(&*I++);
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ASSERT_EQ("loop.1", L_1.getHeader()->getName());
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Loop &L_1_0 = *LI.getLoopFor(&*I++);
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ASSERT_EQ("loop.1.0", L_1_0.getHeader()->getName());
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Loop &L_1_1 = *LI.getLoopFor(&*I++);
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ASSERT_EQ("loop.1.1", L_1_1.getHeader()->getName());
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Loop &L_1_2 = *LI.getLoopFor(&*I++);
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ASSERT_EQ("loop.1.2", L_1_2.getHeader()->getName());
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auto Preorder = LI.getLoopsInPreorder();
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ASSERT_EQ(8u, Preorder.size());
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EXPECT_EQ(&L_0, Preorder[0]);
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EXPECT_EQ(&L_0_0, Preorder[1]);
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EXPECT_EQ(&L_0_1, Preorder[2]);
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EXPECT_EQ(&L_0_2, Preorder[3]);
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EXPECT_EQ(&L_1, Preorder[4]);
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EXPECT_EQ(&L_1_0, Preorder[5]);
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EXPECT_EQ(&L_1_1, Preorder[6]);
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EXPECT_EQ(&L_1_2, Preorder[7]);
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auto ReverseSiblingPreorder = LI.getLoopsInReverseSiblingPreorder();
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ASSERT_EQ(8u, ReverseSiblingPreorder.size());
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EXPECT_EQ(&L_1, ReverseSiblingPreorder[0]);
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EXPECT_EQ(&L_1_2, ReverseSiblingPreorder[1]);
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EXPECT_EQ(&L_1_1, ReverseSiblingPreorder[2]);
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EXPECT_EQ(&L_1_0, ReverseSiblingPreorder[3]);
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EXPECT_EQ(&L_0, ReverseSiblingPreorder[4]);
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EXPECT_EQ(&L_0_2, ReverseSiblingPreorder[5]);
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EXPECT_EQ(&L_0_1, ReverseSiblingPreorder[6]);
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EXPECT_EQ(&L_0_0, ReverseSiblingPreorder[7]);
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}
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